MEMOIR OF DAM! I TREADWKLL 335 



enabled to turn over upon centres; when the sheet is printed on 

 one side and the platen thrown open, the bar, 2, is depressed by the 

 right hand, which raises the double frisket holding the sheet of 

 paper, z; the left hand then instantly turns it over, and the sheet 

 is, by another impression, perfected. 



"There is certainly great originality in the construction of this 

 press: its operations are conducted with much facility by one man; 

 and as the rolling of the table and the horizontal movement of the 



bar are dispensed with, the labor must be considerably redu< d. 



The chief objection which struck me, on a view of it, was the 



room required behind the press, four or live feet more in width than any other press. This, 



in the confined space and value of house-room in London, would, in itself, be a sufficient 



objection." 



Fig. a 



This press excited a good deal of interest among printers. Colonel Benjamin 

 Russell, an old Boston printer, and the well-known editor of the u Columbian 

 Centinel," was much pleased with it, and brought it prominently forward. The same 

 friend, General William II. Sumner, who had aided Mr. Tread well in the screw 

 machine, aided him in this also. The press, when finished, was put in operation in 



Boston for a short time, and worked so satisfactorily that it was determined to 

 bring it into general use. Mr. Treadwell wished to visit England, and decided to 

 make his first attempt there. He sailed for Liverpool on November 6, 1819, and 

 reached London in December. Thence, after making arrangements with Mr. Napier, 

 a prominent manufacturer of printing machines, for the construction of his press, 

 he went to France, remaining there through February and a part of March, when 

 he returned to London. 



His experience in England is related in the following letters from London to his 

 friend and medical instructor, Dr. John Ware, afterwards Hersey Professor of the 

 Theory and Practice of Medicine in Harvard College, and one of the mo.-t eminent 

 of Boston physicians. 



To Dr. John Wari 



. London, January 20, 1820. 



I promised you in my letter dated at Liverpool that you should hear from me again won 

 after my arrival in the great city. I fulfil my promise the more readily that I may put you in 

 possession of my addn s that I may receive from you the good ollice of a letter. I arrived 

 in London on the 7th of December, having left Liverpool on the 3d. My journey was thromrh 

 the heart of the land, which does not appear generally better populated than the sea-board of 

 New England, (I except Birmingham and the great inland towns, of course,) aud I did not 

 notice anything of that appearance of superior comfort of which Englishmen always boast as 



; but my standard of comparison was New England, where com- 



lunej 



