Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 273
quilateral triangles are cut from it, either with theircorresponding sides cut upon the same base line, or withone side of each cut from one side of a square, or they maybe cut and mounted haphazard. To the apex of the angle designed for attachment to thepaper tube a small drop of sealing wax is… … Mica Wheel, simultaneously by means of a small heated wire, such as aknitting kneedle. The other members are placed and secured in a similarway, care being taken to arrange the triangles symmetri-cally, and at a slight angle with the plane of rotation of theobject, as shown in the engraving. The…
Physics · Lantern projection · Electric apparatus and appliances
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