eted together. The support for the
dial is soldered to the brass plate.

The hasp, if that be the name for the double toothed arrangement
that catches into the lock, was to be secured by only three brass
screws, which seemed to be insufficient, says a correspondent of
the Metal Worker; therefore a piece of heavy tin was formed over
the front of the trunk, which is only 3/8-in. board, the hasp
tinned and soldered to the back of the now U-shaped tin, and the
tin placed over the board and all fastened in position. The tin is
4 in. wide, 16 in. long and when placed over the board, it laps
down about 8 in. between the boards, and the same distance inside
of the new board, as shown by the heavy line in the cross section,
Fig. 1. Wrought nails are used which pass twice through the tin
and both boards, and then well clinched. The three screws were
then put in the hasp.

The knob on the dial extends out too far, which may be filed off
and two holes substituted, as shown, with which to operate the
dial. An old key is filed down in the shape shown in Fig. 2 to fit
the two holes.

As the dial is convex it will need protection to prevent injury by
rough handling. A leather shield may be used for this purpose,
which is cut with two holes, one for the key and the other to
permit the operator to observe the numbers on the dial. The shield
answers a further purpose of preventing any bystander from noting
the numbers on the dial.

** AN ELECTRIC ILLUSION BOX [135]

The accompanying engravings show a most interesting form of
electrically operated illusion consisting of a box divided
diagonally and each division alternately lighted with an electric
lamp. By means of an automatic thermostat arranged in the lamp
circuit causing the lamps to light successively, an aquarium
apparently without fish one moment is in the next instant swarming
with live gold fish; an empty vase viewed through the opening in
the box suddenly is filled with flowers, or an empty cigar box is
seen and immediately is filled with cigars.

These electric magic boxes as shown are made of metal and oxidized
copper finished, but for ordinary use they can be made of wood in
the same shape and size. The upper magic boxes as are shown in the
engraving are about 12 in. square and 8-1/2 in. high for parlor
use and the lower boxes are 18 in. square and 10-1/2 in. high for
use in window displays. There is a partition arranged diagonally
in the box as shown in the pla