248 
TIMBER 
the weight of this sample was 70 lbs. per cubic foot ; a 
sample paving block weighed 64^ lbs. per cubic foot. Under 
a compressive test a piece 10 ft. long and 8-98 inches X 8-90 
inches = 79'92 square inches crushed under a total load of 
380,100 lbs. = 4,756 lbs. per square inch ; the weight of 
i'hoto hi/] i_ Oiihridge. 
Fig. 35.— Crusliing Tests of Tasmaniaii Blue Gum. 
this sample was 71^ lbs. per cubic foot. Fig. 35 shows the 
peculiar twisting of the fibres of blue gum under com- 
pressive stress. These samples stood about 2J tons per 
square inch. One sample is particularly noticeable where 
the timber has opened so clean and sharp as to look like a 
mortice. A piece of blue gum scantling 146 ft. long and 
