BARREL MACHINERY. E. & B. HOLMES, BUFFALO, N.Y.

THE COPYING PAD.—HOW TO MAKE and how to use; with an engraving. Practical directions how to prepare the gelatine pad, and also the aniline ink by which the copies are made; how to apply the written letter to the pad; how to take off copies of the letter. Contained in Scientific American Supplement, No. 438. Price 10 cents. For sale at this office and by all newsdealers in all parts of the country.