lustration: Holding Coins between Glasses]

show both sides of coins without touching or handling them. If the
collection consists of only a few coins, they can be arranged in a
frame as shown in Fig. 1. The frame is made of a heavy card, A,
Fig. 2, the same thickness as the coins, and covered over on each
side with a piece of glass, B. Holes are cut in the card to
receive the coins C. The frame is placed on bearings so it may be
turned over to examine both sides. If there is a large collection
of coins, the frame can be made in the same manner and used as
drawers in a cabinet. The drawers can be taken out and turned
over.
--Contributed by C. Purdy, Ghent, O.

** How to Make Lantern Slides [220]

A great many persons who have magic lanterns do not use them very
much, for after the slides have been shown a few times, they
become uninteresting, and buying new ones or even making them from
photographic negatives is expensive. But by the method described
in the following paragraph anyone can make new and interesting
slides in a few minutes' time and at a very small cost.

Secure a number of glass plates of the size that will fit your
lantern and clean them on both sides. Dissolve a piece of white
rosin in a half-pint of gasoline and flow it over one side of the
plates and allow to dry. Place the dried plate over a picture you
wish to reproduce and draw the outline upon the thin film. A lead
pencil, pen and ink or colored crayons can be used, as the rosin
and gasoline give a surface that can be written upon as easily as
upon paper. When the slide becomes uninteresting it can be cleaned
with a little clear gasoline and used again to make another slide.
A slide can be made in this way in five minutes and an interesting
outline picture in even less time than that.

This solution also makes an ideal retouching varnish for
negatives.
--Contributed by J.E. Noble, Toronto, Canada.

** How to Make a Developing Box [220]

A box for developing 3-1/4 by 4-1/4 -in. plates is shown in detail
in the accompanying sketch. It is made of strips of wood 1/4-in.
thick, cut and grooved, and then glued together as indicated. If
desired, a heavier piece can be placed on the bottom. Coat the
inside of the box with paraffin or wax, melted and applied with a
brush. Allow it to fill all crevices so that the developing box
will be watertight. It will hold 4 oz. of developer. Boxes for
larger plates

[Illustration: Details of the De