Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 199
disk having four radial slits. When the top is revolved and the lower disk is re-tarded, some very curious illusions will be produced. Attimes one part of the lower disk will appear to remain sta-tionary, while the other part will appear to revolve. Again,the two series of radial bars will appear… … bcv\>^\ ,\W Radi.il Disks. by the friction of the finger, some curious effects will beseen. The different rows of holes will appear to advanceand recede in a very erratic way. Fig. 177, 12 to 15 inclu-sive, illustrate the well known and ver} interesting toyknown as the chameleon top. This top is…
Physics · Lantern projection · Electric apparatus and appliances
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