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Typo: A Monthly Newspaper and Literary Review, Volume 6

Inventions, Processes, and Wrinkles

page 14

Inventions, Processes, and Wrinkles.

An Envelope Book, according to Paper and Press, is a recent invention. A series of separably detachable envelopes, having their mouths at their inner ends, and provided with closing flaps beyond the latter, are attached to extension binding-pieces, constituting stubs, detachable from the flaps, and bound with the envelopes in the books.

Coating for Blackboards.—A writer in the Scientific American says:—Being a teacher, I give you my experience in making a blackboard with velvety surface. It is as near perfection as can be; I have used it for years. Take equal parts by weight of Prussian blue, powdered, and of chrome green, powdered; mix well. For liquid, use gilders' sizing (solution of shellac in alcohol), thinned with one-half of alcohol; mixed with part of combined dry powder to the thickness of cream. Use large and stiff brush; cover quickly. In a day or two smooth the surface with hair-cloth. This covering will never look gray, as that with lampblack will.

Pictures in Sulphur.—A writer in the Scientific American says: In demonstrating that sulphur melted at about 115° can be cooled in paper, the author happened to use a lithographed card, of which the edges were turned up. Upon taking away the card he discovered that the lithographed characters were clearly and distinctly impressed upon the cooled surface of the sulphur, and remained after hard friction and washing. By repeated experiments he has been able to get very fine results, removing the paper each time by a mere washing and rubbing process. He finds that sulphur will receive impressions from and reproduce faithfully characters or designs in graphite, crayons, writing-ink, typographical inks, china ink, lithographic inks, &c. It will reproduce, with remarkable exactitude, geographical maps. [But he does not mention that it will reverse them!]

Contrivance for Angular and Register Work.—The AUgemeiner Anzeiger für Druekereien, which makes a point of illustrating new patents, shows a most ingenious invention for register-work and also for securing pages or lines at various angles to the rest of the matter, for which purpose we think it will go far to supersede the angle quads in ordinary use. The invention consists of a short piece of metal furniture, the sides being connected by a screw, which enables the piece to be widened or contracted by infinitesimal degrees. Where a register form is slightly out of place, it is a much simpler matter to turn a pair of these screws with the lever provided, than to lift out and change the leads or other justifiers. For angular work, the furniture is so contrived, that by turning the screw the sides diverge from the parallel position to any angle required; and thus in the midst of a rectangular form an oblique line may not only be securely fixed, but the angle may be varied when required for register or other purposes, in a manner not possible by any previous method. The inventor of this useful and ingenious contrivance is Herr J. Curitz, of C. Grumbach's printing-house, Leipzig.