456 SEC. 12. APPLIED MECHANICS. 



risks of a boiler explosion, it is peculiarly suited for use as a motor in a 

 laboratory. The consumption of gas is seldom over 2s. 60?. worth per week 

 for a 1-HP. engine. The engine as here exhibited contains many quite 

 recent and very important improvements. 



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



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



1946. Sectional Model of a Steam Engine, with expansion. 



Paul Lochmann, Zeitz. 



1948. Wall-diagrams illustrating the Hot-air Engine. 



Prof, von Gizychi, Aix la Chapelle. 



1949. "Wall- diagrams illustrating the Gas Engine. 



Prof, von Gizycki, Aix la Chapelle. 



1950. Wall-diagram illustrating the Steam Engine, with 

 continuous expansion. Prof- v on Gizycki, Aix la Chapelle. 



These diagrams are used in Prof, von Gizycki's lectures on description 

 and theory of machines. 



1968. Bailey's Patent Quadruple Engine House Se- 

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

 and replaced every 24 hours, the 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, ail 

 complete in French polished mahogany case, with closet for the 

 safe keeping of tools, scientific instruments, &c. 



W. H. Bailey $ Co. 



1978. Holt's Automatic Cylinder Brain 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 P. Holt, C.E. 



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 P. Holt, C.E. 



1982. McCarter's Patent Condenser, applicable to 

 steam 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 



