Gasworks Clauses Act, 1871
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SCHEDULE A. | ||
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Part I. | ||
Sect. 28 . | ||
Regulations in respect of testing apparatus. | ||
1. The apparatus for testing the illuminating power of the gas shall consist of the improved form of Bunsen’s photometer, known as Letheby’s open 60-inch photometer, or Evans’ enclosed 100-inch photometer, together with a proper meter, minute clock, governor, pressure gauge, and balance. | ||
The burner to be used for testing the gas shall be such as shall be prescribed. | ||
The candles used for testing the gas shall be sperm candles of six to the pound, and two candles shall be used together. | ||
2. The apparatus— | ||
(a.) For testing the presence in the gas of sulphuretted hydrogen.— A glass vessel containing a strip of bibulous paper moistened with a solution of acetate of lead, containing 60 grains of crystallized acetate of lead dissolved in one fluid ounce of water. | ||
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Part II. | ||
Rules as to mode of testing gas. | ||
I. Mode of testing for illuminating power. | ||
The gas in the photometer is to be lighted at least fifteen minutes before the testings begin, and it is to be kept continuously burning from the beginning to the end of the tests. | ||
Each testing shall include ten observations of the photometer made at intervals of a minute. | ||
The consumption of the gas is to be carefully adjusted to five cubic feet per hour. | ||
The candles are to be lighted at least ten minutes before beginning each testing, so as to arrive at their normal rate of burning, which is shown when the wick is slightly bent and the tip glowing. The standard rate of consumption for the candles shall be 120 grains each per hour. Before and after making each set of ten observations of the photometer the gas examiner shall weigh the candles, and if the combustion shall have been more or less per candle than 120 grains per hour, he shall make and record the calculations requisite to neutralise the effects of this difference. | ||
The average of each set of ten observations is to be taken as representing the illuminating power of that testing. | ||
II. Mode of testing. | ||
(a.) For sulphuretted hydrogen.—The gas shall be passed through the glass vessel containing the strip of bibulous paper moistened with the solution of acetate of lead for a period of three minutes, or such longer period as may be prescribed; and if any discolouration of the test paper is found to have taken place, this is to be held conclusive as to the presence of sulphuretted hydrogen in the gas. |