Improved Means for Focussing Opera, Field, Prismatic and other Binocular Glasses.

摘要

2363. Aitchison, J. Jan. 31. Telescopes and opera and field glasses. - Each objective, for focussing, is fitted in a tube a with a lateral pin h adapted to pass through a helical slot in a tube b and engage with a longitudinal slot g in the outer casing d. The upper edge c of the tube d is toothed to engage with a pinion i on the focussing spindle k. The second objective is similarly mounted and connected to the spindle k. Eyepieces may be fitted in a similar way.