Journal of the Franklin Institute; devoted to science and the mechanic arts (1826)
Franklin Institute (Philadelphia, Pa.) · Oxford, Eng. [etc.] Pergamon Press [etc.] · leaf 305
c, has two of its four edges cut off (see fig. 2,) so as to al-low a free passage by it, reaching to the lateral perforation terminat-ing in another orifice, over which there is a gallows screw, g. Bymeans of this gallows screw, when requisite, a brass knob, such asthat represented by fig. 3,…
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