Date: October 1750, 1752, 1791

"The less the body to the view, / The soul (like springs in closer durance pent) / Is all exertion, ever new, / Unceasing, unextinguish'd, and unspent"

— Smart, Christopher (1722-1771)

Date: 1751

"If any Man hath found out a Kind of Motive which doth not affect himself, he hath made a deeper Investigation into the 'Springs, Weights, and Balances' of the human Heart, than I can pretend to."

— Brown, John (1715-1766)

Date: 1752

A puppet may be "compell'd by secret Springs" just as an engine "moves with Motions not its own"

— Duncombe, John (1729-1786) [pseud.]

Date: 1757

"I only told him civilly, Past three o'clock and a cloudy morning!-- [...] --when, heyday! says he, (there he stands, let 'en deny it if he can) and coming up to me--what have we here?-- a human Clock!--a very odd kind of Repeater upon my soul!--one of the hours 'egad strolling about, in a...

— Bacon, Phanuel (1700-1783)

Date: 1758, 1781

"Hence then the Cause of all Defects is seen, / one wrong Movement spoils the whole Machine."

— Hawkins, William (1721-1801)

Date: 1784

"Thy piercing thought / Unaided saw each movement of the mind, / As skilful artists view the small machine, / The secret springs and nice dependencies, / And to thy mimic scenes, by fancy wrought / To such a wond'rous shape, th'impassion'd breast / In floods of grief, or peals of laughter bow'd, ...

— Jago, Richard (1715-1781)

Date: 1788

"With horns, and tail, and hoofs that make folks start; / And in my breast a millstone for a heart!"

— Wolcot, John, pseud. Peter Pindar, (1738-1819)