拍品专文
It is believed that the additional readings from the drum may possibly indicate appoximate distance from a fixed point or land mass from the vessel
细节
A Kaisermaine micrometer sextant the black oxcidised brass frame with exposed brass index arm stamped with a capital 'M' surmounted by the Austo-Hungarian Crown numbered 1995, and further inscribed H. Haeche Neukölln 8056, pin hole sight, two mirrors (one missing), the inlaid ivory scale divided 5° - 0° - 100°, the vernier scale operated by a thumb-screw, whilst simultaneously operating a drum providing further readings/measurements -- 6¼in. (16cm.) dia
See illustration
See illustration