448 



New Patents and Mechanical Inventions 



[June 1, 



it may be better calculated to bear an 

 extraordinary strain without breaking, 

 than a chain of equal weight of metal 

 on any other construction. This is 

 effected by placing a piece of metal 

 across each link to keep its sides from 

 collapsing, when the chain is drawn 

 with any extraordinary force. Two 

 methods arc proposed for this purpose : 

 1st. by raising on the pieces or bars of 

 which each link is formed, conical pro- 

 jections, which when the bar is turned 

 round and welded together into an el- 

 liptical link, will meet in the middle. 

 The 2d mode is, where (he projections 

 are not sufficiently raised to meet when 

 turned into a link; it is then proposed 

 to form cups to receive the points of a 

 spindle- fornied stay, which is intro- 

 duced when the bar is welded together 



info a link, to prevent tlic collapsing 

 of the sides.- 



Oljservnlion.i, Without entering into 

 the actual merit of the patentee's hivcn- 

 tion, or at all considering the ques- 

 tion of its relation as to other chain 

 cables for which patents are held, we 

 apprehend this to be a case, in which 

 the title of the patent, (which describes 

 the thing for which the grant is made, 

 and the mode of performing, which tlie 

 patentee is bound to disclose in his 

 specification,) does not accurately 

 enough desciibe the real obje(;t of the 

 patent ; wliicli is not, (as in the terms 

 of the title) to " improve the process 

 of forming tlie materials," but (as in 

 tlie terms of the descriptive specifica- 

 tion) to make an improved chain 

 cable. 



MR. THOS. JOHN COLLEY'S LITHOGRAPHIC PRESS. 



We liavc to announce a further im- 

 provement in presses for Lithographic 

 printing, by Mi: Thos. Joh?J Colley ; 

 and at the Lithographic establishment 

 of Mr. Ch.\rles M. Willich, No. 6, 

 Dartmouth-street, Westminster, there 

 are already two on this construction at 

 work. 



We anticipate, from the simplicity 

 of this machine and itslowness of price, 

 a considerable extension of the art of 

 JUhography. '' 



On the carriage with the stone being 

 placed under the upper roller, and tlio 

 lever being depressed, the lower cylin- 

 der is raised without any exertion, by 

 a very simple contrivance, and any de- 

 gree of re(iuired pressure may thus be 

 instantly given. The winch handle 

 winds the carriage through, and by 

 lifting the lever lip the pressui-e is dis- 

 engaged, and it is at liberty to l)e with- 

 drawn. It lias therefore no intricacy 

 '■rpaTrs;"'«. 



Tin- 



