Add as much bichromate of potash as the
solution will dissolve. More bichromate of potash should be added
as the precipitate is used in cleaning.
The chemicals can be purchased cheaply from a local drug store,
and made up and kept in large bottles. The solution can be used
over and over again. -- Contributed by Loren Ward Des Moines,
Iowa.
** Automatic-Closing Kennel Door [32]
When the neighborhood cats are retired for the night and there is
nothing more to chase, my fox terrier seems to realize that his
usefulness
[Illustration: Diagram of Closing Door]
for the day is over and begs to be put in his kennel that he may
not bark at the moon as some dogs are apt to do. This necessitates
my putting him out at a time when it may not be convenient.
Frequently in stormy weather this is a disagreeable duty and I
found a way to obviate it by making a trapdoor device for his
kennel as shown in the sketch whereby he may lock himself in when
he crosses the threshold.
The outer half A of the hinged trapdoor is made heavier than the
inner half B by a cleat, C, and a strip, D, to cause the door to
swing shut.
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