New Patents. 157 



science? Well may collectors complain that the world is dead 

 to tlie science — well may dealers complain that they have no 

 inducement to collect — when the science is suffered to die away 

 for want of encouragement from those who ought to promote it by 

 the dissemination of that information which they possess. 

 I remain, yours, &c. 



An Old Correspondent. 



Analysis of a specimen of Tennanfiie from Trevisane Mine in the 

 parish of Gwennap, in Cornwall. By J. Hemming, Esq. Vice- 

 President of the London Mechanics' Institution, and Lecturer at 

 that Institution, and also at the Russell and London Institutions. 



Silica 5 



Copper 4'8-4 



Arsenic 11'5 



Iron 14-2 



Sulphur 21-8 



99-19 

 Can any of your Correspondents give any account of the che- 

 mical tests for the new metal ' Vanadium' ? or the process by which 

 Mr. Johnstone discovered what he calls the Vanadiate of lead, from 

 the Lead Hills, and, as he says, Alston Moor,— but more probably 

 from the neighbourhood of Keswick? 



[Mr. Brooke seems to have anticipated our correspondent's com- 

 plaint, as will appear from the present Number. A notice of Vana- 

 dium will be found in p. 151.— Edit.] 



LIST OF NEW PATENTS. 

 To C. M. Hannington, Nelson Square, Surrey, gentleman, for 

 an improved apparatus for impressing, stamping, or printing, for 

 certain purposes. — Dated the 22nd of January 1831. — 6 months 

 allowed to enrol specification. 



To L. Schwabe, Manchester, manufacturer, for certain processes 

 and apparatus for preparing, beaming, printing, and weaving yarns 

 of cotton, linen, silk, woollen, and other fibrous substances, so that 

 any design, device, or figure, printed on such yarn, may be preserved 

 when such yarn is woven into cloth or other fabric. — 22nd of 

 Januarj'. — G months. 



To R. Winch, Gunpowder Alley, Shoe Lane, London, printer's 

 joiner, for certain improvements iii printing machines. — 29th of 

 January. — 6 months. 



To .). Bates, Bishopsgate-Street Within, London, esq., for cer- 

 tain improvements in refining and clarifying sugar. Communicated 

 by a foreigner. — 31st of January. — G montiis. 



To J. C. Schwieso, Regent-street, London, musical-instrument 

 maker, for certain im|)rovements on piano-fortes and other stringed 

 instruments. — '.^nd of February.— (> months. 



LUNAR- 



