MECHANICS AND USEFUL AKTS. 107 



movement presents it at the top again, when the printed sheet is removed 

 and another laid on. The three forms, one form upon each side and one form 

 beneath, move up simultaneously against the three faces, while the hand of 

 an attendant is occupied in changing the paper on the fourth. The inking 

 rollers, of which, of course, a separate set is provided for each form, perform 

 their duties admirably, moving once backward and forward over the form, 

 while the paper cylinder is changing positions. The " register" of this press 

 is perfect a point of the first importance in color printing, as the slightest 

 misplacement of an impression frequently ruins what would otherwise be a 

 fine etfect. The work is performed rapidly and well, yet without violent mo- 

 tions or concussions, and the number of inks employed is three, although by 

 a trick well known to the craft allowing some lines to receive the full and 

 perfect impressions, thus superposing one color upon another, six actual 

 varieties may be produced. 



Jones's Typographer. This machine, the invention of Mr. John Jones, of 

 Clyde, Wayne Co., N. T., differs essentially from other printing apparatus, 

 except that the appearance of the work produced is nearly the same. The 

 typographer, in short, is an invention by which cards, notes, envelops, etc., 

 may be printed by a slow process of producing one letter at a tune, as in or- 

 dinary writing. The machine is light and portable, and may be placed on or 

 within any ordinary writing desk. The paper to be printed is wound upon a 

 small cylinder, and is fed forward by suitable automatic mechanism. A hor- 

 izontal ring or wheel, of about twelve inches diameter, is fixed on a vertical 

 shaft, with liberty to revolve freely, and also to move vertically. To the cir- 

 cumference of this ring are attached, at equal distances, all the letters of the 

 alphabet in succession, with the addition of numerals and capitals. The faces 

 of all these types are directed downward, and the paper cylinder is so placed 

 underneath that, on depressing a lever connected with the type wheel, the 

 paper receives a distinct impression from one, and one only, of the types, and 

 by moving the lever horizontally in either direction, any required letter may 

 be thus produced. To insure accuracy of position hi this respect, and also to 

 facilitate rapid manipulation, a device has been adopted, consisting substan- 

 tially of a stout ring of cast-iron fixed on suitable standards, just exterior to 

 the type-wheel, and having its upper surface filed into plain triangular notches, 

 to receive the lever when depressed. Each notch corresponds with a letter 

 or figure on the type- wheel ; and to aid the hand in finding correctly the true 

 position before depressing the lever to the point of actual contact between the 

 type and the paper, the lever is made double, the lower portion being held by 

 a delicate spring so much lower than the hand that it falls readily into the 

 notch, and guides the upper or true lever in its descent. The machines com- 

 plete can be manufactured at a price which will allow of their employment 

 for children's toys, and perhaps nothing can well be devised to be more in- 

 structive and entertaining to a vigorous and ingenious boy than the possession 

 of such an "instrument. The inking is performed by two small rollers, which 

 are continually pressed against the lower surface of the type- wheel, and neces- 

 sarily distribute the ink by every horizontal movement of the lever. 



Davis's Oscillating Printing Press. A press, highly recommended, has been 



