Larger versions of the pictures for the crowned pulleys article.

Threshing machine (1940s). Photo by Donald Simanek. Note the drum pulley on the tractor.

Fig. 1. Two types of crowned pulleys
and an analysis of the belt
passing over a tapered pulley.

Elements of Mechanism, Third Ed. by Schwamb, Merrill and James (Wiley, 1921)

TIFF files do not show on my computer screen, but I think it is here and should be downloadable.

Fig. 2. Belt passing over
misaligned pulleys.

Elements of Mechanism, Third Ed. by Schwamb, Merrill and James (Wiley, 1921)

TIFF files do not show on my computer screen, but I think it is here and should be downloadable.

Fig. 3. Construction set models using rubber bands.

Photo by Donald Simanek.

Fig. 3. Construction set models using rubber bands.
Alternate version with white background.

Photo by Donald Simanek.

Threshing machine (1940s). Photo by Donald Simanek.
Picture for Sam, not for the article.

Photo by Donald Simanek.

Flat belt with a twist. York Model Engineering show, April 2013
The pulley on the right is wooden, narrower than the belt.
Cross-view stereo.

Photo by Donald Simanek.