Philosophical transactions, Vol. L. Part II. For the year 1758. / Giving some account of the present undertakings, studies, and labours, of the ingenious, in many considerable parts of the world.

by Various; Royal Society

The effect is, when the lever B moves the wheel A downwards; its click a, forces the rochet E, fixed on the arbor K, to move along with it, and the other wheels the same way. When it moves upwards, the click b fixed to the frame, stops the larger rochet C, and the wheel D next to it, which are pinned together; and as the wheel A is carried upwards by the lever, the pinion G towards the edge of it, is forced round the wheel D, and moves the pinion H, on the other side the great wheel A, which moves the wheel F fixed on the arbor K, the contrary way to the wheel A. By which means, the arbor K is constantly turned the same way, when the lever of the fire-engine moves either upwards, or downwards.

The pinion G, by being made proportionally smaller than the pinion H, keeps the arbor K in the same swiftness of motion, when the lever is moved upwards, as downwards.

Philos. Trans. Vol. L. Tab. XXVI. p. [730].

J. Mynde sc.

Philos. Trans. Vol. L. Tab. XXVII. p. [730].

J. Mynde sc.

Philos. Trans. Vol. L. Tab. XXVIII. p. [730].