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will give with the Worsley coals for every lb. of coal 8*29 of 
steam, or not including the heating of the feed water from 
60° to 212°F., 9*67 lbs. 
2. The boiler usually known as James Watt’s “ Waggon- 
shaped Boiler,” 25 feet 6 inches long and 6 feet 6 inches 
diameter, under similar circumstances will yield 8*80 of steam, 
or not including the heating of the feed water from 60° to 
212°, 10-26 lbs. 
3. The plain cylindrical boiler with fire place underneath, 
42 feet long and 6 feet diameter, under similar circumstances 
will yield 6*20 of steam, or not including the heating of the 
feed water from 60° to 212°, 7*23 lbs. 
4. The boiler with two internal fire places joined into one 
internal flue, known in this neighbourhood as the “ Breeches 
Boiler,” 23 feet long and 8 feet diameter, under similar cir- 
cumstances will yield 5-90 of steam, or not including the 
heating of the feed water from 60° to 212°, 6-88 lbs. 
5. That a supplementary boiler, under very favorable cir- 
cumstances, gives a saving of 15 per cent. 
6. That flues round a boiler cleaned out and the sides of 
the boiler scraped once a week, will give a saving of about 2 
per cent. 
7. That a difference in the setting alone of the same boiler 
may readily produce a difference in the result amounting to 
21 per cent. 
8. That the difference between a good shaped boiler pro- 
perly set and a bad shaped boiler improperly set, but both 
clean and in good order, may amount to 42 per cent. 
9. That a difference in firing only will produce a difference 
in the result of 13 per cent. 
10. That the smallest loss by smoke burning, or by the 
admission of cold air either over the furnace door or in front 
of the bridge or at the back of the bridge, has been 1-7 per 
cent. 
