Building construction and superintendence, by F.E. Kidder ... (1896)
Kidder, Frank E. (Frank Eugene), 1859-1905 · New York, W.T. Comstock · leaf 369
Yalelock, the later improvements being in theshape of the key and keyhole. In theoriginal Yale lock the keyhole was a nar-row vertical slot, and it was possible for anexpert lock-picker to open the lock by tilting a key or pieces of wireup and down in the keyhole until the pins were brought to the… … Fig 388.
Building
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