POWELL’S DUFFRYN COAL.

December Ylth.

Fire Lighted ..8h. 15m.

Steam up.. . 9h. 20m.

Weight of Wood used. 10 Jbs.

Initial Temperature of Water in Boiler . . 209°

Temperature of Water in Tanks .... 33°

Barometer. ....

Extremes of external Thermometer . . . ....

Extremes of internal Thermometer .... 42—54°

Dew Point. ....

Area of Damper open.112 in.

Weight of Coals consumed ...... 321 lbs.

Weight of Ashes left.16*5 lbs.

Per Centage of combustible matter in Ashes . 52*76

Weight of Cinder left.12*5 lbs.

December 12 th.

Per Centage of combustible matter in Cinder . 89*74

Weight of Clinker in Cinder.None.

Average Weight of Soot in Flues »... 1 lb.

Per Centage of combustible matter in Soot . 51*39

Weight of Water evaporated. 2793 lbs.

Weight of Water evaporated from 212° by

lib. of Coal. 10*307lbs.

Weight of Coals per Hour for 1 Square Foot of

Grate Surface.8*01 lbs.

Duration of Experiment.8 hrs.

Specific Gravity of Coal.1*326

Mean Weight of Cubic Foot of Coal . . . 53*22 lbs.

Economic Weight or Space occupied by one Ton 42*09 c.f.Cohesive Power of Coal. 56*2

EXTRACT FROM THE REPORT OF SIR H. DE LA BECHE AND DR. PLAYFAIR

ON POWELL’S “ DUFFRYN COAL.”

“ Our remarks during the trials show that it kindles very readily, and burns freely, raising thesteam with great rapidity. It makes a remarkably clean fire, without any smoke, opening well onthe bars, without caking. No clinkers were made. The ashes and cinders left were clean, and of awhitish colour.”

The following is a letter from the Admiralty, intimating the approval of POWELL’S DUFFRYN STEAM COAL, for use

in Her Majesty’s Steam Ships :—

gjl^ Admiralty, 3rd January, 1845.

Referring to my letter of the 29th of April last, I have to acquaint you, in pursuance of the directionsof the Lords Commissioners of the Admiralty, that favourable reports of the trial of your Duffryn Coals onboard Her Majesty’s Steam Vessels having been received, the “ Duffryn ” will be included in the List of Coalssupplied under the Naval Contracts. j am> gj r

Your humble Servant,

Thomas Powell, Esq. (Signed) R. DUNDAS, Storekeeper-General.

“ Great Britain” Steam Ship, Liverpool, 14 th February, 184G.

I hereby certify, that I have found Powell’s Duffryn Steam Coal the best I have yet used for AtlanticSteaming, being hard, strong, and durable Coal, making very little clinker, and easy on the fire-bars.

(Signed) JAMES HOSKEN, Commander.

“ Great Western” Steam Ship, Liverpool, 12th October, 1845.We, the undersigned, have much pleasure in recommending Powell’s Duffryn Steam Coal. Havingused it on board this vessel in competition with several descriptions of Welsh Coal, wo find it possessesgreater durability, and is more free from smoke and soot that any other Coal wo have yet met with.

(Signed) B. R. MATTHEWS, Commander.

JOSEPH WILLIAMS, Engineer.

This is to certify, that we have used Powell’s Duffryn Steam Coal in the “ Swift ” Steamer, runningbetween this Port and Newport, and have found it superior to any other Coal for tubular boilers, withwhich this vessel is fitted, both from its economy and freedom from soot and smoke.

(Signed) JAMES PARFITT, Commander.

Bristol, August 2nd, 1845. CHARLES MILLER, Engineer.