1M20.20 - Block & Tackle
- Thomas B. Greenslade Jr., "Two Differential Mechanisms", TPT, Vol. 59, #4, April 2021, p. 294.
- William Blunk, William Kopp, Earl Zwicker, "Doing Physics", TPT, Vol. 25, # 1, Jan. 1987, p. 59.
- Aubrey F. Burstall, "The Chinese Windlass", Simple Working Models of Historic Machines, p. 38.
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