Cast aluminum and wood (painted) on a vertical panel.
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The reverse motion of the driven shaft is caused by the meshing of a mutilated bevel gear with two bevel gears at right angles to it. It is also caused because the meshing of the gears is on opposite sides of the driver. The motion of both the driving and driven shafts is rotary. Compare action to that in No. 39.
[Virginia Downward & William M. Clark, 1930]
[Editorís Note: The use of a partially toothed gear to create an alternating rotary motion was used quite often by Leonardo da Vinci in his machine drawings found in the Codex Madrid I, e.g. Folio 17 Recto, though usually with two half toothed pinions and one fully toothed gear. FCM]