The American journal of the medical sciences (1827)
[Thorofare, N.J., etc.] Charles B. Slack [etc.] · leaf 51
1876.] Shakespeare, New Ophthalmoscope. 47 an inch, and its principal axis is parallel with the bar. Upon the same bar is placed a holder h, so that it may be moved backwards and forwards between l and c. The movement of the holder upon the bar d is effected by turning the screw s. This screw is so… … f, that during a revolution its position relative to the shoulder and the bar remains unchanged. Upon the whole length of the screw beyond this shoulder threads are cut forty to the inch. The threaded part of the screw turns in the holder h. The head of this screw is a half inch in
Medicine
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