They contain, however,
provisions that the price is to include packing, that the carbide must
not be delivered in lumps larger than the fist, that the sample may be
sealed in a glass vessel with well-ground glass stopper, that the sample
is to be transmitted to the testing laboratory with particulars of the
size of the lots and the number of drums drawn for sampling, and that the
whole of it is to be gasified in lots of upwards of 1 kilogramme (= 2.2
lb.) apiece.
In Italy, it is enacted by the Board of Agriculture, Commerce and
Industry that by calcium carbide is to be understood for legal purposes
also any other carbide, or carbide-containing mixture, which evolves
acetylene by interaction with water. Also that only calcium carbide,
which on admixture with water yields acetylene containing less than 1 per
cent. of its volume of sulphuretted hydrogen and phosphoretted hydrogen
taken together, may be put on the market.
It is evident from the regulations quoted that the determination of the
volume of gas which a particular sample of calcium carbide is capable of
yielding, when a given weight of it is decomposed under the most
favourable conditions, is a matter of the utmost practical importance to
all interested in the trafficking of carbide, _i.
Pages:
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675