GB250737A - Improvements in range-finders - Google Patents

Improvements in range-finders

Info

Publication number
GB250737A
GB250737A GB775325A GB775325A GB250737A GB 250737 A GB250737 A GB 250737A GB 775325 A GB775325 A GB 775325A GB 775325 A GB775325 A GB 775325A GB 250737 A GB250737 A GB 250737A
Authority
GB
United Kingdom
Prior art keywords
arm
prism
screw
line
micrometer screw
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
GB775325A
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.)
JOHN LANCELOT EDEN
Original Assignee
JOHN LANCELOT EDEN
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 JOHN LANCELOT EDEN filed Critical JOHN LANCELOT EDEN
Priority to GB775325A priority Critical patent/GB250737A/en
Publication of GB250737A publication Critical patent/GB250737A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C3/00—Measuring distances in line of sight; Optical rangefinders
    • G01C3/10—Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with variable angles and a base of fixed length in the observation station, e.g. in the instrument

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Helmets And Other Head Coverings (AREA)

Abstract

250,737. Eden, J. L. March 23, 1925. Range-finders.-Rangefinding apparatus consists of two arms hinged together and capable of being separated by a micrometer screw, one of the arms carrying a fixed and an adjustable prism. The adjustable prism and the micrometer screw are operated so as to convert the apparatus into a reduced facsimile of the triangle formed by the object ranged upon and the two prisms, the micrometer screw measuring one side of the triangle so formed. An arm 1 carries two prisms 4, 6, the prism 6 being half the height of the prism 4 and adjustable about a pivot 7 by a screw 8. Pivoted to the arm 1 is a second arm 2, which is moved against the action of a spring 21 by micrometer screw 15. On this arm 2 is mounted a mirror 10, a hair-line 17, and a lens 16. The distant object is sighted along the arm 1 through both prisms 4, 6 the line of sight passing through the mirror 10 from the prism 6 and through the aperture made by turning the shutter 12 into a. position at right angles to the arm 2, and the line of sight in the upper part passing through the prism 4 past hair lines 5 to the object. The screw 8 is adjusted until coincidence is effected and then the shutter 12 is closed and the screw 15 adjusted until the line 17 is sighted by means of the mirror 10 in conjunction with lines 5. The reading on the micrometer screw 15 gives the range.
GB775325A 1925-03-23 1925-03-23 Improvements in range-finders Expired GB250737A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB775325A GB250737A (en) 1925-03-23 1925-03-23 Improvements in range-finders

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB775325A GB250737A (en) 1925-03-23 1925-03-23 Improvements in range-finders

Publications (1)

Publication Number Publication Date
GB250737A true GB250737A (en) 1926-04-22

Family

ID=9839045

Family Applications (1)

Application Number Title Priority Date Filing Date
GB775325A Expired GB250737A (en) 1925-03-23 1925-03-23 Improvements in range-finders

Country Status (1)

Country Link
GB (1) GB250737A (en)

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