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EUDIOMETRIC ANALYSES. The following eudiometric analyses have been made during the year:
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 candlepower.
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.
From condensation, British thermal units per cubic foot: 1 44.1; 2 46.6; 3 50.3; * 47.7; $ 46.5 6 59.6; 7 51.0.
A continuous test of calorific and lighting value, similar to the foregoing, was carried on at the Franklin Street station of the Taunton Gas Light Company, Taunton, about one and a quarter miles from the gas works, on Sept. 27, 28 and 29, 1910.
The gas supplied was an unenriched coal gas; the first day the yield of gas was low, owing to fine coal and low heats. On the second and third days the yield was better, the coal coarser and heats higher. Benzol had been used for enriching within two weeks, and, owing to the warm weather, may have had some effect on the candle-power. The gas supply came through a dry governor, and the pressure was constant at 22 tenths inches.
The same Junker's calorimeter, wet meter and thermometers, were used as in the test above-described; the water was taken from an overhead tank, with automatic supply and gas-heating attachment; the outlet water was weighed in all the determinations.
The candle-power was taken on a 100-inch stationary bar photometer, with wet meter, Edgerton standard, and new F size, Sugg's Argand burner, with 7-inch chimney.
Tests were made of the heat given out by the condensation of water formed from the burning of the hydrogen present in the gas, and the results are stated later as British thermal units per cubic foot from condensation.
Two samples of gas were taken and the analyses appear in the table of eudiometric analyses.
The results in the following tables are the corrected gross British thermal units and corrected candle-powers for 5 feet gas per hour:
From condensation, British thermal units per cubic foot: 1 57.1; : 57.9.