细节
A 19th-century brass surveying level,
signed Dollond London, the telescope with object-glass dust-slide, bubble level and located on the limb by two clamps, with vertical adjustment, on pillar stand, 12¼in. (31.1cm.) long; and a brass scissor-pattern parallel rule (2)
signed Dollond London, the telescope with object-glass dust-slide, bubble level and located on the limb by two clamps, with vertical adjustment, on pillar stand, 12¼in. (31.1cm.) long; and a brass scissor-pattern parallel rule (2)