Improvements in the Application of Electricity to Surgical, Optical and like Instruments.

摘要

643. Richardson, S. Jan. 10. No Patent granted (Sealing fee not paid). Sight-testing and eye-examining apparatus.- Instruments for examining the eyes &c. have a portable electric battery &c. mounted on, in, or around the handle or other part of the instrument. In Fig. 2, which represents part of a retinoscope, the battery D for supplying current to the lamp B is enclosed in the handle C.