NOTES AND QUERIES. 



173 



Figures for trees measured up to igth April 191 7. 



Trees measured 

 Average height 

 Form-factor for all trees . 

 Extreme form-factors 



The following was the 

 figures : — 



Each pole was measured for full length . to arrive at contents of 

 Each pole was girthed at 4 ft. 3 ins. > true cylinder by square 



from butt end / of j-girth calculation. 



Each pole was measured to end of \ to find contents of tree 



timber ^by square of j-girth 



Each pole was girthed at half-way 



) 



calculation. 



The contents of each tree, in inches, were divided by the 

 contents of a true cylinder based on the ^-girth at 4 ft. 3 ins. of 



each tree. 



Example. 



Tree 50 ft. in height x 8J ins. i-girth at 4 ft. 3 ins. 



Contents of cylinder = 25 ft. 



Contents of tree to timber-height 40 ft. x 6^ ins. :i-girth = 1 1 ft. 8 ins. 



25 ft. = 300 ins. II ft. 8 ins. = 140 ins. 



140 ^A 



— !— = ■400, or say "47. 



300 ^ ' 



All form-factors for each species were added together and 

 divided by the total number of poles of that species. 



The reason for the reduced form-factors in the second list is, 

 that the additional trees were measured where the height-growth 

 was slightly better, but the trees being more drawn up, the top 

 of the "timber" was brought proportionately lower, or, in other 

 words, a longer length of top was cut oflf. 



W. H. Whellens. 



