波士顿泵发动机的类型
其中一些由密尔沃基的Allis-Chalmers公司建造和安装的大型泵送发动机，是30,000,000座Gal。现有发动机在栗子山高级服务站的波士顿的大都市水厂之一是最优秀的公司之一。它的安装于1898年12月完成。它是垂直，三重扩张，独立的类型，具有三个单起外包柱塞，具有合同速度（约175/2每分钟的转数）容量of 30,000,01×1 U. S. gals, of water in twenty-four hours. The contract provided that the engine should perform a duty of 150,000,000 ft.-lbs. for each 1,000 lbs. of commercially dry steam used by the engine and auxiliary pumps, steam containing less than one and a half per cent, of entrained water, as determined by calorimeter measurement, to be considered as commercially dry steam; the work performed by the engine to be based upon pltm ger-displacement. The duty contracted for was performed, and considerably more, as the official test of the engine showed a duty of 178,497,000 ft.-lbs., which earned for tin* builders a bonus of $26,051.50 for economy over their guaranty. The diameter of the cylinders is 30-in., 56-in. and 87 in.; stroke, 66-in.; diameter of plungers, 42-in ; stroke of plungers, 66-in.; average revolution per min . 17.74; piston speed per min., 195.14 ft. The engine was fully described in FIRE AND WATER ENGINEERING of August 25.
同样的公司同样在东波士顿和鹿岛污水泵站的同样安装了四个离心泵，为城市的污水系统和第三十五街泵站中的两个。芝加哥泵送那个城市的污水。合同为东波士顿泵保障的责任为75.000,000英尺;由发动机第1号开发为91,104,390英尺。，由2号，92,458,975英尺的FT.-LBS。因此，该公司因此重新获得奖金。芝加哥第三十九街道泵站（标准3型V.S.C.）的容量为75铜。FT。每秒。这款风格的OI泵，伴随着这个通知的非常好的插图，用于处理高达40英尺的头部下方的大量水。，特别适用于污水处理和排水作品。泵在垂直轴上水平套，浸没，从而避免使用脚瓣和灌注管。插图中所示的发动机是三膨胀型，三个连接杆被布置成连接到普通的Crak-销。在水平面旋转的曲柄。 The cylinders are set at angles of 120°, this arrangement giving a steady effort to the crank-shaft and doing away with the necessity of a flywheel. The areas of the passages are so designed as to reduce the friction to a minimum and allow objects usually found in sewage to pass through, without choking the pump. The weight and thrust of the impeller and shaft are taken up by a self-aligning and adjustable thrust-bearing. The engines can be made simple or compound, condensing or non-condensing, as desired, and this company has built pumning units of this type in sizes ranging as high as 165,000,000 gallons per twenty-four hours.
棉花防火仓库。
在南方各州，不仅许多更大的棉花仓库正在建立起来，而且混凝土也开始被用作建筑材料。在孟菲斯,田纳西州。为例。有一家公司正在建造106个单层的仓库，其结果是使拖运和搬运棉花的劳动减少了，而且大大减少了火灾的危险。在佐治亚州梅肯。此外，一家公司刚刚成立，准备建造20个甚至更多的仓库，每个仓库可生产1000包棉花;其他部门也发来了类似的报告。许多仓库是用钢筋混凝土建造的。这样，从销售的角度来看，不仅棉花在储存和运输时受到的损害更小，而且火灾的危险几乎完全消除了。其结果将完全有利于茶叶以更好的形式进入市场，而且对茶叶的保险费率将大大降低。W. N.
