Human engine

Human engine (three examples)
Three examples of a human engine: right a man turning a wheel to operate a lathe at a wood shop; top right, a worker dragging a cart of coal up an incline in a mine; bottom right, two human molecules bonded in a "working" relationship.
In science, a human engine, or "human motor", is an engine in which human motive power is converted into mechanical work.

Overview
Human engines can come in a number of varieties and configurations.

Shown adjacent (left) is a circa 1650-1750 depictions of a human engine: one, in the front, of a man turning a wheel to work a lathe, the wheel powered by a crank to turn a metal working lathe, where the smaller wheel is used for working with larger diameters and vice versa; two, pictured in the background, a man working a foot-powered lathe for machining wood. [1]

Shown above (right) is an example of a simple human engine: a young "drawer" pulling a coal tub up a mineshaft (c.1650-1750), a common way of getting coal out of mines prior to the development of the miner's friend (1697) and later steam engines (1710-1780), in which "work" is easily understood, via the 1824 Sadi Carnot definition, i.e. motive power, as weight lifted through a height. [2]

At bottom right, adjacent, is advanced theoretical 2005 depiction of a dihumanide molecular engine, namely two human molecules, i.e. people, one male Mx, one female Fy, in a bonded, via the electromagnetic force, into a "working" (or work producing) relationship. [3]

See also
Human machine

References
1. Diderot and d’Alembert. (1769-72). L’Encyclopedia. Publisher.
2. Thims, Libb. (2007). Human Chemistry (Volume One) (Miner's friend, pg. 49). Morrisville, NC: LuLu.
3. History – HumanThermodynamics.com.

Further reading
● Rosa, E.B. (1900). “The Human Body as Engine”, Popular Science Monthly, 57: 491-99.
● Amar, Jules. (1920). The Human Motor: or the Scientific Foundations of labour and Industry (human thermodynamics, pg. 191). Routledge.
● Rabinbach, Anson. (1990). The Human Motor: Energy, Fatigue, and the Origins of Modernity. University of California Press.

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