Cost of Logging Large and Small Timber 



451 



to saw M board feet progressively increases as the logs become 

 shorter or on account of the fact that more logs must be handled 

 to secure a M feet, and the difference in sawing time is the addi- 

 tional time required for handling the extra logs and the extra time 

 lost by the log carriage in returning. 



In order to employ the results which are given for the different 

 steps in operating in actuary calculation, it is necessary to convert 

 them to the unit base of costs of the particular operation. This 

 unit base will vary (a) according as to whether the conduct of the 

 operation is more or less efficient than those at which the data 

 submitted were obtained; (b) proportionately to the logging diffi- 

 culties of the site ; and (c) for sawing as the capacity of the mill. 

 These variations affecting costs apply particularly to sawing at 



MINUTES r/fOi/JAHOJ 



a 10 



30 32 



12 It 16 /e 20 22 2^ 26 28 

 D/AMETER OF LOG /N INCHES 



F/GUff£ ^ TIME /N MINUTE3 ftEQUIREO rO S/^Hi' I.OGS Of O/ffE/iENT LENGTH^ 

 AND D/AMETERS AND RELATII/E O/I/Lr CAfiAC/Ty OF BAA/O At/U. 

 SAkVlMG JC/C/y /.OGS. <5C?/=7- yfOOOtS. 



the mill and to skidding and hauling. There is less opportunity 

 for variation influencing cost of felling, its controlling factor in 

 variation in timber of the same hardness and log length being the 

 efficiency of the individual felling crew and there being more 

 variation in the capacity of individual crews on specific operations 

 than between the average felling work of different operations. For 

 a specific operation, data for such a comparison can be secured in 

 several ways, but the most accurate method is to test, for the 

 operation being investigated, the different phases which are under 

 consideration and to determine by means of a comparatively small 

 voliime of data so taken their relation to the standards which are 

 here submitted. For skidding it will be necessary to obtain the 

 average skidding time and the total board feet contents of a niimber 



