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[Technical Drawing of a Maytag Twin-Cylinder Engine]

Description: Illustration from The Wesley Pettinger Engine Model Collection. The first page features a technical drawing of a Maytag twin-cylinder engine, presented from the top down, along with handwritten notes detailing specific aspects and measurements. The second page has a technical drawing of a crankshaft for the engine with a large X drawn over it and the caption "void".
Date: [1999,2012]
Partner: UNT Libraries Special Collections

[Grain Grinder Chained to a Speed Reducer]

Description: Photograph from The Wesley Pettinger Engine Model Collection. Photograph of a grain grinder chained to a speed reducer. Each machine is bolted onto a wooden block. The back of the photograph has text that reads: "Belt driven 3:1 speed reducer with sprocket and chain drive to a grain grinder.; Castings and drawings by: Joe M. Tochtrop; 2028 McAllister St.; San Francisco, CA 94118".
Date: 2011
Partner: UNT Libraries Special Collections

[Model Economy Gasoline Engine Connected to a Grain Grinder]

Description: Photograph from The Wesley Pettinger Engine Model Collection. Photograph of a model Economy engine connected by a belt to a speed reducer, which is chained to a grain grinder. The back of the photograph reads: "Model Economy Gasoline Engine with optional bronze flywheels and friction clutch pulley belted to a 3:1 speed reducer with sprocket and chain drive to a grain grinder.; Castings and drawings by: Joe M. Tochtrop; 2028 McAllister St.; San Francisco, CA 94118".
Date: 2011
Partner: UNT Libraries Special Collections
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