od are cut
as shown, one with a slot to fit over the back of a magazine and
the other notched to serve as a clamp. The piece, A, may be
slotted wide enough to insert two or three magazines and made long
enough to hold several newspapers.

[Illustration: Clamp]

** Pewter Finish for Brass [435]

A color resembling pewter may be given to brass by boiling the
castings in a cream of tartar solution containing a small amount
of chloride of tin.

** Drowning a Dog's Bark with Water [435]

The owner of two dogs was very much annoyed by the dogs barking at
night. It began to be such a nuisance that the throwing of old
shoes and empty bottles did not stop the noise. The only thing
that seemed to put a stop to it was water.

[Illustration: Water Treatment for Dog's Bark]

Being on the third floor of the house, and a little too far from
the kennel to throw the water effectively, a mechanism was
arranged as shown in the sketch.

A faucet for the garden hose was directly below the window. An
8-in. wooden grooved pulley was slipped over an axle which had one
end fitted on the handle of the faucet. A rope was extended to the
window on the third floor and passed around the pulley several
times, thence over an iron pulley fastened to the wall of the
house and a weight was attached to its end. By pulling the rope up
at the window the large pulley would turn on the water and when
released the weight would shut off the flow. The nozzle was
fastened so as to direct the stream where it would do the most
good.
--Contributed by A. S. Pennoyer, Berkeley, Cal.

** Cost of Water [435]

The average cost of supplying 1,000,000 gal. of water, based on
the report of twenty-two cities, is $92. This sum includes
operating expenses and interest on bonds.

** How to Make a Wondergraph [436]
By F. E. TUCK

An exceedingly interesting machine is the so-called wondergraph.
It is easy and cheap to make and will furnish both entertainment
and instruction for young and old. It is a drawing machine, and
the variety of designs it will produce, all symmetrical and
ornamental and some wonderfully complicated, is almost without
limit. Fig. 1 represents diagrammatically the machine shown in the
sketch. This is the easiest to make and gives fully as great a
variety of results as any other.

To a piece of wide board or a discarded box bottom, three grooved
circular disks are fastened with screws so as to revolve freely
about the ce