Perkins, Henry, 1803-1889, publisher, Haswell, Barrington, and Haswell, printer, McManus-Young Collection (Library of Congress) DLC · Philadelphia : H. Perkins, 134 Chestnut Street · leaf 159
the appearance of a quarter of a dollar and a shilling; andif a quarter of a dollar were put in, it would seem to be half adollar and a quarter of a dollar. MAGIC RAT TRAP. Prepare a pasteboard circle, upon one side of which drawa figure of a cage, and on the other side that of a rat. Near 138… … rapidly. When it is set in motion the transition is so quick, thatit presents the appearance of a rat in the cage. TO SHOW THE VELOCITY OF MOTION. Take a long hollow stalk or reed, suspend it horizontally bytwo loops of single hairs; by striking it with a sharp quick strokeat a point nearly in the…
Scientific recreations
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