Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 675
rubber for the receptionof the glass disk, upon which the tracing is to be made. Theglass is held in place by the pressure of two springs carry-ing rollers which bear upon the face of the glass at diame-trically opposite points. The face of the ring has a toothed rim, which is engagedby a small… … LANTERN PROJECTION. 053 The spur pinion carries an adjustable crank, the pin ofwhich turns in the cranic arm, and is apertured transverselyto receive the tracing rod, which may be clamped thereinby the thumb screw. The tracing- rod passes through a stud arranged to turnin the end of the movable arm…
Physics · Lantern projection · Electric apparatus and appliances
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