318 Additions to Prof. Ham's Communications. 



ntion, that I am induced to insert these hasty and imperfect 

 observations. In time I hope to be able to contrive instru- 

 ments to give the exact proportions or breadth and intensity 

 of each colour, in the spectrum, and also so to adapt the prism 

 to the object glass of the telescope, as more completely to 

 separate the different sorts of rays*. Meanwhile anv hints or 

 collateral observations, communicated through the Philoso- 

 phical Magazine, will oblige, &c. 



Harwell, E. Grinstead, March 13, 1824- T. FoRSTER. 



Additions to Professor Hare's Paper. 



A duplicate copy of Professor Have's communication (Art. XXXIX.), 

 nt the beginning of the present Number, containing some additions, having 

 reached us after it was printed, we give them separately : 



P. 244, line 31, after screw — add, " There is a scale, with a vernier, at- 

 tached to one since made." 



P. 244 Notef , reaa, " 1 have seen it strike at the distance nearly of a 

 quarter of an inch." 



P. 245, add as a note to the account of the Electrometer the following : 

 " If one of the condensing disks be of copper, the other of zinc, they may 

 serve for the purpose of condensing, when not made to touch. If brought 

 into contact, and then separated, the phenomenon will be the same as that 

 in the instance of the Electrometer above described. 



LIST OF NEW PATENTS. 



To Jean Henry Petelpierre, of Chalton-street, Somers Town, in the 

 parish of St. Pancras, Middlesex, engineer, for his engine or machine for 

 making the following articles from one piece of leather without any seam 

 or sewing whatever ; that is to say, all kinds of shoes and slippers, gloves, 

 caps and hats, cartouch boxes, scabbards and sheaths for swords, bayonets 

 and knives. — Dated 20th March 1824, — 2 months allowed to enrol speci- 

 fication. 



To James Rogers, of Marlborough, Wilts, surveyor, for his method, or 

 an improved instrument or instruments for determining or ascertaining the 

 cubic contents of standing timber.— 20th March. — 6 months. 



To John Lingford, of Nottingham, lace machine manufacturer, for cer- 

 tain improvements upon machines or machinery now in use for the purpose 

 of making that kind of lace commonly known or distinguished by the name 

 or names of bobbin-net or Buckinghamshire lace net. — 20th March. — 

 6 months. 



To John Heathcoat of Tiverton, Devonshire, lace manufacturer, for his 

 improvements in certain parts of the machinery used in, spinning cotton, 

 wool or silk. — 20th March. — 6 months. 



To Henry Berry of Abchurch-lane, London, merchant, for certain im? 

 provements on a machine or apparatus for m'ore readily producing light. 

 20th March. — 6 months. 



To Jean Jacques Stainmare, of Belmont distillery, Wandsworth-road, 

 Vauxhall, in the parish of St. Mary, Lambeth, Surry, distiller, who,in conse- 

 quence of communications made to him by certain foreigners residing 



* I have, since writing the above, contrived a method of measuring the 

 proportionate deviation in each instance; see the continuation from my 

 paper. 



abroad, 



