2 Forestry Quarterly 



as to size and shape of estimate sheets and volume tables, both of 

 which must be of such size as to fit snugly in their respective com- 

 partments. The sheets and volume tables are held flat in the case 

 by narrow, thin metal pieces attached to and projecting about an 

 eighth of an inch over the side and center wooden strips. A thin, 

 beveled straight-edge C, which slides on the edges of the case 

 parallel to the lines on the sheets and volume tables, is essential 

 for preventing mistakes in reading volume figures. 



Multiple volume tables are used in order to obviate the neces- 

 sity of making multiplications in instances where several trees 

 of one diameter-log-length class have been tallied on the same 

 sheet. Each log-length class in the volume table has a distinc- 

 tive color. Through this means it is possible to locate a desired 

 column in the table at a glance, and the chances of making 

 mistakes through reading from a wrong column are practically 

 eliminated. 



The computations are made by two men. One reads the total 

 volume of the trees in each diameter-log-length space from the 

 volume table and the other records these figures on the adding 

 machine. When all the volumes of one species on the sheet have 

 been called, the total is written in the space provided for it at the 

 head of the species column. The volume tables are provided with 

 an indented marginal index which facilitates changing them when 

 several species are being worked up on the same sheet. 



In cases where large tracts of timber are being estimated, it 

 would prove an excellent plan to compute the estimates in the 

 field in this same way. A small adding machine which may be 

 easily transported could be used in most instances to good advan- 

 tage. Everyone who has had experience in timber estimating 

 will appreciate the advantages of completing the estimate calcu- 

 lations at the time field work is in progress, rather than at a later 

 date in the office. 



