GB133458A - - Google Patents

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Publication number
GB133458A
GB133458A GB133458DA GB133458A GB 133458 A GB133458 A GB 133458A GB 133458D A GB133458D A GB 133458DA GB 133458 A GB133458 A GB 133458A
Authority
GB
United Kingdom
Prior art keywords
range
sliding
bar
cross
advanced
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.)
Active
Application number
Publication of GB133458A publication Critical patent/GB133458A/en
Active 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
    • 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
    • G01C3/26—Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with fixed angles and a base of variable length, at, near, or formed by the object
    • G01C3/28—Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with fixed angles and a base of variable length, at, near, or formed by the object with provision for reduction of the distance into the horizontal plane
    • G01C3/30—Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with fixed angles and a base of variable length, at, near, or formed by the object with provision for reduction of the distance into the horizontal plane with adaptation to the measurement of the height of an object, e.g. tacheometers

Abstract

133,458. Lewis, E. H. Oct. 12, 1918. Range-finders. - Range-finders, also adapted for finding heights, comprise a graduated bar A having a sight-carrying cross-piece B sliding upon it and reading against graduations on the bar A giving the ratio of the range to the distance advanced in making the t w o observations necessary with this instrument. One of two sights C, D sliding on the crosspiece B is placed centrally at F and alined from the end O of the bar A upon the range-object, while the other is alined upon an auxiliary object, the cross-piece B 'being pushed up against a stop H; after the observer has advanced a known distance towards the range-object, similar alinements of the sight are obtained by sliding the cross-bar towards O. In finding heights, the two sights, one of which is centrally placed, are set upon the ends of the object and a similar setting obtained, after the observer has advanced a known distance towards the object, by sliding in the cross-piece. The ratio of the height required to the range which is caleulated as before, is given by the position of the lateral sight upon the graduations of the crosspiece.
GB133458D Active GB133458A (en)

Publications (1)

Publication Number Publication Date
GB133458A true GB133458A (en)

Family

ID=1726874

Family Applications (1)

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GB133458D Active GB133458A (en)

Country Status (1)

Country Link
GB (1) GB133458A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908281A (en) * 1973-01-29 1975-09-30 Michael C Fox Real estate appraisal instrument and method
GB2471384A (en) * 2009-06-22 2010-12-29 John Frayn Ewans Rowing-Boat measuring gauges

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908281A (en) * 1973-01-29 1975-09-30 Michael C Fox Real estate appraisal instrument and method
GB2471384A (en) * 2009-06-22 2010-12-29 John Frayn Ewans Rowing-Boat measuring gauges
GB2471384B (en) * 2009-06-22 2012-05-30 John Frayn Ewans Rowing-boat gauges
US8407910B2 (en) 2009-06-22 2013-04-02 John Frayn Ewans Rowing-boat gauges

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