Screw-jack press with crank, nut and wheel
Sectioned threaded columns and a crank mechanism; the opening at right is labelled 'Mouth'
Detailed pen studies of a screw mechanism, most likely a screw-jack or press. At left a threaded column is shown in section in two registers; at centre a crank turns a squared nut that rides on a horizontal screw; below right a disc or wheel with a crossed hub is drawn. A single word, placed at the right, labels an opening as the 'mouth'.
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Threaded screw column, crank-nut and wheel
The sheet works out a screw device in several views: a column cut open to show its internal thread, a crank driving a squared nut along a screw, and a hub-crossed disc below. The lone caption placed at the right identifies an opening as the 'mouth' of the mechanism. Together the studies read as a screw-jack or press.