and Transmission of Power. 



31 



caused by gas, (not to speak of the unhealthiness by the latter 

 to the employes), is so enormous, that many firms who have 

 adopted electricity, in London and elsewhere, have increased 

 the original installations four-fold. With respect to the employ- 

 ment of incandescent lamps in houses, I have had personal 

 experience of the benefit arising by the use of electricity over 

 other artificial modes of lighting, as I have had the electric light 

 in my house for several months, with most satisfactory results. 

 A careful perusal of the following table will no doubt prove 

 instructive. It was read by Mr. Crompton at the Health 

 Exhibition in London ; the results were the work of Dr. 

 Meymott Tidy and others : — 













Heat 



Burned to give light of 12 



Cubic feet 



Cubic feet 



Cubic 

 feet of 



Cubic feet 



produced 

 in lbs. 



candles, equal to 120 



of Oxygen 



of air 



Carbonic 



of air 



of water 



grains per hour. 



consumed. 



consumed. 



Acid 

 produced 



vitated . 



raised io° 

 Farht. 



Cannel Gas 



3"3° 



16-50 



2-OI 



217-50 



I95-00 



Common Gas 



5*45 



I7-25 



3-21 



34 8 -25 



278 60 



Sperm Oil 



475 



2375 



3'33 



35675 



233-50 



Benzole 



4-46 



2230 



3*54 



376-30 



232-60 



Paraffin 



6-8i 



34^5 



4'5° 



484-05 



361-90 



Camphine 



6-6 5 



33-25 



477 



5IO-25 



3 2 5 10 



Sperm Candles ... 



7-57 



3 7 '85 



577 



614-85 



35I70 



Wax Candles 



8-41 



42-05 



5'9° 



632-25 



383-10 



Stearic Candles ... 



8-82 



44-10 



6-25 



669-10 



37470 



Tallow Candles ... 



I2'00 



6o-oo 



873 



933.OO 



505-4° 



Incandescent ) 

 Electric Light j 











•13-80 



none 



none 



none 



none 



It will be seen by the above that bad as gas may be, it is not 

 nearly so injurious as oil and candles, but the electric light is 

 far superior to them all. 



With reference to the use of electricity as a transmitter of 

 power, the machinery employed is a double set of dynamos, 

 practically the same as used in electric lighting. By driving 

 one machine, the current is generated, and by allowing this 

 current to pass through another machine, its armature revolves, 



