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COALFIELDS AND COLLIERIES OF AUSTRALIA. 



would be instantly cut off. The governor lever, which is con- 

 trolled by a centrifugal ball governor, rises and falls accord- 

 ing to the speed of the engine, and as it does, it opens or 

 closes the graduated oil inlet valve, and also at the same time 

 a throttle on the air inlet, thereby providing for the exact 

 proportion of oil and air being maintained whatever the load 

 on the engine may be. The absence of a continuous burn- 

 ing lamp entirely eliminates all danger of fire arising from 

 inflammable material coming in contact with a naked flame. 

 The Fetter engine has an automatic tube ignition contained 

 in a small box attached to and forming part of the exhaust 

 outlet of the engine. The tube, which is made of a special 



Fig. 156. The Fetter Petroleum Engine and Pump. 



alloy, becomes red hot after the engine has been working for 

 about five minutes, and thereafter performs the duty of 

 igniting the vaporised oil and air. Being* enclosed in a box, 

 and protected from the cool outer air, these tubes last very 

 much longer than those used in other types of engines. Under 

 ordinary conditions three-quarters of a pint of oil is used per 

 b.h.p. per hour. 



The Aldrich electric pump (Fig. 157) in the "B" tunnel 

 has 5in. diameter plungers, Gin. stroke and a capacity of 100 

 gals, per minute. The motor that drives it revolves between 

 500 and 1000 times per min., and is 7ih.p. The original 

 electric plant consisted of a multi-polar generator built by the 

 Goodman Manufacturing Co., of Chicago (U.S.A.) for 275 



