104 



the Society the best method of making candles 

 of icsin, or any other substance, fit for common 

 use, at a price much inferior to those made of 

 tallow only; the gold medal, or thirty guinea-. 

 Six pounds at least of the candles so prepared, 

 vrith an account of the process, to be delivered 

 to the Society on or bttfdfe the first Tuesday in 

 December, 1802. 



75. Method of separating; Sugar in a 

 SOLIdForm fRomTreacle. Tothe person who 

 shall discover to the Society the best method of 

 separating sugar from treacle in a solid form, 

 at such an expense as will render it advantage- 

 ous to the public; the gold medal, or fifty gui- 

 neas. A quantity of the sugar so prepared in a 

 solid form, not less than thirty pounds weight, 

 "with an account of the process, and certificates 

 that not less than one hundred weight has been 

 prepared, to be produced to the Society on or 

 before the first Tuesday in February, 1803. 



76. PROOF-SPIRIT. To the distiller who, 

 in the year 1802, shall make the greatest quan- 

 tity, not less than one hundred gallons, of a clean 

 marketable spirit, from articles not the food of 

 man or cattle, equal in strength or quality to the 

 proof-spirit now in use, and at a rate not higher 

 than the spirit produced from corn or molasses; 

 the gold medal, or one lmndred guineas. Ten. 

 gallons of the spirit, together with proper certifi- 

 cates, and a full account of the expense and mode 

 of making it, to be produced to the Society on or 

 before the first Tuesday in January, 1805. 



77. Increasing Steam. To the person who 

 shall invent and discover to the Society a me- 

 thod, verified by actual experiments, of increas- 

 ing the quantity or force of steam, in steam- 

 engines, with less fuel than has hitherto been 

 employed, provided that in general the whole 

 amount of the expenses in using steam-engines 

 may be considerably lessened ; the gold medal, 

 or thirty guineas. To be communicated to the So- 

 ciety on or before the first Tuesday in Jan. 1803. 



78. Substitute for Tar. To the person 

 ■who shall invent and discover to the Society the 

 best substitute foi Stockholm tar, equal in all its 

 properties to the best of that kind, and prepared 

 from materials the produce of Great Britain; the 

 gold medal, or one hundred guineas. A quan- 

 tity of the substitute, not less than one hundred 

 •weight, with certificates thai at least one ton has 

 been manufactured, and that it can be afforded 

 at a price not exceeding that of the best foreign 

 tar, together with an account of the process, to 

 be delivered to the Society on or before the first 

 Tuesday in March, 1803'. 



79. Preparation of Tan. To the person 

 "who shall prepare in the most concentrated form, 

 so as to be easily portable, and at a price appli- 

 cable to the purposes of manufactures, the largest 

 quantity, not less than one hundred weight of 

 the principle called by the French tannin, which 

 abounds in oak-bark and many other vegetable 

 s distances; the gold medal, or fifty guineas. 

 Certifiiates of the above quantity having been 

 prepared, and a sample of not less than 28 lb. to 

 be produced to the Society ou yr before the last 

 Tuc«-lay in January, 1803. 



Premiums in Chemistry, &V. 



SO. Preparation op a rrd- Stain for 

 cotton Cloth. To the person who shall com'^ 

 municate to the Society, the cheapest and most 

 effectual method of printing or staining cotton 

 cloths with a red coUmr, by an immediate appli- 

 cation of the colouring-matter to the cloth, 

 equally beautiful ami durable with the red co- 

 lours now generally procured from decoctions of 

 madder; the gold medal, or thirty guineas. 

 Certificates that the above process has been ad- 

 vantageously used on ten pieces of callico^ each 

 twenty-one yards or upwards in length, one 

 piece of the callico so printed, a quart of the co- 

 lour in a liquid state, and a full account of the 

 preparation and application, to be produced to 

 the Society on or before the second Tuesday in 

 January, 1803. 



81. Preparation of a green Colour 

 for printing cotton Cloth. To the person 

 who shall communicate to the Society the best 

 and cheapest method of printing with a full 

 green colour on cotton cloth, by an immediate 

 application of the colouring-matter from x 

 Cooclen block to the cloth, equally beautiful and 

 durable as the colours now formed from the 

 complicated process of the decoction of weld 

 on alumme and the solutions of indigo by earths 

 or alcaliue salts; the gold medal, or thirty gui- 

 neas. Cetlificates and conditions as for premium 

 80. 



82. Substitute for the Basis of Paint. 

 To the person who shall produce to the Society 

 the best substitute, superior to any hitherto 

 known, for the basis of paint, equally proper for 

 the purpose as the white lead now employed £ 

 such substitute not to be of a noxious quality, and 

 to be afforded at a price not materially higher 

 than that of white lead ; the gold medal, or one 

 hundred guineas. A quantity of the substitute, 

 not less than 50 lbv weight, with an account of 

 the process used in preparing it, and ceitificates 

 that at least one hundred weight has been manu- 

 factured, to be produced to the Society on or be- 

 fore the first Tuesday in January, 1803. 



83. Red Pigment. To the person who shall 

 discover to the Society a full and satisfactory 

 process for preparing a red pigment, fit for use, 

 in oil or water, equal in tone and brilliancy to 

 the best carmines and lakes now known or in 

 use, and perfectly durable; the gold medal, or 

 thirty guineas. One pound weight of such cc*. 

 lour, and a full disclosure of its preparation, to 

 be produced to the Society on or before the first 

 Tuesday in February, 1803. 



A r . B, It is not required that the colour should 

 resist the action of fire or chemical applications, 

 but remain unaltered by the common exposure 

 to strong light, damps, and noisome vapours. 



84. Ultramarine. To the person who 

 shall prepare an artificial ultramarine, equal in 

 colour, brilliancy, or durability, to the best pre- 

 pared from lapis lazuli, and which may be afford- 

 ed at a cheap rate; the gold medal, or thirty 

 guineas. The conditions are the same as in the 

 preceding p^miumfor the red pigment. 



85. Analysis of British Minerals. To 

 the person who shallcorumuuicate tothe Soci«ty, 



