MECHANICS AND USEFUL ARTS. 71 



ease, and in from one tenth to one twentieth of the time required to do 

 finished lithographs in the ordinary chalk method. The editor of the 

 journal vouches for the value of this discovery, which has been already 

 applied quite extensively. 



NEW MODE OF STEREOTYPING. 



PROF. C. C. JEWETT, in developing his plan for stereotyping the 

 catalogues of libraries, referred to elsewhere, described to the Ameri- 

 can Association a new mode of stereotyping, which seems to possess 

 many advantages. It is the invention of Mr. Josiah Warren, of In- 

 diana. The material which he uses for stereotyping costs not more 

 than three cents an octavo page. The process is so simple, that any 

 man of average ingenuity could learn to practise it successfully by 

 two or three days' instruction. The cost of apparatus for carrying 

 on the work on a small scale, bjjt in a workmanlike style, need not 

 exceed $10. The rapidity of execution is such, that one man could 

 produce at least 25 octavo pages a day, all finished and ready for use. 

 The plates will give a beautiful impression. They seem more durable 

 than common stereotype plates ; and, so far as now known or feared, 

 they are not in any greater degree liable to injury. A company of 

 practical printers have purchased the right to use this process in the 

 District of Columbia, after having entirely satisfied themselves of its 

 value ; and they are now stereotyping by it a part of the Patent Office 

 Report. This invention was patented several years ago. But very 

 important improvements have lately been made by the patentee, which 

 have brought it to a high degree of perfection. We understand that 

 the material used is a kind of clay, very abundant in the Western 

 States, which is mixed with oil. We have seen a plate made by this 

 process from which 40,000 impressions had been taken, and yet prac- 

 tical printers declared themselves unable to detect any wear or depre- 

 ciation. Editors. 



BANK OF ENGLAND NOTE. 



AT the meeting of the Royal Institution on Feb. 15, Rev. J. Barlow 

 read an interesting paper on the " Characteristics of a Bank of Eng- 

 land Note," from which we abridge the following. The paper is dis- 

 tinguished, 1. By its color, a peculiar white, such as is neither 

 sold in the shops nor used for any other purpose. 2. By its thinness 

 and transparency, qualities which prevent any of the printed part of 

 the note being washed out by turpentine or removed by the knife, un- 

 less a hole is made in the place thus practised on. 3. By its charac- 

 teristic feel, a peculiar crispness and toughness, by which those ac- 

 customed to handle it distinguish the true notes instantly. 4. The 

 wire or water mark, which is produced on the paper when in the state 

 of pulp, and which is easily distinguished from a mark stamped on 

 after the paper is completed. 5. The three deckle edges. The mould 

 contains two notes placed lengthways, which are separated by a knife 

 at a future stage of the process. The deckle (or wooden frame of the 



