Power
being retained, however, to exempt from the order any method of
compressing acetylene that might be proved safe, the Home Secretary
issued a subsequent Order on March 28, 1898, permitting oil-gas
containing not more than 20 per cent, by volume of acetylene (see below)
to be compressed to a degree not exceeding 150 lb. per square inch,
_i.e._, to about 10 atmospheres, provided the gases are mixed
together before compression; while a third Order, dated April 10, 1901,
allows the compression of acetylene into cylinders filled as completely
as possible with porous matter, with or without the presence of acetone,
to a pressure not exceeding 150 lb. per square inch provided the
cylinders themselves have been tested by hydraulic pressure for at least
ten minutes to a pressure not less than double [Footnote: In France the
cylinders are tested to six times and in Russia to five times their
working pressure.] that which it is intended to use, provided the solid
substance is similar in every respect to the samples deposited at the
Home Office, provided its porosity does not exceed 80 per cent., provided
air is excluded from every part of the apparatus before the gas is
compressed, provided the quantity of acetone used (if used at all) is not
sufficient to fill the porosity of the solid, provided the temperature is
not permitted to rise during compression, and provided compression only
takes place in premises approved by H.
Pages:
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607