Cotton weaving: its development, principles, and practice . r either light or heavy sub-stances, can be made. A worm of this kind has been agreat desideratum, and Mr. Wrigley, by its invention, hasplaced the world of mechanics under an obligation. Another important method of economizing the heatgenerated in the boiler furnaces is the economizer, as itis called, and an illustration of a set of which is given infig. 190. These pipes are placed behind the boiler, thefeed water for which passes through them. As the hotgases leave the boiler flues they impinge upon these pipesand heat the water con
Cotton weaving: its development, principles, and practice . r either light or heavy sub-stances, can be made. A worm of this kind has been agreat desideratum, and Mr. Wrigley, by its invention, hasplaced the world of mechanics under an obligation. Another important method of economizing the heatgenerated in the boiler furnaces is the economizer, as itis called, and an illustration of a set of which is given infig. 190. These pipes are placed behind the boiler, thefeed water for which passes through them. As the hotgases leave the boiler flues they impinge upon these pipesand heat the water contained in them to or over theboiling point, so that it does not lower the temperatureof that contained in the boiler when it enters, and doesnot itself require to be heated up to boiling point by thefurnace fires. This valuable adjunct to steam generationintroduced by Messrs. Green and Sons, Wakefield, is sowell known as not to require any further remarks. An important part of the furniture of modern steamboilers are the valves. The now common practice of. Fig. 190.—Greens Economizer. CONSTRUCTION OF A WEAVING ESTABLISHMENT. 375 working at very high pressures, and the growing tendencyto increase even these has to a great extent renderedobsolete the older types of valves, and their continued usein the changed circumstances not free from risk. To suitpresent needs the dead weight valve, which has done goodservice in its day, would need to be constructed in a verycumbrous form, and with a large increase of material. Fora boiler working at about1501b. pressure it requiresover half a ton dead weightfor a 3 inch valve. Tomeet the new requirementsan improved valve has beendesigned (Fowlers patent)and placed upon the marketby the makers, Messrs. Mel-drum Brothers, Engineers,Manchester. This improve-ment is termed The CompactDead - weight Safety - valve,and is illustrated in fig. consists of a hollow sphe-rical casing resting on twoseats, one face of the valveand one face of th
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