GB609828A - Surveying instrument - Google Patents

Surveying instrument

Info

Publication number
GB609828A
GB609828A GB125546A GB125546A GB609828A GB 609828 A GB609828 A GB 609828A GB 125546 A GB125546 A GB 125546A GB 125546 A GB125546 A GB 125546A GB 609828 A GB609828 A GB 609828A
Authority
GB
United Kingdom
Prior art keywords
mirrors
frame
mirror
carries
scale
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
GB125546A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB125546A priority Critical patent/GB609828A/en
Publication of GB609828A publication Critical patent/GB609828A/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
    • G01C1/00—Measuring angles
    • G01C1/02—Theodolites
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00

Abstract

609,828. Surveying-instruments. KHAREGAT, M. D. Jan. 14, 1946, No. 1255. [Class 97 (ii)] A surveying instrument comprises plane mirrors 1, 2, each having a projecting part such as 6, 7 adapted to fit in a gap in the other with corresponding edges in close relationship, the mirrors being mutually pivotable on spindle 5 so that their planes intersect; a guide line 13 is provided on each mirror at right angles to the axis of intersection, both lines being in the same plane. The frame 4 of the mirror 2 carries a pointer 9 and the frame 3 of the mirror 1 carries a scale 8 graduated to show twice the angle between the mirrors and indicating also standard angles of bend employed in drainage work. The frame 3 carries a spirit level 11 and the frame 4 a supplementary pivoted mirror 12 having a guide line 14. The scale 8 is preferably detachable for packing flat with the mirrors. According to the Provisional Specification the mirrors have an unsilvered portion near the pivot axis.
GB125546A 1946-01-14 1946-01-14 Surveying instrument Expired GB609828A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB125546A GB609828A (en) 1946-01-14 1946-01-14 Surveying instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB125546A GB609828A (en) 1946-01-14 1946-01-14 Surveying instrument

Publications (1)

Publication Number Publication Date
GB609828A true GB609828A (en) 1948-10-07

Family

ID=9718808

Family Applications (1)

Application Number Title Priority Date Filing Date
GB125546A Expired GB609828A (en) 1946-01-14 1946-01-14 Surveying instrument

Country Status (1)

Country Link
GB (1) GB609828A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2198849A (en) * 1986-12-13 1988-06-22 John Dewar Mcallan Navigation aid

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2198849A (en) * 1986-12-13 1988-06-22 John Dewar Mcallan Navigation aid
GB2198849B (en) * 1986-12-13 1991-07-24 John Dewar Mcallan Navigation aid

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