) of any readily decomposable carbide, and is hung up in the apparatus
in such a position with regard to the slot _e_ on the disc _d_
that it will be the first receptacle to be discharged when the winch
_i_ is turned. The tin or bottle containing the sample for analysis
is then opened and weighed on a balance capable of weighing exactly to
1/2 gramme (say 10 grains). The carbide in it is then distributed
quickly, and as far as may be equally, into the nine remaining carbide
receptacles, which are then shut and hung up quickly in the generator.
The lid _b'_ is then screwed on the generator to close it, and the
empty tin or bottle, from which the sample of carbide has been removed,
is weighed.
"The contents of the first carbide receptacle are then discharged by
turning the winch _i_. Their decomposition ensures on the one hand
that the sealing water and the generating water are saturated with
acetylene, and on the other hand that the dead space in the generator is
brought under the pressure of the seal, so that troublesome corrections
which would otherwise be entailed are avoided. After the carbide is
completely decomposed, but not before two hours at least have elapsed,
the cock _p_ is shut, and the gasholder is run down to the zero mark
by opening the cock _q_.
Pages:
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682