Several contrivances for facilitating press operations have been invented. We may mention Megill’s Patent Gauge Pin, of sizes suitable for various margins. Two small teeth, projecting from the lower side of the head of the pin, press into the tympan sheet and prevent the gauge from moving. There is also the Extension Feed-Guide, which furnishes a gauge below the edge of the platen, and is held firmly in place by the tympan-clamp. [Illustration: HART’S COUNTER.] When long numbers are printed, the Automatic Counter may be attached to the press. It counts only when the form is being printed, and shows the exact number in plain figures up to 100,000. Several styles of counting machines are made. [Illustration: PATENT INK FOUNTAIN.] An ink fountain has been contrived for attachment to the Gordon job press, or any other press with similar plate distribution. It is quite a cosey little thing, and is operated by the impression arm of the press. Iron furniture is made in sets containing twenty-one pieces, adapted for use on the eighth, quarter, and half medium job presses. [Illustration] USEFUL RECEIPTS.[22] _Printers’ rollers._—10 lbs. French or Irish heavy glue, 12 lbs. sugar or good quality molasses, and 3 lbs. glycerine. This will be sufficient to make two rollers twenty-nine by three and one-half inches, and can be readily recast by following the directions given for recasting rollers. DIRECTIONS.—Soak the glue the necessary length of time that will enable it to melt with ease. After being melted, add the glycerine, and boil fifteen minutes or until thoroughly mixed, when the sugar or molasses may be added. Cook and stir continuously for fifteen minutes, the composition will then be ready for pouring. Strict attention should be given that the moulds be thoroughly cleansed and evenly oiled previous to pouring. * * * * * _German Preservative for Rollers._—Corrosive sublimate 2 drachms, fine table salt 2 oz.; put together in half a gallon of soft water—let it stand twenty-four hours. When rollers are clean washed with ley, sponge them with the above mixture twice a week. * * * * * _Directions for Recasting Rollers._—Sponge the face of the roller with hot water; scrape off the face thoroughly with a knife; take the composition off the stock and cut it up small. If the roller has been used only a short time, it may be melted about as readily as new composition; if it is older, put it in a sieve or basket and soak it in cold water for about fifteen or twenty minutes; take it out of the water, cover with a damp cloth, and leave over-night; then melt as usual. If composition is too hard, wait till it is melted, and stir in a sufficient quantity of common molasses; avoid heavy, clarified syrups. * * * * * _Printers’ Ley._—No. 1.—Dissolve 28 lbs. of soda in 52 gallons of water, to which add 7 lbs. of soft-soap, boiled. Stir well together.