Or from **LINK**
** How to Rid Your Yard of Cats [411]
The following is a description of a device I built at my home in
Brooklyn, which not only gave us relief from the
[Illustration: Electric Apparatus for Driving Away Cats]
nightly feline concerts, but also furnished much amusement to my
friends.
I first ran two bare copper wires along the top of the fence about
1 in. apart, fastening them down with small staples, care being
taken that they did not touch. To the ends of these wires I
fastened ordinary insulated bell wire, running them to the house
and connecting them to the upper binding-posts of an induction
coil; I then ran a wire from the lower binding-post of my coil
through the batteries back to the other lower binding-post of
coil, breaking the circuit by putting in an ordinary switch. The
more batteries used, the stronger the current. The switch should
always be left open, as it uses up the current very rapidly.
When "tabby" is well on the wires I close the switch and she goes
the length of the fence in bounds, often coming back to see what
the trouble is, thus receiving another shock.
–Contributed by Charles L. Pultz.
Might be one of the no's though.