392 SEC. 12. APPLIED MECHANICS. 



1967a. Pumping Machinery (being largely used for raising 

 fluids, and the engine used as a prime mover.) 



Hayward Tyler and Co. 



In the pumping machinery, Nos. 1967a and 1963, great simplicity of con- 

 struction and durability of parts. In Nos. 1964 and 1965, combined with 

 the above is also the obtaining a longer stroke, means of starting from the 

 outside by a lever, and the obtaining of a " rest " at each end of the stroke to 

 al'ow time for the pump valves to close easily. 



1968. Bailey's Patent Quadruple Engine House Re- 

 corder registers on a diagram, which is removed, examined, 

 and replaced every 24 b^irs, th'e varying pressure of the boiler 

 and speed of the engine during that time. It consists of a steam 

 pressure gauge, and .a rotary speed indicator which registers on the 

 diagram round the revolving drum, an eight-day timepiece which 

 actuates the drum and indicates the time, and a thermometer, all 

 complete in French polished mahogany case, with closet for the 

 safe keeping of tools, scientific instruments, &c. 



W. H. Bailey $ Co., Manchester. 



1968a. Model of a Steam Engine with Glass Cylinders, 

 for demonstration, 1852. M. Eugene Bourdon, Paris. 



1978. Holt's Automatic Cylinder Drain Valves. 



The object of this is to let out condensed or priming water from 

 steam-engine cylinders. The valves open automatically at each 

 exhaust, or when the engine stands, and remain open until the 

 admission of steam, when they close, and prevent waste of steam. 



Henry S. Holt, C.E., Leeds. 



1979. Model of Dawes' Balanced Slide Valve. 



The peculiar advantage of this consists in the mode of making 

 an elastic joint between the relief frame and back of valve by 

 means of a steel plate, secured to both in such a manner as to 

 form practically one piece, thus avoiding leakage and the necessity 

 of frequent attention. Henry S. Holt, C.E., Leeds. 



1981. Model of Robey and Go's, semi-portable mining and 

 winding engine. Richardson's patent. Robey and Co., Lincoln. 



South Kensington Museum. 



1982. McCarter's Patent Condenser, applicable to 

 sleam engines, and other purposes where a vacuum is required 

 by the condensation of steam, without an air-pump being applied, 

 and drawing its own injection water. J. Wood. 



The condenser consists of two chambers, one above the other. The upper 

 chamber (H) is for condensing the steam, the lower one (G), with the two 

 tappet valves (C and D) opening into it, removes the condensed water from 

 the upper chamber into the hot water cistern, whence it flows away. 



The exhaust steam from engine enters at A, meets the injection water 



