BORE-HOLE INVESTIGATIONS 



1069 



truck is at its base station garage. The second method for power supply- 

 utilizes a small gasoline engine direct-connected to a 110-volt 60-cycle alter- 

 nator. A 1000 watt ONAN outfit is illustrated in Figure 663. Numerous 

 generating units of this type are available on the market. They may be 

 obtained generally in sizes ranging from 34 to 10 kilowatts capacity. 



Fig. 664. — Electrical logging truck containing cable reel and instruments. 

 A, reel compartment; B, instrument and control compartment. (Courtesy of 

 Schlumberger Well Surveying Corporation.) 



Fig. 66.5. — Electrical logging truck, showing reel compartment, prepara- 

 tory to making set-up at well. A, cable; B, sheave wheel; C, threaded sleeve 

 for connecting to device; D, safety stops; E, measuring sheave wheel. 

 (Courtesy of Schlumberger Well Surveying Corporation.) 



