Indian, Forest Records. 
[VOL. III. 
12 
to a lesser degree ; on the other hand, the conditions under which 
the timber is placed in the ground or in damp hot mining galleries 
are not so favourable as those in the case of a sleeper lying in clean 
ballast. The result of such variations in the climatic and atmospheric 
conditions will necessitate the use of stronger solution and entail deeper 
impregnation in the case of mining-props and the butt-ends of posts to 
be placed in the ground, than in the case of sleepers or such timber as is 
not liable to excessive and continued damp. 
SuMMAltY. 
The results which may be obtained by treating timber according to 
the Open Tank method are likely to vary considerably according to the 
climatic influences to which the treated timber is exposed. The advan¬ 
tages of pneumatic injection, by which a timber is impregnated 
throughout are obvious, especially when the treated timber is placed in 
localities of heavy rainfall such as occurs in many parts of India. By 
immersion it is not always possible to obtain complete saturation, besides 
which to do so is often expensive and it remains to be seen if partial 
impregnation will answer our purpose, especially under the many adverse 
conditions in which such sleeper timber must naturally be placed, while 
the result must largely depend on the power of the antiseptic employed 
to withstand being washed out of the timber or evaporated by excessive 
beat. 
(*) CHLORIDE OF MERCURY OR THE “KYANtZING” PROCESS. 
Couuosive Sublimate. 
One of the earliest methods of treating timber was to subject it to a 
bath of chloride of mercury (corrosive sublimate) and without doubt 
the process Was most beneficial, for Kyamzing timber, as the process is 
named after the inventor, is still employed by the State Telegraph 
Companies in Germany. The system would be more universally in 
favour at the present day, were it not for the fact that the salt is highly 
poisonous anti at the same time expensive. 
( 116 ) 
