The Practical mechanic's journal . ot, or melting brass, a set of fire-bars arefitted, and the blast is directed upwards between their interstices. Aconical cover, lined with fire-clay, is also fitted over the fire, to be raisedto admit of the insertion or removal of the shot. In melting, a simpleoctagonal cupola, lined with fire-clay, supplies the place of the fire-pan. Being constructed entirely of iron, these forges are proof against theattacks of insects, or the injurious effects of tropical climates, and for thisreason they will be found most suitable for ships work. To show therate of he
The Practical mechanic's journal . ot, or melting brass, a set of fire-bars arefitted, and the blast is directed upwards between their interstices. Aconical cover, lined with fire-clay, is also fitted over the fire, to be raisedto admit of the insertion or removal of the shot. In melting, a simpleoctagonal cupola, lined with fire-clay, supplies the place of the fire-pan. Being constructed entirely of iron, these forges are proof against theattacks of insects, or the injurious effects of tropical climates, and for thisreason they will be found most suitable for ships work. To show therate of heating, we may mention that a bar of iron, 1J inches in diameter,can be brought to a welding heat in from three to four minutes. HILLS IMPROVED COVERING FOR WAGGONS. A novel covering for railway waggons, possessing several ingeniousand useful features, has lately been introduced by Mr. Christopher Hillof New Swindon, Wilts. Fig. 1 of our engravings is a longitudinalelevation of a waggon fitted with Mr. Hills cover; fig. 2 is an end. Fig. 2. 3-16tu = 1 foot. elevation, half in section ; and the detached figure, between the wheelsin fig. 1, is an enlarged view of one end of the cover guide-rods, with itsrunning roller. In our main elevation, one half of the waggon cover isrepresented in section, a b, Arethe standing end covers, one inelevation; the other sectioned toshow its internal arrangement,c c, Are a series of iron rods, hav-ing their ends formed as in thedetached figure, with brass rollers,D. These rods stretch across be-neath the entire length of themoveable cover, e, and rest, bymeans of their end rollers, upon agrooved guide formed round thehood or standing cover. Project-ing horns are forged on the endsof these rods, standing out directlyover the rollers, d, aud arrangedto cany the cover over the block-ing necessary to form the spacefor the latter. The covering isstretched, and attached upon therods by rivets or sewing, andcan be readily shifted, by drawingdown at eithe
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Keywords: ., bookcentury1800, bookdecade1840, bookidpra, booksubjecttechnology
