Nelson Provincial Gazette – 1866 – No. 16

Page 64

✨ Coal trial results



64

REPORT OF TRIALS OF COAL SENT FROM NELSON, NEW ZEALAND,

Woolwich Dockyard, 18th December, 1865.

Kind of Coal Date of Trial Pounds of Water evaporated to 1 Pound of Coal consumed Cubic feet of Water evaporated per hour Per Centage of
Calculated at actual temperature of feed water Calculated at 100° constant temperature of feed water Calculated at actual temperature of feed water
:--- :--- :--- :--- :---
1865 lb lb Cubic feet
Grey Coal... November 17 8.64 9. 37.61
November 29 9.09 9.49 40.85
December 1 9.00 9.47 42.2
December 4 9.5 9.9 43.43
MEAN ... 9.08 9.46 41.02
Buller Coal December 13 9.41 9.83 42.08

REMARKS.

The Grey coal cakes in burning, and makes a hollow fire, forming a small quantity of light clinker, that does not adhere to the bars. Light ash only falls through the fire-bars, and a considerable quantity of white ash passes up the chimney, leaving a dark grey, sandy kind of dust in the tubes and fire-box. The smoke is small in quantity, and the coal is tender and likely to break small in being moved from ship to ship.

The Buller coal is a more open burning coal, and does not cake, forming a rather closer clinker than the other, and leaves a sooty deposit in the tubes and fire-box, more like the Hartly (North of England) coal, and gives off a black smoke.

No stoking tool was used in burning the samples of both kinds of coals, and nothing seems to be required beyond throwing the coal on to the fires; and the quantities of each clinker is not greater than that of the North of England coal.

The evaporative power of this coal is about the average of that of North of England coal as supplied to the service; but it is not quite so rapid, and requires a rather longer time to boil off a given quantity of water.

The trial on the 17th November was made with the bars half-inch apart; the remaining trials with the bars about three-eighths of an inch apart.

(Signed) J. TRICKETT,
Chief Engineer.
A. PATRIDGE,
Assistant.
To the Commodore Superintendent.

MR. TRICKETT'S ADDITIONAL TRIALS.

(COPY.)
Woolwich Dockyard,
23rd January, 1866.

I beg to report that additional trials have been made of the New Zealand coal, and a comparative statement is forwarded herewith. The mean result of ten trials of North country coal and ten trials of Welsh coal, at the same boiler, are given for comparison; from which it will be seen that the New Zealand coal evaporates more water per pound of coal than the North of England or Welsh, but does not evaporate it so rapidly; or, in other words, a larger fire-grate is required in the same boiler to evaporate a given quantity of water per hour with New Zealand coal than would be required if North of England or Welsh coal were used.



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✨ LLM interpretation of page content

🌾 Report of trials of coal sent from Nelson, New Zealand (continued from previous page)

🌾 Primary Industries & Resources
18 December 1865
Coal, Nelson, Woolwich Dockyard, Experiments, Evaporation, Clinker, Ash
  • J. Trickett (Chief Engineer), Author of coal trial report
  • A. Patridge (Assistant), Assistant to Chief Engineer

  • J. Trickett, Chief Engineer
  • A. Patridge, Assistant

🌾 Mr. Trickett's additional trials of New Zealand coal

🌾 Primary Industries & Resources
23 January 1866
Coal, New Zealand, Woolwich Dockyard, Experiments, Comparative statement
  • J. Trickett (Chief Engineer), Author of additional coal trial report

  • J. Trickett, Chief Engineer