Part VI] Pearson: Note on Shorea robusta (Sal) Timber. 17 
The conclusions arrived at from the shearing tests, carried out 'parallel 
to the grain , are as follows :— 
(1) There is no difference in the strength of timber seasoned in the 
open or under shade, nor is there any marked difference in 
timber seasoned on land or after immersion in water. 
(2) Trees were felled in September, December and June, and shearing 
tests carried out on timber of each class. As was the case 
with tests for transverse and compression strains, the Decem¬ 
ber felled timber was strongest, amounting to 0-97 tons 
per square inch. That cut in June was nearly as strong 
amounting to 0-96 tons per square inch, and that from Septem¬ 
ber cut logs 0-84 tons per square inch. The differences in 
strength of timbers cut at different seasons of the year are 
not so marked in the case of shearing tests as in those for 
transverse strain and compression, as the interlocked nature 
of the fibre is the main factor in determining its strength 
to withstand shearing. 
(3) There is practically no difference in the strength of the timber 
grown in the plains or hills to withstand shearing, either 
in the case of Central Provinces or United Provinces Sal. 
(4) From the results recorded above the strength of Sal to with¬ 
stand shearing may be taken as 0-90 tons per square inch. 
u 
[ 136 ] 
