 This turned on a nail driven into the box % inch above the middle of the top edge of the door. The door would fall inward as soon as the button was turned from its vertical to a horizontal position. A pull of 125 grams would do this if applied sideways...  Animal Intelligence: Experimental Studies - Página 31por Edward Lee Thorndike - 1911 - 297 páginasVista completa - Acerca de este libro
 | 1899 - 546 páginas
...opened. B1 may be called 'O at back 2nd.' y 2 inch thick. This turned on a nail driven into the box y 2 inch above the middle of the top edge of the door....applied sideways at the lowest point of the button 2 y± inches below its pivot. The cats usually clawed the button round by downward pressure on its top... | |
 | Lynne D. Houck, Lee C. Drickamer - 1996 - 872 páginas
...in Fig. i) was kept closed by a wooden button 3^ inches long, Tfa inch wide, IO EL THOIÏNDIKE. y¡ inch thick. This turned on a nail driven into the...round by downward pressure on its top edge, which was i^ inches above the nail. Then, of course, more force was necessary. C may be called 'Button.' D. The... | |
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