APPENDIX I. 429 



APPENDIX I. 



(Referring to Table CLXX., Appendix F.) 



"Well-squared timber," as understood in the trade, is 

 nearly die square, and admits of little wane on the angles 

 at any part of the log. The yield of this is about '68 per 

 cubic foot of raw material, as shown in Appendix F against 

 Tewart. Some woods, when exceedingly well squared, will 

 often yield a little more; as Mexican Mahogany. Others 

 again, which are imperfectly manufactured, yield considerably 

 less per cubic foot ; as African. 



The figures against Oak, English, were obtained from the 

 conversion of both " rough " and " sided," not square timber. 

 Also the figures against Elm, English, were obtained from 

 " rough," and not square timber. 



The results given in the table were obtained from the 

 conversion of timber for ship-building at Woolwich Dockyard. 

 For civil architecture and engineering purposes the yield per 

 cubic foot would probably be better, as there would be less 

 waste in cutting to straight than to curved lines. 



The advantage of the table will be manifest on trial, since, 

 if the figures in column A, which stand against any one of the 

 woods mentioned in the list, are used as divisors of the net 

 quantity of converted timber material required for any purpose, 

 the quantity of hewn or square timber, i.e., raw material, 

 which it is necessary to purchase to produce it, is readily 

 found. 



Example : — If 5,600 cubic feet of converted timber 

 material (Dantzic Fir) are required, how much hewn or square 

 timber will it be necessary to purchase to produce it ? 



