1M20.60 - Wheel & Axle
Many examples of wheels on axles are available.
- Curt Suplee, "Wedges and Wheels" Everyday Science Explained, National Geographic, p. 34.
- Borislaw Bilash II, “A Wheel Problem“, A Demo A Day – A Year of Physical Science Demonstrations, p. 264.
- Joseph Frick, "# 60 - The Wheel and Axle", Physical Technics: Or, Practical Instructions for Making Experiments in Physics and the Construction of Physical Apparatus with the Most Limited Means, p. 72.
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