294 TAg Jablochkoff Candle : [April, 
Fifteen of the lamps were placed at alternate intervals on 
each side of the road, and one in the centre of the carriage- 
way at the junction of Newgate Street with the ViaduCt. 
As in the case of the Embankment the existing lamp-posts 
were utilised, the gas lanterns being removed, and replaced 
by the Jablochkoff candles and their accompanying opal 
glass globes. Measured crosswise the distance between the 
eleCtric lamps was about no feet, or about one-tenth farther 
apart than the eleCtric lamps on the Embankment. The 
light from each lamp, according to Colonel Haywood, covered 
an area of 888 square yards of public way. The lamps 
were lighted at sunset and continued burning until midnight, 
and replaced eighty-six gas-lamps, sixty-one of which were 
lighted at midnight. The eleCtric lamps were fed by two 
Gramme machines of a similar pattern to those used on the 
Embankment, driven by a Robey engine of 20-horse power 
nominal, the whole of the machinery being contained in a 
temporary shed ereCted on a piece of vacant land on the 
western side of Farringdon Street, close by the ViaduCt. 
The lamps were arranged in four circuits of four each, and 
the conduCting-wires were laid in tubes beneath the road 
and carried up inside the lamp-posts to the candles. The 
arrangement of the commutators was the same as on the 
Embankment. 
With respedt to the cost of the experiment, from the 14th 
of December to the 18th of February, the figures given by 
Colonel Haywood are as follows ‘ The Company agreed to 
provide, fix, and fit up the engine, machinery, conductors, 
and lamps for £236 8s. 4 d., and the Sewers Commission 
agreed to provide the shed and its enclosures and to do all 
the work underneath the roadway for about £267. From 
this must be deducted £50 10s. lod. allowed by the Gas 
Company for gas not burnt. In case of sudden extinction — 
which happened on four different occasions — a lamplighter 
of the Gas Company was in constant attendance from sun- 
set to midnight (an average of seven hours per night), at the 
comfortable wages of a few pence over £2 per week, which 
can hardly be considered exorbitant considering the onerous 
nature of his duties. The sixteen lamps were lighted from 
sunset to midnight at a charge of £5 per night, the average 
time which they have been alight during the experiment 
being (according to Colonel Haywood) about seven hours. 
The total cost of the experiment therefore, after de- 
ducting the saving in gas, cleaning the lamps used, &c., 
was £785 6s. 5 d. The rest of Colonel Haywood’s calcula- 
tions we need not enter into minutely. He tells us that, at 
