GB626642A - Improvements in or relating to light beam indicating apparatus - Google Patents

Improvements in or relating to light beam indicating apparatus

Info

Publication number
GB626642A
GB626642A GB1565246A GB1565246A GB626642A GB 626642 A GB626642 A GB 626642A GB 1565246 A GB1565246 A GB 1565246A GB 1565246 A GB1565246 A GB 1565246A GB 626642 A GB626642 A GB 626642A
Authority
GB
United Kingdom
Prior art keywords
mirror
scale
chosen
deflection
block
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
Application number
GB1565246A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1565246A priority Critical patent/GB626642A/en
Publication of GB626642A publication Critical patent/GB626642A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D7/00—Indicating measured values
    • G01D7/02—Indicating value of two or more variables simultaneously
    • G01D7/04—Indicating value of two or more variables simultaneously using a separate indicating element for each variable
    • G01D7/06—Luminous indications projected on a common screen

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lenses (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

626,642. Indicating-apparatus. STANDARD TELEPHONES & CABLES, Ltd., and GILLETT, W. F. H. May 23, 1946, No. 15652. [Class 106 (iv)] In a light beam indicator system of the type in which an angularly moving mirror reflects a projected beam on to a scale, there is interposed in the path of the beam a mirror or refracting medium so shaped that the resulting deflection on the scale bears to the deflection of the moving mirror a relationship which follows a different law from that which it otherwise would. Fig. 1 (Prov.) shows a mirror FM shaped to transform the approximately linear relationship between the scale and angle of deflection of a mirror galvanometer into a logarithmic one, SC being an arbitrarily chosen logarithmic scale, GM being the galvanometer mirror and the shape of the interposed mirror FM being obtained graphically by trial. This consists of drawing the paths of rays from GM to arbitrary points and then to the appropriate parts of the scale, e.g. G, O<SP>1</SP> O, to obtain the directions of the tangents to the mirror. Those points O<SP>1</SP>, M<SP>1</SP>, L<SP>1</SP>, &c. are chosen which enable a smooth curve to be drawn through the tangents. Fig. 2 shows how to obtain the shape of a block of refracting material to be used instead of a mirror. Two lines F<SP>1</SP>, F<SP>2</SP> are drawn parallel to the chosen scale SC and the outline of F<SP>2</SP> is modified graphically by using the formula Á sin i=sin r. As shown, a scale range of 0db-18db has been chosen, the ray corresponding to 18db being drawn normal to the block F<SP>1</SP>, F<SP>2</SP>, In a further embodiment (Fig. 6, not shown), the block is thicker and the surface F<SP>1</SP> is modified, F<SP>2</SP> being left plane and having the scale marked on it. Specification 453,279 is referred to.
GB1565246A 1946-05-23 1946-05-23 Improvements in or relating to light beam indicating apparatus Expired GB626642A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1565246A GB626642A (en) 1946-05-23 1946-05-23 Improvements in or relating to light beam indicating apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1565246A GB626642A (en) 1946-05-23 1946-05-23 Improvements in or relating to light beam indicating apparatus

Publications (1)

Publication Number Publication Date
GB626642A true GB626642A (en) 1949-07-19

Family

ID=10062987

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1565246A Expired GB626642A (en) 1946-05-23 1946-05-23 Improvements in or relating to light beam indicating apparatus

Country Status (1)

Country Link
GB (1) GB626642A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205768A (en) * 1962-09-18 1965-09-14 Bausch & Lomb Optical element
DE102008047422A1 (en) * 2008-09-15 2010-04-15 Endress + Hauser Wetzer Gmbh + Co Kg Field device i.e. data display device, has projection module arranged within housing, and projection surfaces and housing aligned on each other such that projection surfaces and projected data are visible outside of housing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205768A (en) * 1962-09-18 1965-09-14 Bausch & Lomb Optical element
DE102008047422A1 (en) * 2008-09-15 2010-04-15 Endress + Hauser Wetzer Gmbh + Co Kg Field device i.e. data display device, has projection module arranged within housing, and projection surfaces and housing aligned on each other such that projection surfaces and projected data are visible outside of housing

Similar Documents

Publication Publication Date Title
CH272698A (en) Fixed focused electron beam device.
FR1060514A (en) Variable focal length optical system
GB626642A (en) Improvements in or relating to light beam indicating apparatus
GB591991A (en) Improvements in or relating to measuring the focal length of lenses
GB595940A (en) Method and apparatus for counting or examining optical interference rings or lines
CH310552A (en) Wide angle lens.
GB975309A (en) Variable focal length lens system
GB1450783A (en) Perimetric instrument for determining the limits of the visual field
GB1152973A (en) Axially Measuring Ophthalmometer
CA478857A (en) Optical parallax measuring instruments such as rangefinders
FR57785E (en) Improvements in devices for measuring the power of lenses and optical systems
GB751149A (en) Optical imaging system especially for a measuring microscope
GB565881A (en) Improvements relating to apparatus for comparing the dimensions of objects
GB782151A (en) Goniometer
CA478061A (en) Optical systems for microfilm apparatus
GB671453A (en) Improvements in micro projection apparatus
GB586970A (en) Improvements in optical indicating apparatus
GB623656A (en) Improvements in and relating to apparatus for screen brightness measurement
GB586071A (en) Improvements relating to optical gauging apparatus
FR1036086A (en) Radiant flat sheet beam optical device
FR1061321A (en) X-ray measuring chamber.
AU151682B2 (en) An optical inspection device
FR1118932A (en) Very narrow band telephone transmission system
ES11660U (en) Support for portable optical measuring instruments. (Machine-translation by Google Translate, not legally binding)
CA496412A (en) Beam clamp