An ordinary telephone receiver is
connected in series with the coherer, as shown. To receive
messages hold the receiver to the ear and close the switch, and
answer by opening the switch and operating the key. --Contributed
by Coulson Glick, Indianapolis.
** Automatic Draft-Opener [102]
A simple apparatus that will open the draft of the furnace at any
hour desired is illustrated. The parts are: A, furnace; B, draft;
C, draft chain; D, pulleys; E, wooden supports; F, vertical lever;
G, horizontal lever; H, cord; I, alarm clock; J, weight. K shows
where and how the draft is regulated during the day, the automatic
[Illustration: Draft Regulator]
device being used to open it early in the morning. The spool on
the alarm clock is fastened to the alarm key by sawing a slit
across the top of the spool and gluing it on. When the alarm goes
off a cord is wound up on the spool and pulls the horizontal lever
up, which releases the vertical lever and allows the weight to
pull the draft open.
--Contributed by Gordon Davis, Kalamazoo, Mich.
** A Window Conservatory [103]
During the winter months, where house plants are kept in the home,
it is always a question how to arrange them so they can get the
necessary light without occupying too much room.
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