Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892)
Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 505
door, it having been found that the introduction of li(|ni<l explosivesthrough the joint around the spindle constituted a vital point of attack. On tlie automaticbolt-f>[)erating devic-c then; is no ext(>rnal coinmuniiation whatever, tlie bolt-work beingthrown by si)rings upon tlie closing… … Fig. 9.—Yale time-lock.
Mechanical engineering
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