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Quality of gas.
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12. The quality of the gas supplied by the Undertakers shall, with respect to its illuminating power, be such as to produce at the testing place provided in conformity with this Act a light equal in intensity to that produced by the prescribed number of sperm candles of six in the pound, and such gas shall as to its purity not exhibit any trace of sulphuretted hydrogen when tested in accordance with the rules prescribed in that behalf in Part II. of the Schedule A. to this Act annexed.
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