Johnson type plane table outfit, 1914

Made:: 1914 in Troy

maker:: W and L E Gurley

Johnson type plane table outfit for comparatively high precision work, by W. and L.E. Gurley, Troy, New York, USA, 1914

Details

Category:: Surveying

Object Number:: 1914-742

type:: plane table

credit:: W. & L. E. Gurley

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Parts

Part of Johnson type plane table outfit, American 1914

Alidade level for Johnson type plane table outfit for comparatively high precision work, by W. & L.E. Gurley, Troy, New York, USA, 1914.

Measurements:: overall: 235 mm x 510 mm x 100 mm, 3.96kg

Materials:: brass (copper, zinc alloy) , glass and alcohol

Object Number:: 1914-742 Pt1

type:: instrument component and plane table

Image ©: The Board of Trustees of the Science Museum

Part of Johnson type plane table outfit, American 1914

Combined compass and levels for Johnson plane table outfit for comparatively high precision work, by W. & L.E. Gurley, Troy, New York, USA, 1914

Measurements:: overall: 30 mm x 111 mm x 111 mm, .63kg

Materials:: brass (copper, zinc alloy) , zinc plate , steel (metal) , glass , spirit , iron and brass wire

Object Number:: 1914-742 Pt2

type:: instrument component , plane table , circumferentor and magnetic compass

Image ©: The Board of Trustees of the Science Museum

Part of Johnson type plane table outfit, 1914

Adjustable set-square for Johnson type plane table outfit for comparatively high precision work, by W. and L.E. Gurley, Troy, New York, USA, 1914

Measurements:: overall: 20 mm x 510 mm x 220 mm, .44kg

Materials:: wood (unidentified) and brass (copper, zinc alloy)

Object Number:: 1914-742 Pt3

type:: instrument component , plane table and set-square

Part of Johnson type plane table outfit, American 1914

Spare dew-cap and bubble level glass for Johnson type plane table outfit for comparatively high precision work, by W. and L.E. Gurley, Troy, New York, USA, 1914.