Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 270
-chests and water-chambers, the bolt remaining permanent. Fig. 528 is a liooh-hoM ; it relieves the necessity of a bolt through the bot-tom-piece, and may be turned like a button, to loose or hold the bottom-plate. Fig. 529 is another kind of button-bolt; the lower end can revolve on a studor pin…
Mechanical drawing
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