They may be valued,
accordingly, mainly by their price, proper allowance being made for the
quantity of gas purified per unit weight of substance taken. This
quantity of gas must naturally vary with the proportion of phosphorus and
sulphur in the crude acetylene; but on an average the composition of
unpurified gas is what has already been given above, and so the figures
obtained by Keppeler in his investigation of the subject may be accepted.
In the annexed table these are given in two forms: (1) the number of
litres of gas purified by 1 kilogramme of the substance, (2) the number
of cubic feet purified per lb. It should be noted that the volumes of gas
refer to a laboratory degree of purification; in practice they may all be
increased by 10 or possibly 20 per cent.
_________________________________________________
| | | |
| | Litres | Cubic Feet |
| | per Kilogramme. | per Lb. |
|______________|___________________|______________|
| | | |
| Heratol | 5,000 | 80 |
| Frankoline | 9,000 | 144 |
| Puratylene | 10,000 | 160 |
| Acagine | 13,000 | 208 |
|______________|___________________|______________|
Another method of using dry bleaching-powder has been proposed by
Pfeiffer.
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