508 SEC. 13. CHEMISTRY. 



2443. Apparatus for Volumetric Analysis. 



James How 3? Co. 



2444. Series of ^-inch cardboard cubes, with different colour 

 for each chemical element on which its symbol, atomicity., and com- 

 bining weight are marked, illustrating the laws of chemical 

 combination and the binary theory of Salts. 



Rev. Nicholas Brady, M.A. 

 Only a comparatively small number are sent, as they will sufficiently show 



their method of use, thus H 



H 



represents the molecule of water, 



the dyad oxygen requiring two monads to satisfy it, the chemical equivalent 

 of the compound being 1 + 1+16 = 18. 



2445. Lecture-Boom Diagrams of Alkali Works and 

 Sulphuric Acid Plant. In 4 sheets. 



Professor Roscoe, F.R.S. 



I. Sulphuric Acid Plant. 



Sheet No. 1. General plan, showing the arrangement of the most modern 

 form of sulphuric acid plant, drawn to scale, with descriptions. 



Sheet No. 2 contains a longitudinal section of the apparatus and chambers 

 on the line C D, sheet No. 1. 



Sheet No. 3 contains a sectional elevation of the same apparatus on the 

 line A B, sheet No. 1. 



Details on sheet No. 2 and sheet No. 3 show various points of importance 

 on an enlarged scale. 



No less than 850,000 tons of sulphuric acid were made last year in Great 

 Britain. The diagrams show the most approved method for the manufacture 

 of this important acid, together with the best arrangement of the plant, and 

 are so fully numbered and explained that further description appears unneces- 

 sary. 



II. Alkali Works. 



Sheet No. 4 is an enlarged plan of a model alkali works, showing the best 

 arrangement of the various portions of the works ; also fully lettered and 

 numbered. As in the above case a description appears unnecessary. 



2446. One-inch Solid Flame Bunsen Burner and two 

 Perforated Caps, the fine one for ordinary use, and the coarse 

 one to exhibit the green beads above each perforation more dis- 

 tinctly. John Wallace, Messrs. Tangye Bros., and Rake. 



2447. Two-inch Solid Flame Bunsen Burner, with a piece 

 of sheet platinum suspended across the top of the cap in order to 

 show by its incandescence that the flame is solid to the centre. 

 These burners will burn safely a mixture of 4-^ volume olteir per 

 volume of gas. 



John Wallace, Messrs. Tangye Bros., and Rake. 



By the addition of a perforated metallic cap, adjustable to various heights 

 on the burner tube, the ordinary Bunsen burner may be increased to 2'' or 

 more in diameter, while at the same time the combustion is greatly improved 



