The connections are made from the batteries to
the bell in the usual manner. Two other wires are then connected,
one to the binding-post of the bell that is not insulated from the
frame and the other to the adjusting screw on the make and break
contact of the bell as shown in the sketch. The other ends of the
wires are connected each to a common table knife. This will give
quite a good shock and a much larger one can be had by placing one
knife in a basin of water and while holding the other knife in one
hand, dipping the fingers of the other hand in the water.
--Contributed by D. Foster Hall.
** Mahogany Wood Putty [139]
Mix venetian red with quite thick arabic muscilage, making it into
a putty, and press this well into the cracks of mahogany before
finishing. The putty should be colored to suit the finish of the
wood, says the Master Painter, by adding such dry color to the gum
as will give the best result.
** How to Make a Thermoelectric Battery [140]
By Arthur E. Joerin
A novel way of producing an electric current by means of hot and
cold water, heat from a match or alcohol
[Illustration: Details of Battery]
lamp, is obtained from a device constructed as shown in the
sketch.
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