466 New Patents. 



sulphovinates only differ in the latter containing some aethereal oil, 

 which in some way acts the part of water of crystallization. It is 

 evident that the properties of oil of wine cannot be thus explained ; 

 and it appears to me more probable that the power of combination 

 which hydrocarbon is shown to be possessed of in oil of wine is effective 

 in neutralizing half the acid of the salts formed from it (sulphovinates) 

 as before described.' " 



TEST OF THE PRESENCE OF AMMONIA. 



M. Plessin having occasion to ascertain whether the action of a 

 salifiable base upon a body containing azote was simply that of 

 evolving ammonia previously existing, or that of forming ammonia by 

 combination, endeavoured to find a base, which would effect the 

 former object but not the latter. Potash, lime, magnesia, and many 

 other bodies, do both 5 but the hydrated oxide of lead answered the 

 purpose very well. It gives no indication of ammonia when put into 

 contact with azotated substances, not containing that alkali 5 even 

 urea is not effected by it j but being put in contact with an ammoniacal 

 salt, ammonia was instantly evolved, and rendered evident by the 

 visible fumes which arose upon the approximation of a little acetic 

 acid. — Annates de Chimie, xxxvi. p. 377. 



LIST OF NEW PATENTS. 



To Jane B. Lowrey, wife of T. S. Lowrey, of Exeter, for her im- 

 provements in the manufacture of hats and bonnets. — Dated the 25th 

 of March 1828. — 6 months allowed to enrol specification. 



To E. Cowper, of Clapham-road Place, Lambeth, for improvements 

 in cutting paper. — 26th of March. — 6 months. 



To F. de Fourville, of Piccadilly, for improvements on filtering ap- 

 paratus. — 26th of March. — 6 months. 



To T. Lawes, of the Strand, for an improved thread to be used in 

 the manufacture of bobbin net lace. — 29th of March. — 6 months. 



To H. Marriott, of Fleet-street, and Augustus Siebe, of Princes- 

 street, Leicester-square, for certain improvements in hydraulic ma- 

 chines. — 29th of March. — 6 months. 



To Peter Taylor, of ttollinwood, Lancaster, for certain improve- 

 ments in machinery for hackling, dressing or combing flax, hemp, 

 &c. — 29th of March. — 6 months. 



To John Davis, of Leman-street, Goodman's-fields, for an improve- 

 ment (communicated from abroad) in boiling or evaporating solutions 

 of sugar and other liquids. — 29th of March. — 6 months. 



To C. Harsleben, of New Ormond-street, Esq., for improvements 

 in machinery to be used in navigation and the propelling of ships. — 

 3rd of April. — 6 months. 



To S. W. Wright, of Webber-street, Lambeth, engineer, for im- 

 provements in the construction of wheel carriages. — 15th of April. — 

 6 months. 



To J. G. Ulrich,of Cornhill, for his improvements on chronometers. 

 19th of April.— 6 months. 



SCIENTIFIC 



