Xaddray Jamgs Thompson

^^clence recognizes the existence of a huge dwave band composed of very short to very long wave lengths. On this band are light rays, radio, X-ray, infra-red ray, death ray, ultra violet ray, to name a few, which have been placed at the service of humanity. Between the known wave lengths, however, exist many, use for which is unknown. It is with these "black gaps" that scientists today concern themselves.

Marconi, at the time of his death, was delving into the mysteries of one of them. Recently a black substance emitting a powerful and baffling ray was compounded by an eminent scientist and chemist.

Fastened in this wooden framework is a small portion of this substance or material which I have been fortunate in securing for purposes of demonstration.

"flease write two digits on this white card an<f hand it to me face down.-----I will place

It, still writing side down, under the framework for a moment, thus, and then lay It over here to one side. The ray has now not only penetrated the white card but has assimilated the value of the numbers written and will reproduce them on Its upper surface. Do you see it forming - faintly of course? You can't? Perhaps If I gave the ray more time to operate the result would be a clearer Image. I'll place the card under again. New look I You still can not see anything? Just a moment. I'll outline the figures for you with chalk. H-m-m, 17. What did you write? 9 and 81 Oh yes, I neglected to mention that the ray adds the numbers written as well. Isn't science wonderful?'*

The simple and few requisites are a single pocket size silicate slate (dealers have them as Vest Pocket Slates) with a flap made of white cardboard covered on one side with black paper. You also have a piece of white cardboard the same size as the flap, and a piece of white chalk. The flap is placed on the slate with the black side outward and the chalk is in the right trouser pocket.

The slate is casually shown on both sides during the patter and dropped lengthwise on the slightly curved left fingers which allows the flap to fall out. The right hand grasps the numbered card at edge and slides It under the end edge of the slate. A moment after it is out of sight the right fingers take slate and card, pinching latter against the frame, left hand moving to left which brings flap into view. This makes a perfect switch. The flap Is laid to one side.

The slate, with card clipped behind, is held vertically before the eyes of the spectator so that he can "see" the faint figures, and this action provides ample opportunity for reading the digits that he has written.

When the flap is placed under the slate for the second time it goes between the card and the slate. This Is done easily because the card is clipped against the frame. The real numbered card then is laid to the right. Mow the slate is held vertioally before the spectator's eyes

(Mr. Dodd and others turn to page 455)

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