578 
‘who shall invent and discover to the Society 
a method, verified by actual experiments, of 
increasing the quantity or force of steam, in 
gteam-envines, with less fuel than has hitherto 
been employed, provided that in general the 
whole amount of the expenses m using steam- 
engines may be considerably lessened; the 
gold medal, or thirty guiness. To be com- 
municated to the Society on or before the first 
Tuesday in January, 1805. 
‘97, SusstiruTEFoR Tar. Tothe person 
who shall invent and discover to the Society 
the best substitute for 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 himdred gui- 
neas. A quantity of the substitute, not less 
than one hundred weight, with certificates 
that at least one ton has been manufactured, 
‘and that it can be afforded at a price not ex- 
teeding 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, 1805. 
98. Preparation Or Tan. . To the per- 
son who shall prepare in the most coucen- 
trated form, so as to be easily portable, and 
at a price applicable to the purposes of manu- 
factures, the largest quantity, not less than one 
hundred weight, of the principle called by the 
French tanuin, which abounds in oak-bark 
and many other vegetable substances ; the gold 
medal, or fifty gumeas. Certificates of the 
_superior quality of the quantity so prepared, and 
a sample of not less than 28lb. to be produced 
to the Society on or before the last Tuesday in 
January, 1805. 
99. Inpritste Ink. To the person who 
shall discover to the Society, a method of 
waking a black ink proper for writing, supe- 
rior to any at present known, indestructible by 
che'nica! applications, and not dearer than 
that which is now m common use ; the silver 
medal or fifteen guineas. Certificates that not 
less than two gallons of such ink have been 
actually prepared. and found to possess the 
qualifies above mentioned, with a full detail of 
the. precess of making it, and two quarts of the 
ink, tobe delivered to the Society on or before 
the second Tuesday in January, 1805. 
100. PREPARATION OF A RED STAIN FOR 
Corron Crorn. To the person who shall 
communicate to the Society, the cheapest and 
most effectual method of printing or staming 
cotton cloths with a red colour, by an imme- 
diate application of the colouring-matter to the 
cloth, equally beautiful and durable wit: the 
red colours now generally procured from de- 
_coctions of madder ; the gold medal, or thirty 
‘guineas. Certificates that the above process 
So been advantageously used on ten pieces of 
calico, eath twenty-one yards or upwards in- 
teaoth, one piece of the calico so printed, a 
Premiums it Chemistry, §c. 
{June, 
quart of the colour in a liquid state, and a 
full account of the preparation and applica- 
tion, tobe producéd to the Seciety on or be- 
fore the second Tuesday in January, 1805. 
101. Preparation of aA GREEN CoLovR 
FOR PRINTING Cotton Crorn. To the per- 
son who shall communicate to the Society the 
best and cheapest method of printing with a 
full green colour on cotton cloth, by an im- 
mediate application of the colouring matter 
from a wooden block to the cloth, equally 
beautiful and durable asthe colours now formed 
from the complicated process of the decoction 
of weld on alumime and the solutions of in- 
digo by earths or alkaline salts ; the gold medal, 
or thirty guimeas. . Certificates and conditions 
as for premium 100. 
_ 102. Suxnsrirure ror THE Basis or 
Parnt. 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 noxi- 
ous quality, and to be afforded at a price not 
materially higher than that of white lead ; the 
gold medal, or one hundred guineas. A quan- 
tity of the substitute, not less than 501b. weight, 
with an account of the process used in preparing 
it, and certijicates that at least one hundred 
weight has been manufactured, to be produced 
to the Society on or before the first Tuesday in 
January, 1805. 
103. Rep Picmenr. To the person who 
shall discover to the Society a full and satis- 
factory process for preparing a red pigment, fit 
for use, in oil and water, equal in tone and 
brilliancy to the best ¢armines and lakes now ' 
known or in use; and perfectly durable; the 
gold medal, or thirty guineas. One pound 
weight of such oolour, and a full disclosure of 
its preparation, to be produced te the Society 
on or before the first Tuesday in Feb. 1805. 
N.B. It is not required that the colour 
should resist the action of fire or chemical ap- 
plications, but remain unaltered by the com- 
mon exposure to strong light, damps, and noi- 
some vapours. 
104, Utrramarine. To the person who 
shall prepare an artificial ultramarine, equal ia 
colour, brilliancy, or durability, to the best 
prepared from lapis lazuli, and which may be 
afforded at a cheap rate; the gold medal, or 
thirty guineas. The conditions are the same as 
in the precediag premium for the red pigment.” 
105. Awnatrysis or Britisn Minerats. 
To the person who shall communicate to the 
Society, the most correct analysis of any mi- 
neral production of Great-Britain, hitherto ei- 
ther unexamined, or not examined with accu- 
racy; the gold medal. The analysis and suf- 
ficient specimens to be produced to the Society. 
on or before the first Tuesday in Jan. 1805. 
206. Statuary Marere. To the person - 
