Modern magic. : A practical treatise on the art of conjuring. (1885)
Hoffmann, Professor, 1839-1919, Hawkins, Arthur, ca. 1940 · London ; New York : G. Routledge and Sons · leaf 368
,whereby b may be at pleasurebolted to a, and the two maythus be handed for examina-tion, with little chance of theirsecret being detected. Thebolting, and unbolting is effected by a slight movement up or down ofthe knob in front, thereby raising or depressing a kind of hook ofbent tin, working in… … FlG. 174.
Magic tricks
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