Accession No

2627

Brief Description

alidade with mounted transit with telescopic sight, by Kern and Company, Swiss, 1900 (c)

Origin

Switzerland; Aarau

Maker

Kern and Company [main instrument] Carl Zeiss [lenses]

Class

surveying

Earliest Date

1900

Latest Date

1900

Inscription Date

Material

metal (brass, bronzed brass, steel, white metal) glass; string; wood (pine)

Dimensions

overall length 431mm; telescope length 215mm; vertical circle diameter 145mm; overall height 202mm box length 470mm; breadth 237mm; height 155mm

Special Collection

Provenance

Purchased from Sotheby’s Belgravia, London, England; lot 233, 18/07/1980.

Inscription

‘KERN & CO
Aarau-Schweiz
No17977’ (transit circle)
‘Carl Zeiss, Jena’ (objective and eyepiece of telescope)
‘+26024’ (each end of bubble level)

Description Notes

Telescope with rack and pinion focussing eyepiece. Cross hairs, lens cover and ray shade for objective. Lens cover for eyepiece; eyepiece adjustment. Vertical circle with silvered scale round rim graduated 60˚ - 0 - 60˚, numbered by 10˚ divided to 20´, read by single ‘A; type vernier to 1´. Magnifying glass. Clamp and slow motion screw for vertical circle. Bubble level mounted outside circle and graduated. Single levelling screw.
Telescope fixed to alidade with parallel rule and bevelled edge, which clamps closed.
Striding level; 4 clamps; spanner; screwdriver. Brass loop with hook on one end and point the other for use with plumb-bob. Steel slide rule in separate black leather case; sliding vernier scale. Blued steel screws.
Fitted wooden box.

Condition good; complete

References

Events