IV. RESERVOIRS OF ENERGY. 395 



and draining purposes. Cope and Maxwell's Patent. Hayward 

 Tyler and Co., 84, Whitecross Street, E.C. 



The steam cylinder is 5 inches in diameter. The stroke is 



7 inches. 



The pump plunger is 3 inches in diameter. 

 The valves are balls of india-rubber. 



The pump will raise 2,000 gallons per hour, forcing 120 feet 

 vertically. South Kensington Museum. 



1976. Three Models, in brass, showing in section the arrange- 

 ment of Giffard's patent injector for feeding steam boilers with 

 water. Sharp, Stewart, and Co., Engineers, Manchester, and 

 Victoria Street, S.W. 



a. Giffard's own patent injector in section. 



b. Giffard's injector in section, with the patent adjustment of 

 Messrs. Robinson and Gresham. 



c. Giffard's injector in section, with Seller's patent adjustment. 



South Kensington Museum. 



1977. Accessories. Pressure Gauges, for Engines, 

 Boilers, &c. Schaffer and Budenberg, 23, Lower King Street, 

 Manchester. 



a. A 5-inch Pearson's patent lubricator for steam cylinders, and 

 other working parts of machinery. 



b. Mercury vacuum gauge for condensing steam engines. 



c. Thermometer for measuring high temperatures. 



d. Bourdon's patent steam-pressure gauges, for high and low 

 pressure boilers. 



e. Bourdon's patent vacuum gauges. 



f. Schaffer's patent steam-pressure gauges for high and low 

 pressure boilers. Two of these gauges are in section showing 

 interior arrangement. 



g. Schaffer's patent vacuum gauges, for condensing steam 

 engines, &c. 



h. Schaffer's patent hydraulic-pressure gauges, with maximum 

 indicators. 



i. Blast furnace gauge, mercury ; indicating 6 Ibs. pressure. 



k. 7-figure counter, in section, for counting steam engine revo- 

 lutions and speeds of machinery. South Kensington Museum. 



1996. Working Model of a Hydraulic Bam, arranged 

 with glass air vessels, so as to show the action of a column of air 

 and pulsations of delivery valve. K. W. Hedges fy Co. 



This ram will raise one gallon of water per minute 8 ft. high by use of 

 four gallons of water falling 2 ft. 



