plate may be as business. Some cling to old methods, and are satis- written on the cloth at the rear of the frame is made to brought {into position for exposure by releasing the fied with the way things were done years ago; but come to the front in plain view. (Fig. 3.) reel and turning it through… … on slates, under what is known as ‘‘severe test condi- it; and, upon again showing that side of the slate first tions” that preclude, beyond any possible doubt, any cleaned, it is found covered with writing apparently form of deception or trickery, one would think that the done with chalk. The…
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