TIMBER FOR AEROPLANE AND PIT-PROP PURPOSES. 



109 



District grown : (7) Munches. 

 Date of felling, November 1919. Material tested, February 1921. 



District grown : (8) Ardgowan, Inverkip. 



3 -So 



Specimen badly bent: failed at bend 12 ins. from top 



by shear, and split above shear. 

 Specimen badly bent : cracked across at bend near 



centre, and split upwards. 



Douglas Fir. District grown : (2) Fyvie (Plot 377). 

 Date of felling, December 1919. Material tested, February 1921. 



40-0 



4484 



Cracked across line of knots at centre. 



District grown : (3) Munches. 

 Date of felling, November 1919. Material tested, February 1921. 



Specimen originally bent : failed at centre by shear. 

 Cracked across line of knots 15 ins. from top. 

 Failed by crushing at ring of knots near the top. 

 Cracked above ring of knots, 14 ins. from bottom. 



8-41 



Sitka Spruce District grown : Drumlanrig. 

 Date of felling, August 1919. 



(a) Morton Mains. 

 39 'O j 2460 ; Cracked across ring of knots 15 ins. from bottom, and 

 I I split downwards to bottom. 



{b) Whellens. 



Cracked across 13 ins. from bottom and split down- 

 wards to bottom : small cracks above shear. 



Specimen originally split at top : sheared across 18 ins. 

 from bottom and split downwards to bottom. 



{c) Column Wood. 

 Cracked across 8 ins. from top and split upwards ; 



good straight specimen. 

 Split upwards and sheared at an angle of 45°, 9 ins. 



from top. 



