138 



Electric Plant for Experimental Purposes. 



Nc. r>U62S 



For electric light work these models can only be employed if a battery of accumulators is used simulta- 

 neously; even in the case of the larger models it is desirable to have a battery of accumulators connected up in 

 parallel. Prices of suitable dynamos and batteries on application. 



If required, dynamos working at pressures of 110 or 220 instead of 65 volts can be supplied, also dynamos 

 for charging accumulators without changing the speed. 



Estimates 



as to Electric Plant for Experimental Purposes with low speed Gas Engine, Dynamo and 



Battery of Accumulators. 



In cases where there is neither an electricity works or other heavy current plant available, 

 recourse must be had to the 'employment of one's own dynamo driven by a gas or petrol engine. It 

 is, however, strongly advisable to install a battery of corresponding capacity at the same time, as in 

 that case the working of the dynamo is more certain and the pressure more constant. 



In the case of the demand for current being normal, there is no necessity to have the engine 

 running each time current is actually required; it is simply necessary to charge the battery once or 

 twice a week. If the current demand is particularly great, the dynamo and battery are run in 

 parallel. 



These plants are also adapted for supplying current for lighting the lecture room at the 

 same time. 



The voltage of the dynamo is 65, this sufficing for all school experiments. If desired, it can 

 be supplied at a proportionate increase in price with 4 slip rings for supplying alternating and three 

 phase current. 



The accumulators are supplied ready built in with a view to facilitating erection and starting up. 



No. 

 



List No 



Continuous Capacity of the low-speed Motor, HP 



Revolutions per minute 



Output of Dynamo at 65 volts, Amps 



Capacity of Accumulators, ampere-hours 



Max. charge and discharge current of the accumulators, amperes 



Max. current in amperes which may be taken from the plant 



Gas Engine with tube ignition, with heavy flywheel and External bearings 



1 Set Foundation Bolts and Plates 



1 Gas Pressure Governor ' 



1 Starting Handle 



All Piping necessary for ordinary conditions inside the Engine Room (subject to 

 alteration) 



Price of the D. .C. shunt wound Dynamo (low-speed) 



Tension Slider 



Foundation Bolts 



Shunt Regulator 



Driving Belt for normal conditions 



35 Accumulator Cells built into glass vessels 



Acid for filling 



1 Specific gravity Indicator (hydrometer) 



1 Wood Stand, insulated 



1 Device for preserving the acid 



1 Hand Lamp for Battery Room 



1 Engine Room Switchboard, white marble panel with simple wood frame, containing 

 following apparatus : 1 precision ammeter, 200 mm diam. ; 1 precision volt- 

 meter, 200mm diam., with 2 shunts, central zero; 1 double cell switch; 1 mi- 

 nimum cutout; 1 main switch; 1 changeover switch; 9 single-pole fuses; 

 1 ammeter switch; 1 voltmeter switch 



50,625 



1 



250 



8.6 



36 



12 



20 



50,571 

 60. 10. 

 0. 13. 

 3. 5.0 

 3. 5.0 



6. 10. 



13. 0.0 



0. 13. 



0. 3.6 

 2. 15. 



1. 0.0 

 29. 0.0 



0. 10. 



0. 7.6 

 2. 10. 



1. 0.0 

 1. 0.0 



50,626 



2 



250 

 18.4 



48 



16 



34 



50,572 

 76. 10. 

 1. 0.0 

 3. 15. 

 3. 5.0 



7. 0.0 



17. 0.0 



0. 15. 



0. 6.0 



2. 15. 



1. 10. 



33. 15. 



0. 12. 6 



0. 7.6 

 3. 5.0 



1. 0.0 

 1. 0.0 



50,627 



3 



250 

 28.5 



60 



20 



48 



50,573 

 92. 0.0 

 1. 5.0 

 3. 15. 

 3. 5.0 



7. 0.0 



23. 15. 



1. 0.0 



0. 8.0 



3. 0.0 

 1. 18. 



54. 10. 

 0. 15. 



0. 7.6 



4. 6.0 



1. 0.0 

 1. 0.0 



18. 0.0 18. 0.0 18. 0.0 



Total 144. 2. 171. 16. 217. 4. 6 



1 Experimental Switchboard in accordance with complete list, should be provided; see pp. 107 132. 



3. 10. 3. 15. 



If a water-supply is not available, then a cooling vessel is necessary. 



Extra prices: 2.10.0 



The storage battery must be installed on an acid-proof flooring in a well ventilated room; 

 the battery room is best placed alongside the engine room, and it must be separated from the latter 

 by a masonry wall. 



The following are not included in the above prices: freight, packing, erection; also the con- 

 necting leads between dynamo, accumulators and switchboards. 



Estimates for installations with gas and petrol engines are supplied on application. 



