It would be advisable, if possible, to have the part of the needle that touches the contact points, as well as these points, of platinum, as the arc that is likely to be formed will not destroy the platinum as easily as it will the brass.  A small wooden containing case can now be made and the thermostat is complete.  There should be a large number of holes drilled in the sides, ends and back of the case so that the air inside may be always of the same temperature as the outside air.

In adjusting, testing, or calibrating your thermostat, make sure that it is in the same position that it will be in when in use.

The connections of the thermostat for ringing one bell when the temperature rises or falls to a certain value, are shown in Fig. 11.  The connections of the thermostat for ringing one bell when the temperature rises to a certain value and another bell when the temperature falls to a certain value, are shown in Fig. 12.  The complete thermostat is shown in Fig. 13.

** A Tailless Kite [458]

The frame of a 3-ft. kite is made of two sticks, each 3 ft. long.  These are tied together so that the cross stick will be at a distance of 15 per cent of the full length of the upright stick, from its end, or in this case 5.4 in.  The sticks may be made of straight grained pine, 3/8 in. square, for small kites, and larger hardwood sticks, for larger kites.

The cross stick is bent into a bow

[Illustration:  Plan and Dimensions for Kite]

by tying a strong cord across from end to end.  The center of the bend should be 4-1/2 in. above the ends.  The bend is shown in the sketch.  Connect all four ends or points with a cord, being careful not to pull the bend of the cross stick down, but seeing that it remains straight across the kite.  When this is done the frame is ready for the cover.

The cover will require 2-1/2 sheets of tissue paper, 20 by 30 in., which should be pasted together as the sketch indicates.  Cut out the paper, allowing 2 in. margin for lapping over the cord on the frame.  Place the frame on the cover with the convex side toward the paper and paste the margin over the cord, allowing the paper to bag a little to form pockets for the air to lift the kite.  The corners should be reinforced with circular pieces of paper pasted over the ends of the sticks.

The flying cord is attached to the points A and B of the frame.  There is no cross cord.  The kite will fly at right angles to the flying cord.  It is easily started flying from the ground by laying it with the head toward the operator and pulling it up into the wind.  —­Contributed by Chas. B. Damik, Cooperstown, N. Y.

** The Levitation — A Modern Stage Trick [459]

This illusion has mystified thousands of the theater-going public, in fact, it has been the “piece de resistance” of many illusion acts.  The ordinary method of procedure is as follows:  The person who is to be suspended in the air, apparently with no support—­usually a lady—­is first put in a hypnotic (?) sleep.  She is placed on a couch in the middle of the stage, and in most cases the spotlight is brought into play.  The performer then takes a position close to the couch and with dramatic