WW2 PERIOD BOXED MILITARY SURVEYING INSTRUMENT HB 41727.
Telescopic alidade made in 1941 by Hall Bros, Purley Way, Croydon, England, serial number 41727. The instrument is marked with the British Government “crow’s foot” and was supplied to the army. It would have been used on a plane table for mapping and could also be used for determining heights of features and determining distances as the eyepiece has stadia. It has a fitted wood case. The telescope is internal focusing. There are a clamp and slow motion for fine vertical adjustment, a magnifier for reading the vernier, and a screw for cross levelling. It is combined with a parallel rule for plotting the sight line.