Cast aluminum and wood (painted) on a vertical panel.
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Slotted yoke drive. This is an example of rotary motion being converted into straight line motion. So it is opposite to that of Boston model No. 12.
[Virginia Downward & William Clark, 1930]
[Editorís Note: This double-slider mechanism is similar to the Reuleaux-Viogt model D-8. Sometimes called a 'Skotch-yoke' mechanism, it transforms steady rotary motion into exact sinusoidal linear or straight-line motion in time. FCM]