The practical steam engineer's guide in the design; construction and management of American stationary, portable and steam fire-engines for the use of engineers, firemen and steam users - Softcover

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 Excerpt: ... that if the steam had an actual pressure of six atmospheres the water would issue at a velocity of about 101 feet per second, and the steam at a velocity of about 1,800 feet per second. Referring again to Fig. 67 it will be seen that a pipe marked "overflow" leads out from the centre of the instrument; this pipe communicates with a small chamber in the central channel just below the level of the pinion, and is intended to allow the escape of any surplus water. When the supply of steam is properly adjusted to the amount of water sucked into the instrument no overflow takes place, whereas an access of water or steam will at once give rise to a discharge at the overflow. In the one case the energy imparted to the water is insufficient and part recoils, while in the other case too great a condensation of 'steam will occur and energy will be dissipated. It is, however, easy to adjust the steam and water regulators so as to avoid any waste. The rise in temperature of the feed-water shows the amount of energy available for doing work, and it is found that the quantity of water delivered into the boiler increases as the feed-water itself is supplied in a colder state. Thus, in one case, the temperature of the feed-water before entering the injector was 60, 90, 120, and the number of gallons of water delivered per hour was 972, 786, 486 respectively. It is a confirmation of the explanation that steam at a given pressure will force water into a boiler against a still higher pressure. Thus, steam at 27 lbs. pressure forced water into a boiler where the steam was at 52 lbs. pressure, the temperature of the feedwater being raised from 92 to 170 during the operation. The "1876" Injector, By William Sellers & Co., Philadelphia, Pa. The introductio...