US2730890A - Stroboscopic apparatus for calibrating time indicating devices - Google Patents

Stroboscopic apparatus for calibrating time indicating devices Download PDF

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US2730890A
US2730890A US280486A US28048652A US2730890A US 2730890 A US2730890 A US 2730890A US 280486 A US280486 A US 280486A US 28048652 A US28048652 A US 28048652A US 2730890 A US2730890 A US 2730890A
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resilient member
oscillating
circuit
contactor
flash lamp
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Joseph M Weinberger
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D7/00—Measuring, counting, calibrating, testing or regulating apparatus
    • G04D7/12—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard
    • G04D7/1257—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard wherein further adjustment devices are present
    • G04D7/1264—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard wherein further adjustment devices are present for complete clockworks

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  • This invention relates to apparatus for calibrating pre cision instruments, and more particularly to calibrating timing instruments such as clocks and watches.
  • An object of this invention is to provide apparatus of the above mentioned character by means of which the oscillating parts of a watch or clock to be calibrated are stroboscopically compared with similar parts of a standard watch or clock.
  • Another object of this invention is to provide apparatus which compares these oscillating parts by direct observation of the instrument to be calibrated.
  • a further object of this invention is to provide apparatus whereby the instrument to be calibrated may be regulated while being intermittently illuminated and observed without resorting to phase-shifters and the like.
  • a further object is to provide apparatus for calibrating clocks and watches of an inherent accuracy comparable to the accuracy of the instrument to be calibrated, without utilizing any external controlling apparatus.
  • a still further object is to provide apparatus for intermittent views of substantially short duration of alternate half-cycles of oscillation of the observed oscillating member of the instrument to be calibrated to eliminate the ambiguous criteria due to apparent displacement of the stroboscopically produced images during successive halfoscillations.
  • a feature of this invention resides in the manner of intermittently illuminating the oscillating member of the instrument to be calibrated.
  • a further feature of this invention resides in the manner of spacing the intervals of intermittent illumination.
  • a still further feature of this invention resides in the manner of avoiding completion of the triggering circuit during alternate half-oscillations of the standard oscillating member.
  • Fig. l is a diagrammatic view of the mechanical and electrical portions of an embodiment of this invention.
  • Fig. 2 is a cross sectional view of the oscillating mechanism and a diagrammatic View of the contacting mechanism, 60
  • Fig. 3 is an enlarged View of the deflecting wedge showing the positions of the resilient member during each half-cycle of oscillation
  • Fig. 4 is a schematic view of a circuit adapted to produce intermittent illumination of substantially short duration.
  • the present invention provides a device of positive operation wherein the error is observed directly without any ambiguous criteria and immediately corrected while the timepiece is being observed in the device, thus resulting in rapid calibration of the observed instrument.
  • This invention provides a device of such accuracy by utilizing the inherent, self-controlled accuracy of an oscillating system, such as a balance wheel of a watch or clock, without resorting to expensive and cumbersome controlling devices and which may be manufactured at substantially small cost.
  • this invention in its simplest embodiment, comprises an oscillating balance wheel 1, having a hairspring 2, a roller 3 and a deflecting wedge 4 which is maintained in oscillatory motion by a mainspring and barrel 5, a gear train 6 and an escapement 7.
  • a pillar plate 8 and bridge 9 support the balance wheel assembly.
  • the hairspring 2 is attached at one or" its ends to the staff ill of the balance wheel 1 and, at its other end, to the bridge and is regulated by means of a pair of regulator pins iii which restrain the motion of the hairspring.
  • the deflecting wedge is attached to the roller 3 and subtends a substantially small angle from the axis of rotation of the balance wheel 1'.
  • connection 14- Electrical contact is made with the pillar plate 8 by means of connection 14- and with the contactor member 13 by means of connection 15.
  • the source of intermittent illumination shown in this embodiment is an internally triggered, cold cathode, inert-gas-filled electronic flash lamp 16 which is energized by means of an electronic circuit 17.
  • This circuit is de scribed more particularly hereinbelow.
  • connections 14 and 15, and the members 4, 12 and 13, comprise the triggering mechanism which sets ofi the action of the flash lamp 16 and provides the intermittent illumination which is directed toward the oscillating member 25 of an instrument to be calibrated.
  • the mainsprnig 5 is wound up and the balance wheel 1 is caused thereby to be rotated about its axis by means or" the escapement 7, carrying along with it the deflecting wedge 4, which engages and deflects the resilient member 12 at substantially the time during which the balance wheel l is receiving its impulse from the escapement 7', thus insuring a minimum of interference with the motion of the balance wheel and promoting greater accuracy of the device.
  • the deflecting wedge 4 When the balance wheel 1 is rotating in one direction (i. e., in Fig. 3 shown as counter-clockwise) the deflecting wedge 4 causes the resilient member 12 to assume the position 12a and to deflect toward the contactor member 13, briefly completing the electrical contact from the connection 14, through the pillar plate 8, the bridge 9, the hair-spring 2, the deflecting wedge 4, the resilient member 22, the contactor member 13 and to connection 15, thus triggering a flash of intermittent illumination of the flash lamp 16, by means of the electronic circuit 17. As the balance wheel 1 rotates farther, the deflecting wedge 4 releases the resilient member 12, breaking the electrical contact and insuring against any spurious and undesired flashes.
  • the deflecting wedge 4 causes the resilient member 12'; to assume position 12b and to deflect away from the contactor member 13, and no elec trical contact is made.
  • the deflecting wedge 4 engages the resilient member 12 at a time when the balance wheel 1 is moving at its greatest angular speed. in this manner, the duration of contact is extremely short and the instant of flash is accurately determined. This obviates the possibility of spurious flashes which would make a device of this kind diflicult, if not impossible, to use as an accurate calibrating device.
  • the electrical circuit is completed during alter nate half-cycles of oscillation of the balance wheel 1, when it is rotating in a counter-clockwise direction.
  • an electronic circuit which comprises a voltage doubler circuit having rectifiers l8 and condensers i9, charging circuit having a condenser 20, a resistor 26 and a voltage divider 21, an internally triggercd, cold cathode, inert-gas-fllled flash lamp 16 and a triggering circuit having resistors 22 and 23 and condenser 24.
  • Connections 14 an are connected respectively to the pillar plate 8 and the contactor member 13 as hereinbefore described.
  • the flash lamp 16 flashes at a rate determined by the period of oscillation of the balance wheel 1 and intermittently illuminates the oscillating member 25 of an instrument to be calibrated, which is viewed directly or through an optical system 27.
  • a set of indicating hands moving at different speeds may be attached to the gear train to check the accuracy of the standard instrument on a calibrated dial 29 by observing the positions of the said hands and comparing them with another timepiece.
  • the escapement 7 and the oscillating assembly may be driven directly by a mainspring or other source of rotary power without the use of intermediate gears.
  • the deflecting wedge 4 may be attached to any part of the balance Wheel assembly or may be made integral therewith. I
  • An apparatus for calibrating time indicating devices comprising an oscillating member, a flash lamp for intermittently illuminating an instrument to be calibrated, a circuit for momentarily energizing said flash lamp, a defleeting wedge electrically connected to and moving with said oscillating member and comprising one leg of a trigger circuit of said flash lamp energizing circuit, a resilient member adjacent said oscillating member, and a contactor member adjacent said resilient member and comprising the other leg of said trigger circuit; said resilient member and said contactor member normally forming part of an open circuit; said deflecting wedge positioned to engage said resilient member in substantially a period of maximum angular speed of said oscillating member and adapted to deflect said resilient member away from said contactor member during one half-cycle and to deflect said resilient member to momentarily touch said contactor member during a predetermined angular displacement of said oscillating member in the other halfcycle of oscillation of said oscillating member to close the said trigger circuit in response to said alternate halfcycles of oscillation and to
  • An apparatus for calibrating time indicating devices comprising an oscillating member, spring means for storing power to impart oscillatory motion thereto, a flash lamp for intermittently illuminating an instrument to be calibrated, a circuit for momentarily energizing said flash lamp, a deflecting wedge electrically connected to and moving at the same speed as said oscillating member and comprising one leg of a trigger circuit of said flash lamp energizing circuit, a resilient member adjacent said oscillating member, and a contactor member adjacent said resilient member and comprising the other leg of said trigger circuit; said resilient member and said contactor member normally forming part of an open circuit; said deflecting wedge disposed to engage said resilient member in substantially a period of maximum angular speed of said oscillating member and adapted to deflect said resilient member to touch said contactor member during a predetermined angular displacement of said oscillating member in alternate half-cycles of oscillations of said oscillating member and close the said trigger circuit in response to said alternate half-cycles of oscillation and to dis
  • An apparatus for calibrating time indicating devices comprising an oscillating member, spring means for storing power to impart oscillatory motion thereto, speed reducing means and escapement means to cooperate with said oscillating member to impart oscillatory motion thereto, a flash lamp for intermittently illuminating an instrument to be calibrated, a circuit for momentarily energizing said flash lamp, a deflecting wedge electrically connected to and moving with the same speed as said oscillating member and comprising one leg of a trigger circuit of said flash lamp energizing circuit, a resilient member adjacent said oscillating member, and a contactor member adjacent said resilient member and comprising the other leg of said trigger circuit; said resilient member and said contactor member normally forming part of an open circuit; said deflecting wedge disposed to engage said resilient member in substantially a period of maximum angular speed of said oscillating member and adapted to deflect said resilient member to touch said contactor member during a predetermined angular displacement of said oscillating member in alternate haltcycles of oscillation of said oscil
  • an oscillating member a deflecting wedge attached and electrically connected thereto and comprising one leg of a trigger circuit of a flash lamp energizing circuit, a resilient member adjacent said oscillating member, and a contactor member adjacent said resilient member and comprising the other leg of said trigger circuit; said resilient member and said contactor member normally forming part of an open circuit; said deflecting wedge disposed to engage said resilient member in a period of substantially maximum angular speed of said oscillating member and adapted to deflect said resilient member away from said contactor member during one halfcycle and to deflect said resilient member to momentarily touch said contactor member during a predetermined angular displacement of said oscillating member in the other half-cycle of oscillation of said oscillating member to complete the said trigger circuit from said oscillating member through said wedge, said resilient member and said contactor member to trigger said flash lamp energizing circuit and momentarily illuminate an instrument to be calibrated in response to said alternate halfcycles of oscillation and to
  • an oscillating member in an apparatus for calibrating time indicating devices, an oscillating member, spring means for storing power to impart oscillatory motion thereto, a deflecting wedge attached and electrically connected to said oscillating member and comprising one leg of a trigger circuit of a flash lamp energizing circuit, a resilient member adjacent said oscillating member, and a contactor member adjacent said resilient member and comprising the other leg of said trigger circuit; said resilient member and said contactor member normally forming part of an open circuit; said deflecting wedge disposed to engage said resilient member in a period of maximum angular speed.

Description

Jan. 17, 1956 M. WEINBERGER 2,730,890 CALIBRATING J. STROBOSCOPIC APPARATUS FOR TIME INDICATIN EVICES Filed April 1952 United States Patent 6 i 2,730,890 Patented Jan. 17, 1956 ice These methods have proven inadequate in that these devices were inherently inaccurate, diflicult to control and STROBOSCOPIC APPARATUS FOR CALIBRATING TIME INDICATENG DEVICES Joseph M. Weinberger, Brooklyn, N. 1.
Application April 4, 1952, Serial No. 280,486
5 Claims. (Cl. 73-6) and cumbersome operation.
This invention relates to apparatus for calibrating pre cision instruments, and more particularly to calibrating timing instruments such as clocks and watches.
An object of this invention is to provide apparatus of the above mentioned character by means of which the oscillating parts of a watch or clock to be calibrated are stroboscopically compared with similar parts of a standard watch or clock.
Another object of this invention is to provide apparatus which compares these oscillating parts by direct observation of the instrument to be calibrated.
A further object of this invention is to provide apparatus whereby the instrument to be calibrated may be regulated while being intermittently illuminated and observed without resorting to phase-shifters and the like.
A further object is to provide apparatus for calibrating clocks and watches of an inherent accuracy comparable to the accuracy of the instrument to be calibrated, without utilizing any external controlling apparatus.
A still further object is to provide apparatus for intermittent views of substantially short duration of alternate half-cycles of oscillation of the observed oscillating member of the instrument to be calibrated to eliminate the ambiguous criteria due to apparent displacement of the stroboscopically produced images during successive halfoscillations.
A feature of this invention resides in the manner of intermittently illuminating the oscillating member of the instrument to be calibrated.
A further feature of this invention resides in the manner of spacing the intervals of intermittent illumination.
A still further feature of this invention resides in the manner of avoiding completion of the triggering circuit during alternate half-oscillations of the standard oscillating member.
Other objects and features will become apparent from the following descriptions and the accompanying drawing in which like numerals indicate similar parts, and in which:
Fig. l is a diagrammatic view of the mechanical and electrical portions of an embodiment of this invention,
Fig. 2 is a cross sectional view of the oscillating mechanism and a diagrammatic View of the contacting mechanism, 60
Fig. 3 is an enlarged View of the deflecting wedge showing the positions of the resilient member during each half-cycle of oscillation, and
Fig. 4 is a schematic view of a circuit adapted to produce intermittent illumination of substantially short duration.
The former practice in watch or clock calibration has been to illuminate the oscillating parts of these instruments by means of flashing lights controlled by means of electronic or rotating mechanical equipment, and the error determined by means of external devices such as phase-shifters and the like.
The present invention provides a device of positive operation wherein the error is observed directly without any ambiguous criteria and immediately corrected while the timepiece is being observed in the device, thus resulting in rapid calibration of the observed instrument.
To properly calibrate a watch or clock of precise manufacture, requires a standard of equal or higher accuracy against which it can be compared.
This invention provides a device of such accuracy by utilizing the inherent, self-controlled accuracy of an oscillating system, such as a balance wheel of a watch or clock, without resorting to expensive and cumbersome controlling devices and which may be manufactured at substantially small cost.
in its simplest embodiment, this invention comprises an oscillating balance wheel 1, having a hairspring 2, a roller 3 and a deflecting wedge 4 which is maintained in oscillatory motion by a mainspring and barrel 5, a gear train 6 and an escapement 7. A pillar plate 8 and bridge 9 support the balance wheel assembly.
The hairspring 2 is attached at one or" its ends to the staff ill of the balance wheel 1 and, at its other end, to the bridge and is regulated by means of a pair of regulator pins iii which restrain the motion of the hairspring.
The deflecting wedge is attached to the roller 3 and subtends a substantially small angle from the axis of rotation of the balance wheel 1'.
Attached to the pillar plate 8 and electrically insulated therefrom by means of an insulator block 28 is a resilient member 12 and a contactor member 13, also electrically insulated from the pillar plate 8 and from the resilient member 12.
Electrical contact is made with the pillar plate 8 by means of connection 14- and with the contactor member 13 by means of connection 15.
The source of intermittent illumination shown in this embodiment is an internally triggered, cold cathode, inert-gas-filled electronic flash lamp 16 which is energized by means of an electronic circuit 17. This circuit is de scribed more particularly hereinbelow.
The connections 14 and 15, and the members 4, 12 and 13, comprise the triggering mechanism which sets ofi the action of the flash lamp 16 and provides the intermittent illumination which is directed toward the oscillating member 25 of an instrument to be calibrated.
The mainsprnig 5 is wound up and the balance wheel 1 is caused thereby to be rotated about its axis by means or" the escapement 7, carrying along with it the deflecting wedge 4, which engages and deflects the resilient member 12 at substantially the time during which the balance wheel l is receiving its impulse from the escapement 7', thus insuring a minimum of interference with the motion of the balance wheel and promoting greater accuracy of the device.
When the balance wheel 1 is rotating in one direction (i. e., in Fig. 3 shown as counter-clockwise) the deflecting wedge 4 causes the resilient member 12 to assume the position 12a and to deflect toward the contactor member 13, briefly completing the electrical contact from the connection 14, through the pillar plate 8, the bridge 9, the hair-spring 2, the deflecting wedge 4, the resilient member 22, the contactor member 13 and to connection 15, thus triggering a flash of intermittent illumination of the flash lamp 16, by means of the electronic circuit 17. As the balance wheel 1 rotates farther, the deflecting wedge 4 releases the resilient member 12, breaking the electrical contact and insuring against any spurious and undesired flashes.
When the balance wheel 1 is rotating in the opposite direction (i. e., clockwise), the deflecting wedge 4 causes the resilient member 12'; to assume position 12b and to deflect away from the contactor member 13, and no elec trical contact is made.
it is to be noted that the deflecting wedge 4 engages the resilient member 12 at a time when the balance wheel 1 is moving at its greatest angular speed. in this manner, the duration of contact is extremely short and the instant of flash is accurately determined. This obviates the possibility of spurious flashes which would make a device of this kind diflicult, if not impossible, to use as an accurate calibrating device.
Thus, the electrical circuit is completed during alter nate half-cycles of oscillation of the balance wheel 1, when it is rotating in a counter-clockwise direction.
in 4, an electronic circuit is shown which comprises a voltage doubler circuit having rectifiers l8 and condensers i9, charging circuit having a condenser 20, a resistor 26 and a voltage divider 21, an internally triggercd, cold cathode, inert-gas-fllled flash lamp 16 and a triggering circuit having resistors 22 and 23 and condenser 24. Connections 14 an are connected respectively to the pillar plate 8 and the contactor member 13 as hereinbefore described.
The flash lamp 16 flashes at a rate determined by the period of oscillation of the balance wheel 1 and intermittently illuminates the oscillating member 25 of an instrument to be calibrated, which is viewed directly or through an optical system 27.
When the oscillating member 25 is synchronized with the balance wheel 1, it will appear to remain substantially stationary, while being observed under the intermittent illumination of the flash lamp 16. An apparent rotation of the oscillating member 25 in either direction indicates an out of synchronism condition which is rapidly corrected by means of the regulator provided in the instrument to be calibrated, which is adjusted until the apparent rotation has stopped.
Many mechanical faults of the instrument to be calibrated can be diagnosed by observing the characteristics of the apparent rotation of the oscillating member 25.
A set of indicating hands moving at different speeds may be attached to the gear train to check the accuracy of the standard instrument on a calibrated dial 29 by observing the positions of the said hands and comparing them with another timepiece.
in other embodiments of this invention, the escapement 7 and the oscillating assembly may be driven directly by a mainspring or other source of rotary power without the use of intermediate gears.
The deflecting wedge 4 may be attached to any part of the balance Wheel assembly or may be made integral therewith. I
I wish it distinctly understood that, while I have particularly described the simplest elements adapted to perform the functions set forth, it is obvious that they could be subject to modifications, and various changes in form, proportion and in minor details of construction may be resorted to without departing from the spirit or sacrificing any of the principles of the invention.
What I claim is:
1. An apparatus for calibrating time indicating devices comprising an oscillating member, a flash lamp for intermittently illuminating an instrument to be calibrated, a circuit for momentarily energizing said flash lamp, a defleeting wedge electrically connected to and moving with said oscillating member and comprising one leg of a trigger circuit of said flash lamp energizing circuit, a resilient member adjacent said oscillating member, and a contactor member adjacent said resilient member and comprising the other leg of said trigger circuit; said resilient member and said contactor member normally forming part of an open circuit; said deflecting wedge positioned to engage said resilient member in substantially a period of maximum angular speed of said oscillating member and adapted to deflect said resilient member away from said contactor member during one half-cycle and to deflect said resilient member to momentarily touch said contactor member during a predetermined angular displacement of said oscillating member in the other halfcycle of oscillation of said oscillating member to close the said trigger circuit in response to said alternate halfcycles of oscillation and to disengage said resilient member after said predetermined angular displacement to break electrical contact between said wedge and said resilient member before electrical contact is broken between said resilient member and said contactor member.
2. An apparatus for calibrating time indicating devices comprising an oscillating member, spring means for storing power to impart oscillatory motion thereto, a flash lamp for intermittently illuminating an instrument to be calibrated, a circuit for momentarily energizing said flash lamp, a deflecting wedge electrically connected to and moving at the same speed as said oscillating member and comprising one leg of a trigger circuit of said flash lamp energizing circuit, a resilient member adjacent said oscillating member, and a contactor member adjacent said resilient member and comprising the other leg of said trigger circuit; said resilient member and said contactor member normally forming part of an open circuit; said deflecting wedge disposed to engage said resilient member in substantially a period of maximum angular speed of said oscillating member and adapted to deflect said resilient member to touch said contactor member during a predetermined angular displacement of said oscillating member in alternate half-cycles of oscillations of said oscillating member and close the said trigger circuit in response to said alternate half-cycles of oscillation and to dis engage said resilient member after said predetermined angular displacement to break electrical contact between said wedge and said resilient member before electrical contact is broken between said resilient member and said contactor member.
3. An apparatus for calibrating time indicating devices comprising an oscillating member, spring means for storing power to impart oscillatory motion thereto, speed reducing means and escapement means to cooperate with said oscillating member to impart oscillatory motion thereto, a flash lamp for intermittently illuminating an instrument to be calibrated, a circuit for momentarily energizing said flash lamp, a deflecting wedge electrically connected to and moving with the same speed as said oscillating member and comprising one leg of a trigger circuit of said flash lamp energizing circuit, a resilient member adjacent said oscillating member, and a contactor member adjacent said resilient member and comprising the other leg of said trigger circuit; said resilient member and said contactor member normally forming part of an open circuit; said deflecting wedge disposed to engage said resilient member in substantially a period of maximum angular speed of said oscillating member and adapted to deflect said resilient member to touch said contactor member during a predetermined angular displacement of said oscillating member in alternate haltcycles of oscillation of said oscillating member and close the trigger circuit of said flash lamp energizing circuit in response to said alternate half-cycles of oscillation and to disengage said resilient member after said angular dis placement to break electrical contact between said wedge and said resilient member before electrical contact in broken between said resilient member and said contactor member.
4. In an apparatus for calibrating time indicating devices, an oscillating member, a deflecting wedge attached and electrically connected thereto and comprising one leg of a trigger circuit of a flash lamp energizing circuit, a resilient member adjacent said oscillating member, and a contactor member adjacent said resilient member and comprising the other leg of said trigger circuit; said resilient member and said contactor member normally forming part of an open circuit; said deflecting wedge disposed to engage said resilient member in a period of substantially maximum angular speed of said oscillating member and adapted to deflect said resilient member away from said contactor member during one halfcycle and to deflect said resilient member to momentarily touch said contactor member during a predetermined angular displacement of said oscillating member in the other half-cycle of oscillation of said oscillating member to complete the said trigger circuit from said oscillating member through said wedge, said resilient member and said contactor member to trigger said flash lamp energizing circuit and momentarily illuminate an instrument to be calibrated in response to said alternate halfcycles of oscillation and to break the electrical circuit between said wedge and said resilient member after said predetermined angular displacement of said oscillating member before electrical contact is broken between said resilient member and said contactor member.
5. In an apparatus for calibrating time indicating devices, an oscillating member, spring means for storing power to impart oscillatory motion thereto, a deflecting wedge attached and electrically connected to said oscillating member and comprising one leg of a trigger circuit of a flash lamp energizing circuit, a resilient member adjacent said oscillating member, and a contactor member adjacent said resilient member and comprising the other leg of said trigger circuit; said resilient member and said contactor member normally forming part of an open circuit; said deflecting wedge disposed to engage said resilient member in a period of maximum angular speed. of said oscillating member and adapted to deflect said resilient member to momentarily touch said contactor member during a predetermined angular displacement of said oscillating member in alternate half-cycles of 05 cillation of said oscillating member and close a trigger circuit of a flash lamp energizing circuit from said oscillating member through said wedge, said resilient member and said contactor member and momentarily illuminate an instrument to be calibrated in response to said alternate half-cycles of oscillation and to break the electrical circuit between said wedge and said resilient member after said predetermined angular displacement of said oscillating member before electrical contact is broken between said resilient member and said contactor member.
References Cited in the file of this patent UNITED STATES PATENTS 2,037,161 Fetter et al Apr. 14, 1936 2,108,010 Delviniotti Feb. 8, 1938 2,143,074 Killrnan et al. Jan. 10, 1939 2,183,655 Morton Dec. 19, 1939 2,444,178 Weinberger June 29, 1948 2,454,983 Weinberger Nov. 30, 1948 2,587,452 Farris Feb. 26, 1952
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2037161A (en) * 1933-06-01 1936-04-14 Electrical Res Prod Inc Apparatus for the optical calibration of timepieces
US2108010A (en) * 1933-09-05 1938-02-08 Delviniotti Jean Clockwork system
US2143074A (en) * 1932-09-09 1939-01-10 Dazey Churn & Mfg Co Timing device
US2183655A (en) * 1936-05-07 1939-12-19 Bell Telephone Labor Inc Means for adjusting vibrating systems
US2444178A (en) * 1945-11-02 1948-06-29 Tessie Weinberger Stroboscopic apparatus for calibrating time indicating devices
US2454983A (en) * 1944-10-27 1948-11-30 Tessie Weinberger Stroboscopic apparatus for calibrating time indicating devices
US2587452A (en) * 1947-12-01 1952-02-26 Farris Clarence Earl Watch timing device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2143074A (en) * 1932-09-09 1939-01-10 Dazey Churn & Mfg Co Timing device
US2037161A (en) * 1933-06-01 1936-04-14 Electrical Res Prod Inc Apparatus for the optical calibration of timepieces
US2108010A (en) * 1933-09-05 1938-02-08 Delviniotti Jean Clockwork system
US2183655A (en) * 1936-05-07 1939-12-19 Bell Telephone Labor Inc Means for adjusting vibrating systems
US2454983A (en) * 1944-10-27 1948-11-30 Tessie Weinberger Stroboscopic apparatus for calibrating time indicating devices
US2444178A (en) * 1945-11-02 1948-06-29 Tessie Weinberger Stroboscopic apparatus for calibrating time indicating devices
US2587452A (en) * 1947-12-01 1952-02-26 Farris Clarence Earl Watch timing device

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