THE ELECTRIC LIGHT. 
33 
read an instructive paper at the meeting of the Society of Arts, 
on December 5th. He stated that in every instance his figures 
and particulars were those afforded by the users of the various 
lights and not by the inventors or their representatives. In 
the case of the Holmes machine the annual cost per lighthouse 
was about £1,035, inclusive of interest, repairs, and wages. 
With the Siemens machine the annual cost was about £494 per 
lighthouse, including interest and the other expenses. With 
the Alliance machine, as used at Havre, the cost was about £474 
per annum per lighthouse, interest, &c., included. The single- 
light Gramme machine has been in use in the Paris goods 
station of the Northern of France Eailway for two years. Six 
machines have been kept going with one light each, and the 
cost is found to be 5d. per light per hour, or with interest on 
outlay at 10 per cent., 8 d. per hour. The same light at the 
ironworks of Messrs. Powell, at Rouen, was stated to cost 4 d. 
per light per hour, exclusive of interest and charge for motive 
power, the latter being derived from one of the engines on the 
works. In 1877 a series of experiments were carried out with 
the Lontin light at the Paris terminus of the Paris, Lyons, and 
Mediterranean Railway. The passenger station was lighted, 
and the results were so satisfactory that the company have 
entered into a permanent contract with the proprietors of the 
Lontin light for lighting their Paris goods station with 12 
lights, at a cost of 5d. per light per hour. The Western of 
France Railway Company have had six Lontin lights in the 
goods station at the Paris terminus, St. Lazare, since May last, 
and 12 lights in the passenger station since June. Careful 
experiments have shown the cost to be 8d. per light per hour, 
inclusive of interest. Referring to the Jablochkoff light, Mr. 
Shoolbred placed before the meeting some particulars with 
regard to its application in the Avenue de 1’ Opera, Paris, which 
were afforded him by M. J. Allard, the chief engineer of the 
lighting department of the City of Paris. It appears that the 
authorities pay the Societe Generale d’Electricite 37f. 2c. per 
hour for the 62 lamps in use there. These 62 lamps super- 
sede 344 gas-jets which were previously used, and which cost 
the authorities 7*244f. per hour. The electric illumination, 
however, is considered as equal to 682 gas-jets, or about 
double the original illumination — that is, to a cost of 
14-45f. per hour as against 37*2f. for the electric light, the cost 
of which, therefore, is 2*6 times that of the gas. The contract 
for lighting by electricity was terminated by the City of Paris 
on the 30th of November, and the authorities have declined to 
renew it except at the price paid for gas — namely, 7*244f. (or 
nearly 6s.) per hour, and that only for a limited time. These 
terms have been accepted by the Societe, so that the price paid 
NEW SERIES, VOL. III. — NO. IX. D 
