rcle and cut the disk in two as shown in Fig.
2. These half circle pieces are soldered to the sides of the teeth
of the half circle made in the long piece of tin. Remove one end
from the inside box containing matches and slip the back of the
match safe through between the bottom of the inside box and the
open end box that forms the cover. The matches will fall into the
half circle tray at the lower end of the box which will be kept
full of matches until they are all used from the box.
--Contributed by C. F. White, Denver, Colo.

** An Electric Post Card Projector [195]

A post card projector is an instrument for projecting on a screen
in a darkened room picture post cards or any other pictures of a
similar size. The lantern differs from the ordinary magic lantern
in two features; first, it requires no expensive condensing lens,
and second, the objects to be projected have no need of being
transparent.

Two electric globes are made to cast the strongest possible light
on the picture card set between them and in front of which a lens
is placed to project the view on the screen, the whole being
enclosed in a light-tight box. The box can be made of selected oak
or mahogany. The lens to be used as a projector will determine the
size of the box to some extent. The measurements given in these
instructions are for a lens of about 5 in. focal length. The box
should be constructed of well seasoned wood and all joints made
with care so they will be light-tight.

The portion shown carrying the lens in Fig. 1 is made to slide in
the main body of the lantern for focusing. A box should first be
made 5-1/2 in. wide, 5-1/2 in. high and 11 in. long. A hole is cut
in the back of the box 4 by 6 in. represented by the dotted line
in Fig. 2. This will be 3/4 in. from the top and bottom and 2-1/2
in. from each end of the outside of the box. Two strips of wood
1/2 in. wide and 6-1/2 in. long are fastened along the top and
bottom of the back. The door covering this hole in the back, and,
which is also used as a carrier for the post cards, is made from a
board 4-1/2 in. wide and 6-1/2 in. long. The door is hinged to the
lower strip and held in position by a turn button on the upper
strip. The slides for the picture cards are made from strips of
tin bent as shown, and tacked to the inside surface of the door.

The runners to hold the part carrying the lens are two pieces
2-1/4 in. wide by 5 in. long and should be placed

[Illustratio