TIMBER FOR AEROPLANE AND PIT-PROP PURPOSES. 



lOI 



Norway Spruce. District grown : (3) Finzean, Banchory. 

 Material received, February 1920. Material tested, March 1920. 



European Larch. District grown : (4) Finzean, Banchory. 

 Material received, February 1920. Material tested, March 1920. 



Split before test : split at small end. 



Gave way 4 ins. from big end : crushed and 



split at big end. This was a very straight 



prop, of uniform cross-section. 

 Bent before test i^ ins. at centre : sheared at 



small end. 

 Sheared iS ins. from big end : split to big end. 

 Sheared 12 ins. from small end. 

 Initially split : sheared at top and split. 

 Bent at centre : split to big end. 

 Bent before test : bent 12 ins. from big end: 



split to big end. 

 Split before test : bent at centre : cracked on 



tension side. 

 Bent at centre : split from centre to both ends. 



Thuya gigantea. District grown : (2) Murthly. 

 Material received, December 1918. Material tested, January 1920. 



Bent and cracked 14 ins. from small end : 



very dry. 

 Broke in two, 15 ins. from small end : very 



dry. 



VOL. XXXVIII. PART II. 



