A Lens Cap withTelescopic Alidade for Plane Table, by E. R. Watts & Son Ltd., 1944

Subject: Mathematical instruments
Item type: Object
Provenance: Transferred from the Dept. of Earth Sciences per Dr. J. G. Olliver
Primary inscriptions: on case "ALlDADE. 1."
Other inscriptions: INSTRUMENT NO. 24137 DATE 18/2/44
Physical material: metal
Object type: Alidade
Dimensions: Diameter: 41mm Height: 19mm Weight: 30g
Inventory No: 11273
Accession Number: 1987-20/5

Description

A lens cap sits at the large end of the shaft.