另一个自我销售引擎。

另一个自我销售引擎。

Boston’s second self-propelling steam fire engine was recently successfully tested at the New England docks in South Boston.

The first test was through 200 feet of three-inch hose and a one and one-half inch nozzle—this being the easiest test of the day. Almost as quickly as the engine was started at speed, the pressure was run up to 240 pounds, and kept pretty close to that figure all through this tun, while the steam pressure varied from 137 to 120. On the next test, two lines of the same length and size were coupled on; one and one-quarterinch nozzles, however, being substituted for the larger one. On this test the engine did relatively better than on the first, as she was now well warmed up ami working in good style. She sent the water up tc 180 without dropping the steam pres sure at all. and reached a maximum pressure of 190, while holding 125 pounds of steam. The same two lines were then used again with a Siamese coupling and a one and five eighthinch nozzle, and on this trial the engine also worked beautifully. The water pressure reached 205 pounds before she was using all her steam, and the steam pressure never dropped below 130, although the maximum of 230 pounds water pressure was reached, and the pressure through most of the time was kept up to about 220. With a one and three-eight-inch nozzle on a Siamese coupling, the work was not relatively quite so good— the maximum w ater pressure attained being 190; and with a two-inch, 160 was the best that could be done. The last test was through a fifty-foot line of three and one-half-inch hose — the largest hose in use by the fire department. A two-inch nozzle was put on, and the engine threw the big stream far out on the water of the harbor, but could not long keep up the water pressure while throwing such a heavy body of water. While the water pressure was maintained evenly at about 100 pounds, the steam pressure ran down from 137 to 110.