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"Seaming-Maching. (a), vertical shaft and support, horizontally adjustable, and carrying at the top (a) former (f); (b), (a) counterpart former working at right angles with (f) on the support (c); (d), screw with crank by which (b) can be set toward or away from (f); (e), crank keyed to the shaft of (b). The edge of the metal is passed under (b) and over (f) which the crank (e) is turned." -Whitney, 1911

Seaming Machine

"Seaming-Maching. (a), vertical shaft and support, horizontally adjustable, and carrying at the top…