NEW METHODS OF ELECTRICAL EXPLORATION IN SIBERIA 215 



insulating lining, there are double "vvindo^v-frames and to protect the body 

 from cold air there is a tambour. Inside the body there is a stove; for further 

 heating, use can be made of the ballast resistance, the main function of 

 which is to load the generators during the time when their insulation is 

 being dried. The body is di\ided into two parts: in the first there is the 

 operator's section, in the second, the motor section. In the operator's 

 section there is a desk which carries the engine controls, the generators 

 and the measuring apparatus. 



There is also dark-room for developing the oscillograms. This part is 

 suitable for use as temporary living quarters for technical personnel 

 working at the station. 



Combining the generator and measuring apparatus in one body makes 

 it possible to use the ERST-23-56 station for probing with the AMNB 

 arrangement with only one operator. 



The pressure exerted by the tracks of the trailer A\dth the station does not 

 exceed 0.2 kg/cm^. 



The S-80 tractor intended for operation wdth the station is equipped with 

 a heated body, in which there is a table for the measuring apparatus, if it 

 becomes necessary to carry out dipole probes, and a winch to reel and unreel 

 the supply line when working with the AMNB arrangement. 



The winch is driven by a shaft from the tractor and is provided with an 

 automatic cable-laying device, designed for a PUM grade cable. The winch 

 can hold 6-8 km of this cable. During reeling and unreeling of the lines, 

 the tractor moves at speeds up to 9 km/hr. 



The dismountable electro -prospecting station is mounted on the GAZ-69 

 vehicle which can move cross-country. If the station cannot be moved 

 independently, the generator group can be taken to the place of work on 

 an MI -4 helicopter or on a small barge on the river. The overall layout of 

 the generator group is given in Fig. 15. If necessary, the generator (PN-145) 

 can be removed from the generator group together ^nth the plug board 

 and certain other auxiliary parts. 



The generator is mounted on a special sledge ^vhich guides it onto the 

 platform of the vehicle. To ease the assembly of the detachable parts there 

 is a special small winch on the vehicle and also screw clamps with which 

 one person without using tools can secure the generator to the vehicle. 

 At the same time as the generator is installed its shaft is connected to the 

 shaft from the gearbox. To reduce the length of the generator group, certain 

 units and components of the motor car body are removed, and the electrical 

 arrangement is simplified as much as possible, even to the exclusion from 

 it of an excitation rheostat. 



