No. : 



Direct Current Dynamos. 



147 



Direct Current Dynamos. 



50713. 1:7. 



50714. 1:10. 



Direct Current Dynamos, Figures, for Belt Drive, Shunt Wound, for 65 volts Direct Current. 



a 



c3 



fl 



C 

 c 

 C 



-2 

 "5 



i 



o> 



JS 



o 



o 



* ) When ordering, in addition to mentioning the List Numbers, kindly quote the letters a, b, c, etc. placed 

 in front of the price h'nes.J 



These dynamos are used for generating electric current for feeding the projection lantern and for experi- 

 mental purposes. They have a belt pulley for driving, the belt from a gas engine, petrol motor or electric motor 

 being connected up with this. In order to obtain the necessary speed mentioned in the table, the belt pulley 

 diameter of the driving unit and of the dynamo must be in inverse ratio to the number of revolutions. If this 

 is not so, a belt pulley of correspondingly different dimensions must be obtained having due regard to the 

 ratios: an extra charge is made for this. The outputs mentioned are the maximum permissible outputs; the 

 machines can be overloaded for short periods. 



The medium and larger machines can, if desired, also be supplied for 115, 230, 460 or 550 volts. 



If not specially requested, the Dynamos are supplied Shunt Wound. If constant voltage with varying 

 load is required. Compound Wound machines can also be supplied without extra cost. 



For Charging Accumulators which have to supply 65 volts themselves, the foregoing machines can only 

 be used when their speed is proportionately, increased about 10 . If it is intended to use the machine thus, 

 express mention should be made of this fact when ordering. If it should not be feasible to increase the speed, 

 the dynamos catalogued in the following table should be selected, which can produce, without increasing the 

 speed, the higher current necessary for charging accumulators. 



If desired, dynamos with 4 slip rings are supplied: with these it is possible to take from three slip rings 

 interlinked three phase current of 44 volts pressure, and from two slip rings 38 volt single phase alternating 

 current. It is also possible by using all four slip rings to get two phase current, though this is somewhat un- 

 symmetrical. Outputs and prices on application. 



The dynamos can also be employed as Electric Motors in conjunction with 65 volt Direct Current: in this 

 case, however, a special Starting Rheostat is necessary in order to obviate too rapid putting into circuit and danger 

 of burning out the field winding when switching out. 



It is advisable to place the dynamos on a marble base, or at least on a firmly anchored wood frame. 



We also supply the following at the same time, if desired: Working Switchboards for the dynamos and 

 batteries pertaining thereto with fuses, main switches and single switches, metering instruments, terminals and 



For Small Hand-driven Dynamos and Dynamos for demonstration 

 purposes, see Section 'Electricity". 



CI. TF. SF. 



10* 



