GB343228A - Improvements in or relating to telescopes or other optical instruments - Google Patents

Improvements in or relating to telescopes or other optical instruments

Info

Publication number
GB343228A
GB343228A GB3778029A GB3778029A GB343228A GB 343228 A GB343228 A GB 343228A GB 3778029 A GB3778029 A GB 3778029A GB 3778029 A GB3778029 A GB 3778029A GB 343228 A GB343228 A GB 343228A
Authority
GB
United Kingdom
Prior art keywords
objective
lens
class
telescopes
tacheometric
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
GB3778029A
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.)
EDWARD WILFRED TAYLOR
JAMES SIMMS WILSON
Original Assignee
EDWARD WILFRED TAYLOR
JAMES SIMMS WILSON
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 EDWARD WILFRED TAYLOR, JAMES SIMMS WILSON filed Critical EDWARD WILFRED TAYLOR
Priority to GB3778029A priority Critical patent/GB343228A/en
Publication of GB343228A publication Critical patent/GB343228A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/04—Reversed telephoto objectives

Abstract

343,228. Tacheometric telescopes. WILSON, J. S. and TAYLOR, E. W., Buckingham Works, York. Dec. 9, 1929, No. 37780. [Class 97 (i).] The objective system of a tacheometric telescope, of the kind described in Specification 242,468, [Class 97 (i), Optical systems &c.], comprising a collective objective and a negative focussing lens of equal and opposite power, is corrected for curvature of field, cornea and astigmatism by selecting the powers and refractive indices of the various lenses so as to satisfy the Petzval condition. In the example given the achromatic objective A is a cemented doublet and the negative focussing lens B consists of two outer dispersive lenses and a central collective lens. The objective A and the focussing lens B are of equal and opposite power. The lens B is also achromatic. Specification 18721/12, [Class 97 (ii), Surveying &c. instruments] is referred to.
GB3778029A 1929-12-09 1929-12-09 Improvements in or relating to telescopes or other optical instruments Expired GB343228A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3778029A GB343228A (en) 1929-12-09 1929-12-09 Improvements in or relating to telescopes or other optical instruments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3778029A GB343228A (en) 1929-12-09 1929-12-09 Improvements in or relating to telescopes or other optical instruments

Publications (1)

Publication Number Publication Date
GB343228A true GB343228A (en) 1931-02-19

Family

ID=10398952

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3778029A Expired GB343228A (en) 1929-12-09 1929-12-09 Improvements in or relating to telescopes or other optical instruments

Country Status (1)

Country Link
GB (1) GB343228A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424283A (en) * 1945-08-09 1947-07-22 Bendix Aviat Corp Optical system for telescopes and binoculars
EP0246108A2 (en) * 1986-05-16 1987-11-19 William Penton Nathan An optical device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424283A (en) * 1945-08-09 1947-07-22 Bendix Aviat Corp Optical system for telescopes and binoculars
EP0246108A2 (en) * 1986-05-16 1987-11-19 William Penton Nathan An optical device
EP0246108B1 (en) * 1986-05-16 1993-03-24 William Penton Nathan An optical device

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