372 Trial of Dr. Reid Clanny’s Lamp (May, 
the upcast shaft of the Herrington Mill Pit, by means of inflam- 
mable air obtained from a cast-iron tube communicating with the 
Hutton seam, and witnessed by the undersigned. 
In order to ascertain the quality of the gas given out at this tube, 
a bladder was filled from it, and on trial its contents proved to be 
carbureted hydrogen gas of the purest nature. 
_ One end of a leaden pipe was aiffixed to the iron tube; the other 
end placed within a room which was quite closed up, except at the 
door where the pipe entered. Ina very short time the carbureted 
hydrogen gas became mixed with the atmospheric air of the room 
up to the firing point, when the lamp, with a lighted candle within 
it, was carried into the centre of the room; and after conveying 
two or three draughts of air through the bellows, an explosion took 
place, which extinguished the candle without communicating to 
the surrounding inflammable atmosphere. This experiment was 
practised a second time, and the same results followed. 
On witnessing the experiment, the under-mentioned Wm. Pat- 
terson and Joseph Gleghorn declared that they would go into any 
part of a mine without any fear, if lighted by this lamp. 
(Signed) J. H. H. Houmes. 
Ww. Patrerson. 
Jos. GLEGHORN. 
Antu. Hopper. 
GrorGE PaTrerRson. 
i 
SECOND CERTIFICATE. 
(Copy-) 
Monday, Nov. 20, 1815. 
Dr. Clanny and Mr. Holmes (one of the undersigned) left Sun- 
derland this day, for the purpose of experimenting upon Dr. C.’s 
lamp, in some of the most inflammable parts of a coal-mine ; for 
notwithstanding that it was satisfactorily experimented upon on Oct. 
16, within a room filled with inflammable air at the firing point, 
it was thought expedient to carry it into those parts of a mine where 
its benefit must ultimately be produced. 
They descended the Herrington Mill Pitt, which is 101 fathoms 
in depth from the surface; and having proceeded upon the examina- 
tion of the mine, found the most inflammable part at the bottom of 
a staple, which was closed about 20 feet down by scaffolding, and 
made to communicate with the Hutton seam, which, being now 
worked out, is full of inflammable air. {And from this the tube 
runs by which we were enabled to make the experiments of Oct. 
16, 1815.—W. R. C.J ray 
Much caution was required in keeping the candles from approach- 
ing too near the staple, as their appearance, when held near the 
mouth, clearly indicated that, had they been introduced too far, an 
explosion must necessarily have followed, 
