Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 295
e the disk in the centerremains red; the hand will then point accurately to thehour. The accuracy with which the solar time may be indi-cated by this means will depend on the exactness withwhich the plane of polarization can be determined. Onedegree of change in the plane corresponds with four… … Salicine Crystals. there are thousands of beautiful forms lost to unaidedhuman vision which are revealed only to the user of the Fig. 284.
Physics · Lantern projection · Electric apparatus and appliances
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