If the oil produces vapor which can be set on fire by means
of a flame held a short distance above the surface of the liquid, it
is bad. Good oil poured into a teacup or on the floor does not easily
take fire when a light is brought in contact with it. Poor oil will
instantly ignite under the same circumstances, and hence, the breaking
of a lamp filled with poor oil is always attended by great peril of
a conflagration. Not only the safety but also the light-giving qualities
of kerosene are greatly enhanced by the removal of these volatile and
dangerous oils. Hence, while good kerosene should be clear in color
and free from all matters which can gum up the wick and thus interfere
with free circulation and combustion, it should also be perfectly safe.
It ought to be kept in a cool, dark place, and carefully excluded from
the air.
The care of lamps requires so much attention and discretion, that many
ladies choose to do this work themselves, rather than trust it with
domestics. To do it properly, provide the following things: an old
waiter to hold all the articles used; a lamp-filler, with a spout,
small at the end, and turned up to prevent oil from dripping; proper
wicks, and a basket or box to hold them; a lamp-trimmer made for the
purpose, or a pair of _sharp_ scissors; a small soap-cup and soap;
some washing soda in a broad-mouthed bottle; and several soft cloths
to wash the articles and towels to wipe them.
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