C. (-43.6 deg. F.), and is completely solid
at -56 deg. C. (-69) deg. F.). Diluted with one-third its volume of water,
it freezes between -20 deg. and -28 deg. C. (-4 deg. and-l8.4 deg. F.). The
makers recommend that it should be mixed with an equal volume of water.
Another material known as "Gefrierschutzfluessigkeit" and made by the
Floersheim chemical works, freezes at -35 deg. C. (-3 deg. F.). Diluted
with one-quarter its volume of water, it solidifies at -18 deg. C.
(-0.4 deg. F.); with equal parts of water it freezes at -12 deg. C.
(10.4 deg. F.). A third product, called "calcidum oxychlorid," has been
found by Caro and Saulmann to be an impure 35 per cent. solution of calcium
chloride. Not one of these is suitable for addition to the water used in
the generating chamber of an acetylene apparatus, the reasons for this
having already been mentioned.] for the protection of gasholder seals.
Glycerin itself resembles a strong solution of calcium chloride in being a
viscid, oily-looking liquid; and both are so much heavier than water that
they will not mix with further quantities unless they are thoroughly
agitated therewith. Either may be poured through water, or have water
floated upon it, without any appreciable admixture taking place; and
therefore in first adding them to the seal great care must be taken that
they are uniformly distributed throughout the liquid.
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