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LXII. Nolices respecting New Books, 



Xt has often been remarked as a singular circumstance, 

 that during the last half century, while the practice of 

 mechanics and the structure and operation of machines 

 have received so many and such valuable improvements in 

 this country, we have only had one treatise (that by Emer- 

 son) into which we can look for information both on the 

 theory and the actual construction of machinery. Mr. 

 Gregory, of the Royal Military Academy, Woolwich, has 

 endeavoured to supply the deficiency just adverted to, and 

 has now in the press a General Treatise of Mechanics, 

 which is intended to be comprised in two volumes octavo. 

 The first volume will be devoted chiefly to the theory, and 

 will be divided into five books, under the several heads 

 of Statics, Dynamics, Hydrostatics, Ilydrodvnamics, and 

 Pneumatics. The second volume will be chiefly appropri- 

 ated to the description of machinery, and will conunenct; 

 with some practical remarks on the application, improve- 

 ment, and snnplification of mechanical contrivances ; on 

 friction, the stiffness of ropes, the energy of different first 

 movers, &c. And these will be followed by accounts, ar- 

 ranged alphabetically, of about one hundred of the most 

 curious, useful, and important machines. Tn this latter 

 part Mr. Gregory has been promised the assistance of some 

 celebrated civil engineers ; and the alphabetical arrange- 

 ment (the only unfinished part of the work) will be com- 

 pleted in the course of the month of July, w'lcn he hopes 

 he shall have received the communications of these gentle- 

 men, or of any others who may favour him with descrip- 

 tions of new and useful machines. The work is intended 

 to be published before tiic end of the present year. 



LXII I. Proceedhigs of Learned Sodetics. 



ROVAL SCCIETY OF LONDON. 



JL HE Transactions of the Society for 180.5, Part T., fiave 

 just appeared. This Part contains : — The Croonian Lec- 

 ture on muscular Motion. By Anthony Carlisle, Esq. 

 F. R. S. — Experiments for ascertaiuing how fajr Telescope-; 

 will enable us to determine very small Angles, and to di- 

 stinguish the real from the spurious Diameters of celestial 

 and terrestrial Objects : with an Application of the Result 



of 



