Beale, Lionel S. (Lionel Smith), 1828-1906 · London, Harrison · leaf 276
line of the base-board, just below the part where themilled screw traverses backwards and forwards in making thefocus, a hole with slanting sides is cut through. A light brassdouble beam arm hangs on the milled head, and is clamped, whenrequired, by a small clamping screw at the centre, to the… … [To face page 1S8.] ■WITH THE MICEOSCOPE. 159 up the clampiiig screw is turned to release the beam, and the focus-sing-screw now rotates easily ; when the camera is drawn to thedistance required, the clamping screw is made to fix the beam.The focussing eye-piece is held by one hand, while the…
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