ed as the cost of fuel
required to evaporate 1,000 pounds of water from and at 212 deg. F. To
find it, multiply the price of coal per ton by 1,000 and divide the
result by the product of the equivalent evaporation per pound of
coal and the number of pounds in a ton.

Suppose that the cost of the coal used in the foregoing test was
$3.60 per ton of 2,000 pounds. The equivalent evaporation per pound
of coal was 7.5 pounds. Therefore the cost of evaporating 1,000
pounds of water from 180 deg. F. to steam at 100-pound gage, is--

$3.60 x 1,000
------------- = $0.24, or 24 cents.
7.5 x 2,000

TABLE OF TEST RESULTS.

After the test has been made and properly worked up, as heretofore
described, collect all the results of the test on one sheet, so
that they can be kept in convenient form for reference and for
comparison with later tests. A brief form of arranging the results
is as follows:

1. Date of test May 20, 1918
2. Duration of test hours 10
3. Weight of coal used pounds 5,000
4. Weight of water fed and evaporated do. 35,000
5. Average steam pressure, gauge do. 100
6. Average feed-water temperature deg.F. 180
7. Factor of evaporation 1.0727
8. Equivalent evaporation from and at 212 deg. F. pounds 37,545

EFFICIENCY.

9. Efficiency of boiler and furnace per cent 54

CAPACITY.

10. Boiler horsepower developed 109
11. Builders' rated horsepower 150
12. Percentage of rated horsepower developed per cent 73

ECONOMIC RESULTS.

13. Actual evaporation per pound of coal pounds 7
14. Equivalent evaporation from and at 212 deg. F.
per pound of coal as fired, pounds 7.5
15. Cost of coal per ton (2,000 pounds) $3.60
16. Cost of coal to evaporate 1,000 pounds from and at
212 deg. F. $0.24

HOW TO USE THE TEST RESULTS.

The object of working up a test is to obtain a clear idea as to the
efficiency of operation of the boiler or its operating cost.
Consequently, after the calculations have be