278 
TIMBER 
diversity of opinion as to its advantages, and it is much 
more suitable in some situations than in others.^ 
Boucherie's Process, which appears to be the same as 
Marjery's, consists of the injection of sulphate of copper in 
the proportion of 1 lb. of copper to 8 or 12 gallons of 
water, and was at one time used with fair success in 
England for telegraph poles and is now used in France 
and Germany ; in the latter country ]30sts have a life of 
over thirteen years. According to a recent statement in 
L' Electrician , Paris, vol. 32 (1906), it is necessary that the 
wood should be treated not later than eight or ten days 
after the tree is cut down, and another disadvantage is that 
the life of the posts is affected by the nature of the soil in 
which they are placed. 
Kyanizing is the impregnation of timber with bichloride 
of mercury in the proportion of 1 lb. of the bichloride to 
5 gallons (about 50 lbs.) of water ; it is sometimes simply 
allowed to soak into the wood steeped in the vat, but as a 
rule it is pressed in the same way as in the case of bur- 
nettizing and creosoting, and in the same tanks which are 
used for creosoting. 
Kyanizing is much used by the North Eastern Eailway 
Company in Newcastle-on-Tyne and district for the treat- 
ment of wood for coaling staiths, planking of bridges, etc., 
and for the latter it has proved very satisfactory. The 
author has a specimen of kyanized plank cut from a bridge 
deck after being in an exposed situation for forty-one 
years, which is perfectly hard and sound. The process is 
said to be a preservative against fire, but that is very 
doubtful, and in water, particularly sea water, it appears 
' Latest practice aims at getting not less than half a pound of pux'e 
zinc chloride into each cubic foot of timber. 
