The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose

by Thomas Walter Barber

[1127]. Horizontal pumping engine, with yoked crossheads and crank in centre.

[1128] & [1129]. Horizontal compound lever engines.

[1130]. Davey’s patent vertical compound beam mining pump.

The Cornish beam pumping engine is too well known to need illustration.

In mining pumps the pump rod has occasionally been made of iron pipe and employed as the rising main.

[1131]. Geared pumping engine, with steam cylinder and pump side by side; the speed of the steam piston is reduced on the pump by spur gearing.

---

Section 62.—PAWL AND RATCHET MOTIONS.

INTERMITTENT MOTION.

[1132]. The common ratchet-wheel and pawl, or detent.