68 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



Pit Props : Compression/ Tests. 



Scots Pine. District grown : (i) Bowmont Forest. 

 Material received, November 191 8. Material tested, December 19 18. 



4-6 



4 '5 

 3'S 



5 "37 



675 

 3-85 

 3-98 

 2-85 



275 



District grown : (2) Gallybank, Glendye. 

 Material received, 14th June 1919. Material tested, November 1919. 



Bent 18 ins. from small end : slight cracks. , 

 Bent about 18 ins. from small end: slight cracks. 

 Bent 14 ins. from small end : cracked at small 



end. 

 Sheared 14 ins. from big end. 



Norway Spruce. District grown : (i) Bowmont Forest. 

 Material received, November 1918. Material tested, December 1918. 



Tested November 1919. Bent 18 ins. from 



small end. Split from here to big end. 

 Do. Crushed and split 9 ins. from small end. 

 Cracked about centre, tension side. 

 Split about the centre and also at one end. 

 Broke across at centre. 

 Cracked 13 ins. from big end. 



District grown : (2) Monymusk. 

 Material received, 1st November 1919. Material tested, 13th December 1919. 



Green : crushed at small end. 



Cracked at small end before test, not so green 



as 4215 : gave wa\ where lateral branches 



had come out. 

 Sheared at small end at 43'. 

 Sheared at small end at a very small angle. 



