MECHANICAL AND USEFUL ARTS. 103 



dated Ipswich, Dec. 23, 1860, set the matter right by the publi- 

 cation of a letter from Dr. Faraday, and Sir Roderick Murchison, 

 both showing that two bays on the river front of the Houses of Par- 

 liament have been prepared, one by the Szerelmey process, and the 

 other by Itansome's ; and agreeing that at the time the bays were 

 examined (soon after their preparation), the Szerelmey stone was less 

 absorbent of water than the Ransome, and had then the most perfect 

 and uninjured surface ; but that, 2. "the result looked for is emi- 

 nently practical, and in either case can only be obtained by the lapse 

 of time." 



IMPROVED PRINTING MACHINERY. 



Mr. A. Applegath has patented certain improvements in 

 Machinery for Printing and for cutting printed paper into sheets. 

 In combining a machine for these purposes, two surface-printing 

 rollers are used between two pairs of cylinders, each covered with 

 blanketing ; to prevent as much as may be the effect of set-off on 

 such cylinder, where the already printed paper comes in contact with 

 the cylinders, they are each made of two or more times the circum- 

 ference of the printing surface rollers ; and further, to prevent the 

 effects of set-off, each cylinder may be provided with moveable blan- 

 keting on the inside capable of being moved a short distance over 

 the exterior surface of the cylinders from time to time, in order to 

 bring up fresh quantities of the blanketing. The combination of 

 the surface-printing rollers, then, and the cylinders is so arranged 

 as to admit of two webs or lengths of paper being simultaneously 

 printed on both sides ; the paper, after receiving an impression on 

 one side, passes over or against rollers with endless or other blan- 

 keting or absorbing material, so as to have any superfluous ink or 

 colour removed from the impression before the paper is printed on 

 the other side ; and after such second impression it is also subjected 

 to the action of like absorbing apparatus before passing to the cutting 

 apparatus. The cutting apparatus consists of a cylinder coated 1 with 

 a material into which puncturing or cutting points or blades may 

 penetrate ; such puncturing cutters are so set on rollers that the 

 puncturing of one roller shall be intermediate of the other or others, 

 so that when the paper has passed the rollers it shall be divided 

 across. The printed paper thus divided is delivered at several dif- 

 ferent places by carrying tapes or aprons on rollers, in such manner 

 that one pair of delivering tapes or aprons may (by one pair of the 

 rollers by which the tapes or aprons are carried) be arranged so as 

 to move from and to two or more sets of carrying tapes. — Mechanics' 

 Magazine. 



TYPE- COMPOSING MACHINERY. 



Mr. G. Davis has patented an improvement consisting princi- 

 pally in the use in Typographic, Lithographic, and Copper and other 

 plate Printing Presses of endless paper in place of separate sheets ; 

 also, in damping the paper by automatic apparatus. The endless 

 paper is passed around rollers which keep it at the requisite tension, 



