Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 667
ided while the tracing is being made, and atthe same time the construction allows of tilting the cellwhenever it is desirable to remove the tracing point fromthe surface of the glass. The diaphragm cell consists oftwo chambered recessed disks fastened together withscrews, and clamping between them… … Phonogr.iphic Recorder. ing lever, this being fulcrumed in a rigid arm projectingdownward from the cell. The free end of the tracing levercarries a fine cambric needle, which lightl}touches the sur-face of the smoked glass when the cell is in the positionshown. The tracing lever is made of a thin…
Physics · Lantern projection · Electric apparatus and appliances
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