A late 19th Century brass plane table alidade, signed KERN & Co Aarau-Schweiz No.19022 , the telescope with rack and pinion focusing, vertival circle with vernier scale and magnifier attachment, graduated bubble level on central pillar, with cross bubble, over alidade, in fitted wooden case with accessories incuding two graduated bubble levels and trough compass - 18in.(46cm)wide
A late 19th Century brass plane table alidade, signed KERN & Co Aarau-Schweiz No.19022 , the telescope with rack and pinion focusing, vertival circle with vernier scale and magnifier attachment, graduated bubble level on central pillar, with cross bubble, over alidade, in fitted wooden case with accessories incuding two graduated bubble levels and trough compass - 18in.(46cm)wide
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