Those who would wish to have a little extra shop window attraction by
way of displaying slides for the season now at hand might do worse
than resort to something of the following style. The appliance can
hold any number of slides, according to the diameter of the wheel
portion, but in the diagram herewith it is for holding a dozen. The
slides can be changed readily, hence a little time would be expended
in making a complete change at least once a day.
[Illustration: FRONT ELEVATION.]
The relative portions of the sketch being to scale, particulars as to
the making of the revolving wheel need not be entered into, as any
mechanic could grasp the whole idea at a glance. The edge of the wheel
should, of course, be placed facing the window, and a band on the
pulley wheel, A, attached to a clockwork or electric motor would
supply all the driving power necessary.
In order to get good illumination on the slides, it will be necessary
to have a piece of white cardboard or opal glass, B, hung on the axle,
the lower side being the heavier, so that although the wheel revolves,
it will remain stationary.
Various devices may be resorted to for hanging the slides on the cross
rods, but perhaps the method shown at C will prove as simple as any,
and consists of small springs which grip the slide at both sides.
[Illustration: SIDE ELEVATION.]
By the judicious arrangement of shielded lights placed at side of
reflector, a pretty effect is produced as each slide is gradually
brought to view.--The Optical Magic Lantern Journal and Photographic
Enlarger.
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