Taunton,.

Excesses of Sulphur in Grains per 100 Cubic Feet.
[Legal maximum, 30 grains.]

Citizens' (Nantucket),

Citizens' (Nantucket),

Clinton,

Clinton,

Total Num-
ber of

Date.

Inspections.

Sept. 21

Oct. 7

Nov. 3

Nov. 25

Dec. 6

Dec. 30

Amherst,
Lexington,

Natick,
Natick,

Sulphuretted Hydrogen Present-Concluded.

COMPANY.

Total Num-
ber of

Date.

Vineyard Lighting,

Oct. 26 10.6 8.03 12.90 39.52 32.13 3.52 0.21 3.69
Nov. 21 20.5 13.35 15.73 29.33 27.87 9.70 0.73 3.29
Dec. 29 20.0 13.53 14.58 35.63 30.95 1.34 0.28 3.69

The first 4 samples were taken, for information, in the ordinary course of testing. The next 4 in connection with calorific experiments. The Amherst and Lexington samples were taken at the time of the first inspection after a change had been made in the method of manufacture. The Vineyard

Lighting Company's sample was taken on account of low candle

power.

CALORIFIC TESTS.

A series of tests for calorific value and candle-power of Boston gas was made at the Hawley Street laboratory on March 21 and 22, 1910, at half-hour intervals, for thirty-six and a half hours.

The gas was a mixture of coal and water gases; samples taken at 10.55 AM., March 21, and at 12.40 P.M., March 22, were analyzed, and the results appear in the table of eudiometric analyses.

For the calorific value Junker's calorimeter, number 148, was used, the water being supplied from an overhead tank which was kept filled with water of room temperature. The outlet water was measured in a two-liter flask for the majority of tests, 19 tests, only, being made by weighing the water.

Fahrenheit thermometers, agreeing with each other, were used for water temperatures. Care was taken that the exit gas temperature was close to that of room and meter, the variation. running between 2 and 3 degrees.

At various tests determination was made of the heat produced by the condensation of water formed by the burning of the hydrogen content of the gas, the results being stated in B. T. U. per cubic foot from condensation.

The cande-power was taken immediately after each calorific test. The Board's portable photometer, with dry meter, was used, substituting an Edgerton standard for candles, and burning the gas, for the whole series of tests, in a Sugg's Argand burner, new F size, 7-inch chimney.

In the tables following are given the results of the test; in the first column the time of beginning of the determination, in the second the corrected gross British thermal units and in the third the corrected candle-power for 5 feet per hour of gas.