Niagara Falls, New York, and Sault Ste. Marie, Michigan. This company
maintains a system of warehouses in more than one hundred and ten cities,
where large stocks of all sizes are carried.

The National Board of Fire Underwriters gives the following rules for the
storage of carbide:

Calcium carbide in quantities not to exceed six hundred pounds may be
stored, when contained in approved metal packages not to exceed one hundred
pounds each, inside insured property, provided that the place of storage be
dry, waterproof and well ventilated and also provided that all but one of
the packages in any one building shall be sealed and that seals shall not
be broken so long as there is carbide in excess of one pound in any other
unsealed package in the building.

Calcium carbide in quantities in excess of six hundred pounds must be
stored above ground in detached buildings, used exclusively for the storage
of calcium carbide, in approved metal packages, and such buildings shall be
constructed to be dry, waterproof and well ventilated.

_Properties of Acetylene._--This gas is composed of twenty-four parts
of carbon and two parts of hydrogen by weight and is classed with natural
gas, petroleum, etc., as one of the hydrocarbons. This gas contains the
highest percentage of carbon known to exist in any combination of this form
and it may therefore be considered as gaseous carbon. Carbon is the fuel
that is used in all forms of combustion and is present in all fuels from
whatever source or in whatever form. Acetylene is therefore the most
powerful of all fuel gases and is able to give to the torch flame in
welding the highest temperature of any flame.