THE NILES ENGINE: When it is considered that the majority of steam users employ the cheaper classes of steam engines it is hardly necessary to seek for further reasons why the engine with existence of the improved automatic cut-off machines with all the advantages which they offer. To meet the demand for an efficient motor of the first mentioned type at low cost the machine herewith illustrated in Fig. 1 modeled after the English Tangye en gine is offered. The design is quite novel and simple the working parts are neat ly proportioned and adjusted to compen sate for wear and access to them is ren dered easy. The bed casting is cored out and the metal disposed as nearly as possible in the line of strain; when bolt ed down on the foundation the entire length is in contact with the masonry thus insuring stability. The steam chest is on the side of the cylinder and low enough to drain it of condensation. The connecting rod is a solid forging with out straps or stub ends. The mortises through each end are accurately broached for reception of the brasses and a sin gle cotter takes up the wear. The valve is driven directly by the eccentric rod. The diagram (Fig. 2) is taken from a 13x20 engine and exemplifies the valve motion given to the engine. In this case the machine was carrying its maximum load at rated speed with exhaust connected to a feed water heater. The ave rage back pressure independent of cushion is less than one half pound the total counter pressure referred to the whole stroke being less than five per cent of the average direct pressure. The engines are designed for use where the ordinary slide valve engine has hitherto been employed and are built in sizes varying from 6 to 16 inches diame ter of cylinders with 10 to 24 inches stroke. Fig. 3 exhibits a complete stationary en gine with vertical tubular boiler conve niently arranged on a substantial cast iron base. This engine is also Modeled after the Tangye but possesses some novel fea tures of its own. The
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