SIR WILL/ AM SIEMENS, F.R.S. 373 



require 8,018 x 11 = 38,200-horse power to work it. It maybe 

 fairly objected, however, that there are many houses in the parish 

 iniK-li In-low the standard here referred to, but, on the other hand, 

 tin-re are GOO of them with shops on the ground floor, involving 

 lar-vr requirements. Nor does this estimate provide for the large 

 consumption of electric energy that would take place in lighting 

 the eleven churches, eighteen club-houses, nine concert halls, three 

 theatres, besides numerous hotels, restaurants, and lecture halls. 

 A theatre of moderate dimensions, such as the Savoy Theatre, has 

 been proved by experience to require 1,200 incandescence lights, 

 representing an expenditure of 133-horse power ; and about one- 

 half that power would have to be set aside for each of the other 

 public buildings here mentioned, constituting an aggregate of 

 2,926-horse power ; nor does this general estimate comprise street 

 lighting, and to light the six-and-a-half miles of principal streets 

 of the parish with electric light, would require, per mile, thirty- 

 five arc lights of 350-candle power each, or a total of 227 lights. 

 This, taken at the rate of 0'8-horse power per light, represents a 

 further requirement of 182-horse power, making a total of 3,108- 

 horse power, for purposes independent of house lighting, being 

 equivalent to 1 -horse power per inhabited house, and bringing the 

 total requirements up to 109 lights = 12-horse power per house. 



I do not, however, agree with those who expect that gas lighting 

 will be entirely superseded, but have, on the contrary, always 

 maintained that the electric light, while possessing great and pecu- 

 liar advantages for lighting our principal rooms, halls, warehouses, 

 &c., owing to its brilliancy, and more particularly to its non-inter- 

 ference with the healthful condition of the atmosphere, will leave 

 ample room for the development of the former, which is susceptible 

 of great improvement, and is likely to hold its own for the ordinary 

 lighting up of our streets and dwellings. 



Assuming, therefore, that the bulk of domestic lighting remains 

 to the gas companies, and that the electric light is introduced into 

 private houses, only, at the rate of, say twelve incandescence lights 

 per house, the parish of St. James's would have to be provided 

 with electric energy sufficient to work (9 + 12) 3,018 = 63,378 

 lights = 7,042-horse power effective; this is equal to about one- 

 fourth the total lighting power required, taking into account that 

 .the total number of lights that have to be provided for a house are 



