Bibliogi*aphy. 309 



execution of these works leaves little lo be desired, and (he wood-cuts 

 are equalled only by the other volumes of the series of illustrated sci- 

 entific works of which this is one. This volume is devoted to ihe de- 

 tailed description of the process of Glass making in its various depart- 

 ments, and the manufacture of Alum, of Copperas, and of Oil of Vitriol, 

 all of which are subsidiary to Glass making. Groupe in. is devoted to 

 Clay wares, the manufactory of Pottery and Porcelain, including Bricks. 

 Groupe iv. is devoted to Lime, Mortar, Gypsum, Magnesia, Barytes, 

 and Strontia. 



Dr. Knapp's happy union of scientific accuracy with a minute knowl- 

 edge of practical details, renders his works of the greatest value to all 

 who take an interest in the progress of the scientific arts. 



17. The Nautical Slide Rule; by Paul Cameron. 2d edition. Lon- 

 don. 1848. 12mo, pp. 58. — The author of this treatise is the invent- 

 or of an instrument for the use of navigators, which he calls a Nauti- 

 cal Slide Rule, and another which is called the Mechanical Sliding 

 Rule. These instruments appear to be capable of solving instrumen- 

 tally or by construction a large range of practical problems, alike in 

 navigation and general mechanics, and withal to be of a very simple 

 and practical character. 



18. Second Report of Experiments on Gunpowder, made at Wash- 

 ington Arsenal in 1845, '47, and '48 ; by Brevet Major Alfred Morde- 

 cai, of the Ordnance Department. Washington. 1849.— Major Morde- 

 caPs former experiments on Gunpowder and Guns, are well known 

 (see this Jour., i ser., vol. xlix, 180) as having added very greatly to 

 the extent and accuracy of our constants in this difficult department of 

 physical investigation. The following are the principal objects which 



w ere proposed in continuing the experiments with the ballistic pen- 

 dulum : — 



1. To ascertain the smallest calibre of gun which may be relied on 

 t0 give satisfactory results, in using the ballistic pendulum as an instru- 

 ment ^r proving gunpowder. 



See " Report of Experiments on Gunpowder, at Washington Arse- 

 nal, in 1843 and 1844," p. 320. 



2. To ascertain the initial velocities of balls fired from field guns 

 and howitzers, with various charges. 



3. To ascertain the charge of maximum effect, and also the relative 

 force of a given charge, in guns of various lengths of bore. 



4. To extend the experiments on the windage of balls, in order fur- 

 ther to develope the law of variation of the force of the charge, with 

 various windages. 



t» 5 - To extend the experiments on balls of various weights, in order 



to compare the force of the charge, with different weights of ball, in 

 Hs effects on the gun, as well as on the shot. 



19. Craig's Universal Dictionary of the English Language, em- 

 bracing all the terms used in Art, Science and Literature. 2 vols., 8vo. 

 PP. 1053 and 1100. London. 1819.— Mr. Craig is Lecturer on GeoU 

 °gy in Anderson's University, Scotland. This dictionary retains in its 

 "Win features the peculiarities of Walker. Its definitions are full and 

 ^curate, being largely derived from Webster. The orthography and 

 orthoepy f the work are of course deeply tinctured by the Old Eng- 



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