It was about three times as efficient as Newcomen's engine. 它的功率是纽科门发动机的3倍。
Watt's engines were clearly much more economical than those of Savery and Newcomen but were relatively inefficient by modem standards. 瓦特的发动机很显然要比萨尔韦和纽科门的经济,但用现代的标准来看,效率相对较低。
A safer and better steam engine for pumping water was developed by Newcomen in 1712. 1712年,纽科门研制出一种更好、更安全的用来抽水的蒸汽发动机。