326 
PRACTICAL PAPER MAKING. 
(Concluded from page 224.) 
M CANSON’S METHOD OF SIZING IN THE PULP.— 
« This process is no longer a secret, but is in the 
hands of a great number of persons; nevertheless, as the 
inventor has taken out a patent which insures hima mono- 
poly, we think it right to notify to the reader that the follow- 
ing description of the process does not give him the least 
right to avail himself of it in practice, until the patent has 
expired, without the formal and written consent of M. 
Canson. ; 
The inventor operates in this wise :—_A wax soap is pre- 
pared, of which the following are the proportions: To one 
litre (1°76 pts.) of a solution of caustic soda, marking five 
degrees on Beaumé’s hydrometer, is added o'5 kilog. (1°10 
lbs. avoird.) of white wax. and the mixture boiled till the 
wax is completely dissolved. The liquid soap is then 
poured into 30 or 40 litres (6°60 to 8°80 galls.) of boiling 
water, and 3 kilog. (6°60 lbs.) of potato starch well mixed 
- with water are at once added. The mixture is stirred till it 
thickens and forms a paste, which, if kept in a cool place, 
even in summer may be preserved for a fortnight without 
spoiling. 
_ In using this size it is poured into the rag-engine, con- 
taining 30 kilog. (66°14 lbs.) of dry rag pulp mixed with the 
quantity of water required by the quality of paper to be 
made, and the composition is allowed to become well incor- 
porated in the pulp. There are then added 300, 400, or 500, 
grammes (0.66, 0.88, or 1.10 lbs.) of powdered alum dis- 
solved in boiling water. After the cylinder has been 
worked long enough to penetrate the pulp thoroughly with _ 
these ingredients, the ordinary operation of manufacture is 
continued. 
The inventor only makes use of this process for fine 
papers, and especially those destined for writing purposes, 
for common papers he suppresses the wax soap, and only 
uses white soap and starch, though he still impregnates the 
pulp with these substances in the rag-engine. . 
In the beginning of the year 1827, M. Canson submitted 
paper of his manufacture to the “ Societé d Encouragement,” 
which referred the examination to its commission. M. 
Merimée made his report on this subject at the meeting of 
the rith of April, in which it was set forth that sizing in 
