US2150502A - Measuring, indicating, and recording instrument - Google Patents

Measuring, indicating, and recording instrument Download PDF

Info

Publication number
US2150502A
US2150502A US546290A US54629031A US2150502A US 2150502 A US2150502 A US 2150502A US 546290 A US546290 A US 546290A US 54629031 A US54629031 A US 54629031A US 2150502 A US2150502 A US 2150502A
Authority
US
United States
Prior art keywords
measuring
resistor
indicating
galvanometer
recording instrument
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US546290A
Inventor
Thomas R Harrison
Ernest H Grauel
Kessler John Ernest
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brown Instruments Co
Original Assignee
Brown Instr Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brown Instr Co filed Critical Brown Instr Co
Priority to US546290A priority Critical patent/US2150502A/en
Priority to US722466A priority patent/US2122370A/en
Priority to US727630A priority patent/US2058078A/en
Priority to US109124A priority patent/US2132617A/en
Application granted granted Critical
Publication of US2150502A publication Critical patent/US2150502A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/04—Arrangements for displaying electric variables or waveforms for producing permanent records
    • G01R13/08—Electromechanical recording systems using a mechanical direct-writing method
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
    • G01R17/02—Arrangements in which the value to be measured is automatically compared with a reference value
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/24—Adjustable resistors the contact moving along turns of a helical resistive element, or vica versa
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y10T74/1828—Cam, lever, and slide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19642—Directly cooperating gears
    • Y10T74/19647—Parallel axes or shafts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2133—Pawls and ratchets
    • Y10T74/2136—Pivoted pawls
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/22—Miscellaneous

Definitions

  • This invention relates to measuring instruments and more especially to improvements in potentiometric measuring and recording instruments.
  • Potentiometers of the automatic balancing type are well known and have been available in commercial form for many years. Such potentiometers, while affording a more or less satisfactory service and being of a design and construction adapted for a more or less satisfactory facility and cost of manufacture, fall short of the most desirable form and construction of potentiometer, both from the standpoint of operation and service, and facility and cost of construction and maintenance.
  • This invention comprises improvements in the galvanometer construction affording a simpler and less expensive mode of manufacture, provid ing a simpler galvanometer assembly having a maximum of accessibility for adjustment and service and a minimum of constructional features subject to failure in operation.
  • This invention also includes the provision of an improved form of mechanism for automatically balancing the potentiometric circuit adapted to simplify practice in manufacture, to increase efficiency and smoothness of operation, and to provide greater independence of failure in operation.
  • the invention also comprises the provision for indicating and/or recording thevalue of the quantity measured by the potentiometer system, which is a simplified construction and an improvement in efliciency of operation.
  • the invention also includes improvements in case construction for containing the potentiometer mechanism, and improvements in standard cell construction and mounting. This invention provides such improved forms of construction of parts and assembly thereof, as permits the extensive use of sheet metal stamping and parts molded from heat plastic materials so that'the formed parts may be combined into the complete potentiometer with a minimum of hand or machine operation.
  • Fig. 1 shows the front elevation of the potentiometer of this invention with parts broken away and in section.
  • Fig. 2 shows the top plan view of the instrul0 ment mechanism assembly with parts broken away and in section.
  • Fig. 3 shows a partial rear elevation with parts broken away and in section.
  • Fig. 4 shows, in perspective, the galvanometer l5 assembly with the parts separated for clearness.
  • Figs. 5 and 6 show in front and rear elevation respectively, the galvanometer unit.
  • Fig. 7 shows, in perspective, the molding which forms an element in the galvanometer assembly. 20
  • Figs. 8 and .9 show details, in top plan and perspective respectively, of the galvanometer zero adjusting mechanism.
  • Figs. 10 and 11 show detail views in perspective and in section, respectively, showing the galvanometer pointer and coil construction.
  • Fig. 12 is a perspective view of the galvanometer position gauging assembly.
  • Fig. 13 is a perspective view similar to Fig. 12, taken from another angle.
  • Fig. 14 is a detail view in elevation of the galvanometer position gauging assembly.
  • Figs. 15, 16, and 17 are perspective views of the parts which collectively make up the galvanometer position gauging assembly.
  • Fig. 18 is a cross sectional view of the slide wire unit and associated parts showing the assembled relation of the unit to the frame and standard cell.
  • Fig. 19 is a top plan view, partly broken away and in section, of the slide wire unit.
  • Fig. 20 is a view, inv front elevation, of the slide Wire assembly.
  • Fig. 21 is a detail view of the slide wire assembly.
  • Fig. 22 is a view in perspective showing the electrical connections for the slide wire unit.
  • Fig. 23 is a view in perspective of the operating parts of the potentiometer with the parts relatively displaced to show more clearly their operation.
  • Fig. 24 is a detail view of the secondary pointer.
  • Fig. 25 is a detail view of the chart drive IOll construction.
  • Fig. 26 is a view in end elevation of the potentiometer showing the drive mechanism for automatically operating the potentiometer.
  • Fig. 27 is a view in elevation similar to Fig. 26, but taken in the opposite direction.
  • Fig. 28 is a detail view of the mechanism for operating the chart drive roll.
  • Figs. 29, 30, 31, and 32 are views in perspective and elevation, illustrating the operating parts of the potentiometer drive mechanism at different stages of operation.
  • Fig. 33 is a sectional detail view showing the construction of the chart re-roll.
  • Fig. 34 is a detail view, partly in elevation and partly in section, showing the latch construction for securing the instrument in proper position within its casing.
  • Fig. 35 is a bottom plan view 01' the terminal box.
  • Fig. 36 is a top view, in perspective, of the terminal box showing parts in displaced position.
  • Fig. 3'7 is a detail in section showing the terminal mounting construction.
  • Fig. 38 is a view in side elevation broken away and showing operating parts for multiple recording.
  • Fig. 39 is a view similar to Fig. 38 showing the parts in a different stage of operation.
  • Fig. 40 is a view, in perspective, showing parts of the multiple recording mechanism.
  • Fig. 41 is a detail view, in section, showing the mounting for the ribbon bobbin.
  • Fig. 42 is a detail in perspective showing features of the humidity compensator.
  • Fig. 43 is a diagrammatic view of a potentiometer circuit adapted for use with the potentiometer of this invention.
  • potentiometer circuit Referring to Fig. 43, I designates a substantially constant source oi. electromotive force such as an ordinary dry cell connected in series with an adjustable resistor 2, the adjustment of which is adapted to vary the current flow in the circuit containing the cell I, a ballast resistor 3, a slide wire 4, another ballast resistor 5, a calibrating resistor 8, the value and manner of connection of which may be varied in order to vary the measuring range of the potentiometer circuit, completing the series of circuit.
  • a shunt circuit containing resistors I and 8, is provided.
  • the resistor I is included in the measuring circuit completed through resistor 9, galvanometer Ill, switch I I, switch contact I2, conductors I3 and I4, across which are connected a source of potential such as a thermocouple I5, the value of which is to be measured, conductor I6, resistor I! and sliding contact I8, tothe slide wire 4.
  • a source of potential such as a thermocouple I5
  • the variation in temperature of a cold junction may be automatically compensated for, as is well known in the art.
  • a resistor 8 is included inan auxiliary circuit extending from resistor 8 through resistor I9, standard cell 20, switch contact 2
  • a resistor 22' may be shunted about the galvanometer I0 in order to properly damp its movement when the switch II is thrown into engagement with the contact 2
  • the source of electromotive force I supplies a steady current through slide wire resistor 4, thereby creating a definite potential drop across that resistor.
  • the circuit including the thermocouple I5 applies an electromotive force on the slide wire 4 in a direction such as to oppose that created by the cell I.
  • By adjusting the sliding contact I8 along the resistor 4 a point on the resistor 4 is reached where the potential of the thermocouple applied to the resistor 4 is equal and opposite to the potential of the resistor 4 at that point.
  • the galvanometer I0 which is normally connected in circuit with the thermocouple I5 by virtue of a normally closed position of the switch I I, will have a zero deflection. Variations in the value of the electromotive force of the thermocouple cause deflection of the galvanometer In in a direction depending upon whether the variation is an increase or a decrease from that value for which the potentiometer system is previously balanced.
  • the contact I8 may be adjusted again to bring the galvanometer into a position which corresponds to a balanced condition of the measuring system.
  • the resistor I1 is connected in series in the thermocouple and galvanometer circuit in a manner such that additional resistance is added from resistor I1 when a like amount of resistance is eliminated from resistor 4 by movement of contact I8, thereby maintaining a constant electrical resistance in the thermocouple and galvanometer circuit so as to maintain an unvarying 'galvanometer constant throughout the measuring range of the potentiometer.
  • switch II is adjusted into engagement with com tacts 2
  • thermocouples I5 are illustrated, and a switch 23 diagrammatically illustrated by which any one of the thermo-

Description

March 1939- T. R. HARRISON ET AL 2,150,502
MEASURING, INDICATING, AND RECORDING INSTRUMENT Filed June 23, 1931 Q 18 Sheets-Sheet 1 a: INVENTORS. 711i.Hariizsuiz, (3' v. I JEIIessZer, N v BY Grauez, R4 Q %m March 14, 1939. T. R. HARRISON ET AL MEASURING, INDICATING, AND RECORDING INSTRUMENT Filed June 25, 1931 18 Sheets-Sheet 2 awn IN VEN TORS J E BY E. A
n 0 q m W m G W r March 14, 1939.
T. R. HARRISON Efr-AL' MEASURING, INDICATING, AND RECORDING INSTRUMENT Filed June 23, 1931 18 Sheets-Sheet s 5 m m m m TRHarrz'son .IEifessZe E.
I, 1121, fi 5.
March 1939. -r. R. HARRISON ET AL 2,150,502
MEASURING, INDICATING, AND RECORDING INSTRUMENT Filed June 23, 1931 18 Sheets-Sheet 4 IN V EN TORS 271?. H (11715012, J E11 6531 er,
BY 12E Z6 anal, Arfizy March 14, 1939. T R. HARRISON Er AL MEASURING, INDICATING, AND RECORDING INSTRUMENT l8 Sheets-Sheet 5 Filed June 23, 1931 INVENTQRS. TRHarrzson; JEKessZer, E 'Grauel Argmways.
March 14, 1939. T. R. HARRISON ET AL MEASURING, INDICATING, AND RECORDING INSTRUMENT Filed June 23, 1931 18 Sheets-Sheet 6 IN V EN TQRS. TRHarrzsan J iflssler.
March14, 1939. -r. R. HARRISON ET m.
MEASURING, INDIGATING, AND RECORDING INSTRUMENT Filed June 23, 1931 18 Sheets-Sheet 8 INVENTQRS. ZHJJarrzso/n, JEKessZer, Efi -G duel A ORN AH mNhN March 14, 1939. T. R. HARRISON ET AL MEASURING, INDICATING, AND RECORDING INSTRUMENT Filed June 25, 1931 18 She etSSheet 9 Fla/uni IN VENTQRS, 771?.Harrzs0 IE 11 888191 I N BY iir zzelE IQ i 5' AT RNEYS.
March 14, 1939. T. R HARRISON ET AL 2,150,502
MEASURING, mmcmme, AND RECORDING INSTRUMENT Filed June 23, 19251 18 Sheets-Sheet 10 FIG. 1111 51 @mmm\mmmlmmmw m A TT NEYS.
March 14, 1939. -r. R; HARRISON ET AL 5 MEASURING, INDICATING, AND RECORDING INSTRUMENT Filed June 23, 1931 '18 Sheets-Sheet 11 1 FIG 151m I6 32s wn Bumps. TRHarrzsozz,
BY E. Grams? 773 601 .47 RNEYS.
March 14, 1939. T. R, HARR ON ET'AL 2,150,502
MEASURING, INDICATING, AND RECORDING INSTRUMENT Filed June 23, l931 18 Sheets-Sheet l2 3" Flczlm IN VEN TQRS TRHarrzson JEII'ESsZen BY E. Gr ueZ March 14, 1939. T R, HARRISON ET AL 2,150,502
' MEASURING, INDICATING, AND RECORDING INSTRUMENT Filed June 23, 1931 18 Sheets-Sheet 13 FIG 1m.
454 W 4 7 g 9/ 453 457 4429 l MIN FIG AZL'WSZ- INVENTORS. ,IiiHai'rzson,
JEIfess-"Zer y EH- Grant; 0
A ORNEYS.
March 14, 1939 'r. R. HARRISON ETAL MEASURING, INDICATING, AND RECORDING INSTRUMENT Filed June 25, 1931 18 Sheets-Sheet 14 FIG. 3211/:
V INVENTORS,
TRHazrzser J11 12.5.6 A TT Kassie), razzel, $1M;-
March 14, 1939. T. R. HARRISON ET AL I MEASURING, INDICATING, AND RECORDING INSTRUMENT File'd June 23, 1951 18 Sheets-Sheet 15 March 14, 1939. T. R. HARRISON ETA].
MEASURING, INDICATING, AND RECORDING INSTRUMENT l8 Sheets-Sheet l6 INVENTORS. IITRHarrzsazz,
Filed June 23, 1931 March 14, 1939- T. R. HARRISON ET AL 2,150,502
MEASURING, INDICATING, AND RECORDING INSTRUMENT Filed June 25, 1931 18 Sheets-Sheet 1 March 14, 1939. T. R. HARRISON ET AL 0 MEASURING, INDICATING, AND RECORDING INSTRUMENT Filed June 23, 1931 18 Sheets-Sheet 18 IN V EN TORS. Tlifiarrzson,
Patented Mar. 14, 1939 UNITED STATES PATENT OFFICE MEASURING, INDICATING, AND RECORD- ING INSTRUMENT tion of Pennsylvania Application June 23, 1931, Serial No. 546,290
20 Claims.
This invention relates to measuring instruments and more especially to improvements in potentiometric measuring and recording instruments.
Potentiometers of the automatic balancing type are well known and have been available in commercial form for many years. Such potentiometers, while affording a more or less satisfactory service and being of a design and construction adapted for a more or less satisfactory facility and cost of manufacture, fall short of the most desirable form and construction of potentiometer, both from the standpoint of operation and service, and facility and cost of construction and maintenance.
It is the object of this invention to provide a measuring instrument of the potentiometer type involving numerous improvements in the individual parts which collectively make up the potentiometer, and also in the relative arrangement and efliciency of cooperation of the parts. This invention comprises improvements in the galvanometer construction affording a simpler and less expensive mode of manufacture, provid ing a simpler galvanometer assembly having a maximum of accessibility for adjustment and service and a minimum of constructional features subject to failure in operation. This invention also includes the provision of an improved form of mechanism for automatically balancing the potentiometric circuit adapted to simplify practice in manufacture, to increase efficiency and smoothness of operation, and to provide greater independence of failure in operation. The invention also comprises the provision for indicating and/or recording thevalue of the quantity measured by the potentiometer system, which is a simplified construction and an improvement in efliciency of operation. The invention also includes improvements in case construction for containing the potentiometer mechanism, and improvements in standard cell construction and mounting. This invention provides such improved forms of construction of parts and assembly thereof, as permits the extensive use of sheet metal stamping and parts molded from heat plastic materials so that'the formed parts may be combined into the complete potentiometer with a minimum of hand or machine operation. In'addition, such parts as the galvanometer assembly, the galvanometer position gauging assembly, and the slide wire assembly, have been made as separate units complete in themselves for mounting in a frame, and so constructed that when assembled interfit in operative relation, thus facilitating greatly the manufacture, assembly, and service of such an instrument. Other objects and advantages of. the invention appear in the detailed description which follows. 5
In the accompanying drawings,
Fig. 1 shows the front elevation of the potentiometer of this invention with parts broken away and in section.
Fig. 2 shows the top plan view of the instrul0 ment mechanism assembly with parts broken away and in section.
Fig. 3 shows a partial rear elevation with parts broken away and in section.
Fig. 4 shows, in perspective, the galvanometer l5 assembly with the parts separated for clearness.
Figs. 5 and 6 show in front and rear elevation respectively, the galvanometer unit.
Fig. 7 shows, in perspective, the molding which forms an element in the galvanometer assembly. 20
Figs. 8 and .9 show details, in top plan and perspective respectively, of the galvanometer zero adjusting mechanism.
Figs. 10 and 11 show detail views in perspective and in section, respectively, showing the galvanometer pointer and coil construction.
Fig. 12 is a perspective view of the galvanometer position gauging assembly.
Fig. 13 is a perspective view similar to Fig. 12, taken from another angle.
Fig. 14 is a detail view in elevation of the galvanometer position gauging assembly.
Figs. 15, 16, and 17 are perspective views of the parts which collectively make up the galvanometer position gauging assembly.
Fig. 18 is a cross sectional view of the slide wire unit and associated parts showing the assembled relation of the unit to the frame and standard cell.
Fig. 19 is a top plan view, partly broken away and in section, of the slide wire unit.
Fig. 20 is a view, inv front elevation, of the slide Wire assembly.
Fig. 21 is a detail view of the slide wire assembly.
Fig. 22 is a view in perspective showing the electrical connections for the slide wire unit.
Fig. 23 is a view in perspective of the operating parts of the potentiometer with the parts relatively displaced to show more clearly their operation.
Fig. 24 is a detail view of the secondary pointer.
Fig. 25 is a detail view of the chart drive IOll construction.
Fig. 26 is a view in end elevation of the potentiometer showing the drive mechanism for automatically operating the potentiometer.
Fig. 27 is a view in elevation similar to Fig. 26, but taken in the opposite direction.
Fig. 28 is a detail view of the mechanism for operating the chart drive roll.
Figs. 29, 30, 31, and 32 are views in perspective and elevation, illustrating the operating parts of the potentiometer drive mechanism at different stages of operation.
Fig. 33 is a sectional detail view showing the construction of the chart re-roll.
Fig. 34 is a detail view, partly in elevation and partly in section, showing the latch construction for securing the instrument in proper position within its casing.
Fig. 35 is a bottom plan view 01' the terminal box.
Fig. 36 is a top view, in perspective, of the terminal box showing parts in displaced position.
Fig. 3'7 is a detail in section showing the terminal mounting construction.
Fig. 38 is a view in side elevation broken away and showing operating parts for multiple recording.
Fig. 39 is a view similar to Fig. 38 showing the parts in a different stage of operation.
Fig. 40 is a view, in perspective, showing parts of the multiple recording mechanism.
Fig. 41 is a detail view, in section, showing the mounting for the ribbon bobbin.
Fig. 42 is a detail in perspective showing features of the humidity compensator.
Fig. 43 is a diagrammatic view of a potentiometer circuit adapted for use with the potentiometer of this invention.
potentiometer circuit Referring to Fig. 43, I designates a substantially constant source oi. electromotive force such as an ordinary dry cell connected in series with an adjustable resistor 2, the adjustment of which is adapted to vary the current flow in the circuit containing the cell I, a ballast resistor 3, a slide wire 4, another ballast resistor 5, a calibrating resistor 8, the value and manner of connection of which may be varied in order to vary the measuring range of the potentiometer circuit, completing the series of circuit. A shunt circuit containing resistors I and 8, is provided. The resistor I is included in the measuring circuit completed through resistor 9, galvanometer Ill, switch I I, switch contact I2, conductors I3 and I4, across which are connected a source of potential such as a thermocouple I5, the value of which is to be measured, conductor I6, resistor I! and sliding contact I8, tothe slide wire 4. By making the resistor 1 of a suitable temperature coefficient of electrical resistance, the variation in temperature of a cold junction may be automatically compensated for, as is well known in the art. A resistor 8 is included inan auxiliary circuit extending from resistor 8 through resistor I9, standard cell 20, switch contact 2|, switch II, galvanometer III, resistor 8, thus completing the circuit. A resistor 22' may be shunted about the galvanometer I0 in order to properly damp its movement when the switch II is thrown into engagement with the contact 2| and at the same time engages contact 22. In operation the source of electromotive force I supplies a steady current through slide wire resistor 4, thereby creating a definite potential drop across that resistor. The circuit including the thermocouple I5 applies an electromotive force on the slide wire 4 in a direction such as to oppose that created by the cell I. By adjusting the sliding contact I8 along the resistor 4, a point on the resistor 4 is reached where the potential of the thermocouple applied to the resistor 4 is equal and opposite to the potential of the resistor 4 at that point. At such time the galvanometer I0, which is normally connected in circuit with the thermocouple I5 by virtue of a normally closed position of the switch I I, will have a zero deflection. Variations in the value of the electromotive force of the thermocouple cause deflection of the galvanometer In in a direction depending upon whether the variation is an increase or a decrease from that value for which the potentiometer system is previously balanced. The contact I8 may be adjusted again to bring the galvanometer into a position which corresponds to a balanced condition of the measuring system. When the potentiometer circuit is unbalanced a current, due to the thermocouple, flows through the circuit including the resistor 4, and corresponding changes in the position of the .contact I8 to balance the circuit, thereby varies the amount of electrical resistance due to resistor 4 which is included in the thermocouple and galvanometercircuit tending to change the constant of the galvanometer circuit.
The resistor I1 is connected in series in the thermocouple and galvanometer circuit in a manner such that additional resistance is added from resistor I1 when a like amount of resistance is eliminated from resistor 4 by movement of contact I8, thereby maintaining a constant electrical resistance in the thermocouple and galvanometer circuit so as to maintain an unvarying 'galvanometer constant throughout the measuring range of the potentiometer.
Inasmuch as the cell I tends to deteriorate slightly with age and use, it is necessary from time to time to adjust the resistor 2 in order to maintain a predetermined current flowing through the slide wire resistor 4. For standardizing the current flowing in the slide wire resistor, switch II is adjusted into engagement with com tacts 2| and 22, thereby connecting the galvanometer ID in a circuit which. includes the standard cell 20 as a source of electromotive force arranged to oppose the potential drop across the resistor 8 due to the current flowing in the resistor 8 from the cell I. Variations from the standard in the current flowing through resistor 8 from the cell I, cause a deflection of the gal vanometer III from the position of zero deflection. The resistor 2 is then adjusted to bring the galvanometer to a position of zero deflection which corresponds to a balance between the potential shown as applied to the use of thermocouplesfor measuring temperature variation. As shown in Fig. 43, a plurality of thermocouples I5 are illustrated, and a switch 23 diagrammatically illustrated by which any one of the thermo-
US546290A 1931-06-23 1931-06-23 Measuring, indicating, and recording instrument Expired - Lifetime US2150502A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US546290A US2150502A (en) 1931-06-23 1931-06-23 Measuring, indicating, and recording instrument
US722466A US2122370A (en) 1931-06-23 1934-04-26 Slide wire resistance
US727630A US2058078A (en) 1931-06-23 1934-05-26 Instrument terminal construction
US109124A US2132617A (en) 1931-06-23 1936-11-04 Measuring instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US546290A US2150502A (en) 1931-06-23 1931-06-23 Measuring, indicating, and recording instrument

Publications (1)

Publication Number Publication Date
US2150502A true US2150502A (en) 1939-03-14

Family

ID=24179736

Family Applications (1)

Application Number Title Priority Date Filing Date
US546290A Expired - Lifetime US2150502A (en) 1931-06-23 1931-06-23 Measuring, indicating, and recording instrument

Country Status (1)

Country Link
US (1) US2150502A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423480A (en) * 1942-06-20 1947-07-08 Brown Instr Co Multiple recording instrument
US2432229A (en) * 1945-11-30 1947-12-09 Leeds & Northrup Co Compensating means for dimensional changes in recorder charts
US2506470A (en) * 1945-03-31 1950-05-02 Ibm Recording gauge system
US2514396A (en) * 1946-10-30 1950-07-11 Leonard D Jaffe Safety attachment for control mechanism
US2620256A (en) * 1948-05-29 1952-12-02 Quentin A Kerns Analyzer
US2774853A (en) * 1954-04-19 1956-12-18 Bendix Aviat Corp Variable resistance instrument
DE974464C (en) * 1952-05-31 1961-01-12 Licentia Gmbh Automatic voltage or current compensation device with practically no directional zero instrument
US4091389A (en) * 1976-03-31 1978-05-23 Yokogawa Electric Works, Ltd. Self-balancing recorder

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423480A (en) * 1942-06-20 1947-07-08 Brown Instr Co Multiple recording instrument
US2506470A (en) * 1945-03-31 1950-05-02 Ibm Recording gauge system
US2432229A (en) * 1945-11-30 1947-12-09 Leeds & Northrup Co Compensating means for dimensional changes in recorder charts
US2514396A (en) * 1946-10-30 1950-07-11 Leonard D Jaffe Safety attachment for control mechanism
US2620256A (en) * 1948-05-29 1952-12-02 Quentin A Kerns Analyzer
DE974464C (en) * 1952-05-31 1961-01-12 Licentia Gmbh Automatic voltage or current compensation device with practically no directional zero instrument
US2774853A (en) * 1954-04-19 1956-12-18 Bendix Aviat Corp Variable resistance instrument
US4091389A (en) * 1976-03-31 1978-05-23 Yokogawa Electric Works, Ltd. Self-balancing recorder

Similar Documents

Publication Publication Date Title
US2552017A (en) Flowmeter
US2150502A (en) Measuring, indicating, and recording instrument
US2707880A (en) Relative humidity measuring apparatus
US2389615A (en) Anemometer
US2404891A (en) Control apparatus
US1411396A (en) Electrical-resistance thermometer
US2099349A (en) Vacuum tube potentiometer
US2407075A (en) Ultra high frequency power measurement
US1974187A (en) Measuring apparatus
US2285118A (en) Impedance measuring apparatus
US1361676A (en) Measuring and indicating apparatus
US2073948A (en) Electrical telemetry
US2339861A (en) Measuring and control apparatus
US2230779A (en) Pyrometer potentiometer
US2364923A (en) Measuring apparatus
US2205306A (en) Electrical apparatus
US2431992A (en) Compensatory suppressed pointer adjustment for electric meters
US1995594A (en) Telemetric measuring system
US1745149A (en) Compensating apparatus for thermoelectric couples
US1432346A (en) Electrical indicator
US2096047A (en) Temperature measuring system
US2399903A (en) Electrical measuring apparatus
US2050878A (en) Measuring device
US2509048A (en) Temperature responsive measuring apparatus
US598905A (en) Hugh longbourne callendar