The Babcock Test. 



61 



machines of this kind were very noisy, but at the present 

 time the best machines on the market are of this type. 



These are pro- 

 vided with spiral 

 cog gear and ball 

 bearings, are 

 strongly made 

 and will run 

 smoothly and 

 without noise 

 (Figs.21-22);in 

 cog gear ma- 

 chines the bot- 

 tles are always 

 whirled at the 

 speed which the 

 number of turns 

 made by the 

 crank would in- 

 dicate. 



70. Power testers. For factory purposes, steam tur- 

 bine machines (Figs. 23-24) are most satisfactory when 

 well made and 

 well cared for. 

 They should al- 

 ways be pro- 

 vided with a 

 speed indicator 

 and steam 

 gauge, both for 

 the purpose of 

 knowing that 

 sufficient speed 



is attained, and FIG. 24. Type of Babcock steam turbine testers. 



FIG. 23. Type of Babcock steam turbine testers. 



