104 
ADDENDA. 
By B. E. F. 
In the experiments recently made by Dr. Boehine, to ascertain the 
relative effect on impregnated and natural wood, samples of various 
treatment demonstrated that impregnated wood absorbed much less 
water than the natural wood. Increase in volume in consequence of 
absorption of water was less in the impregnated than in the natural 
samples. 
Tests of the bending strength of the samples showed that those im- 
pregnated were stronger by 15 per cent. Resistance to compression was 
greater by about 22 per cent, in the case of the impregnated samples. 
It would appear of interest to state here that by creosoting the 
strength of the timber is also increased. The following results confirm- 
ing this view are taken from some experiments which were submitted 
to the British Civil and Mechanical Engineers' Society some time ago. 
The sizes of the pieces tested were 2 feet G inches by 2 inches by 1J 
inches; the pressure was applied midway between supports 2 feet apart. 
Series No. 1.— Sis pieces 
of Memel fir, not cre- 
osoted, weighing 9| 
pounds. 
Series No. 2.— Sixpieces 
of Memel fir,creosoted, 
cut out of the same 
plank as preceding, 
Aveishing 13k pounds. 
Series No. 3. — Six pieces 
of Scotch fir, not cre- 
osoted, weighing 9 
pounds. 
Series No. 4.— Sixpieces 
of Scotch fir, creosoted, 
cut out of the same 
sleeper as the preced- 
ing, weighing 1G| 
pounds. 
Cwt. 
No. 1 broke with ]2£ 
2 10* 
3 10i 
4 11£ 
5 11 
6 10 
Cwt. 
No. 1 broke with 12 
2 32 
3 11 
4 11 
5 11J 
6 12J 
Cwt. 
No. 1 broke with 15 
2 14 
3 12i 
4 13 
5 13| 
G 14 
Cwt. 
No. 1 broke with 16 
2 14 
3 14i 
4 17* 
5 14 
6 1G 
Averag 
e.... 11 
Average 11 f 
Average 
... 13§ 
Average 15£ 
Summary of Average Results. 
Cwt. 
Memel fir not creosoted 11 
Memel fir creosoted llf 
Scotch fir not creosoted 13| 
Scotch fir creosoted 15| 
CARBOLINETJM AS A PROTECTION AGAINST THE DECAY OF WOOD. 
According to F. Engel, Government surveyor of buildings, painting 
wood with carbolineum as a protection against the weather and rot 
gives favorable results. The Imperial Government surveyor of build- 
ings also confirms this statement in a certificate under date of January 
19, 1885, in which he states that on the imperial roads wood- work used 
in underground construction during the years from 1870 to 1885, when 
painted with carbolineum, had no decay up to date of certificate. 
For the sake of experiment, two pieces of pine wood, taken from the 
same plank, were thus treated : The first was painted with carbolineum. 
