COLLECTION OF DATA FOR GROWTH STUDIES 



13 



C. Measurements Required .—The measurements will correspond to those 

 outlined for Problem 6, except that the D.I.B. at the top end of each 

 section will be taken instead of the D.O.B. The following additional 

 measurements will also be necessary: 



D. Method of Procedure. 



1. The Poleman. 



The Poleman, with the added duties of caliperman, will follow the 

 same routine as before (see Problem 6), except that both series of 

 measurements will be made at the same time as he proceeds along 

 the tree. 



2. The Ring Counter. 



(a) 



(c) 



id) 



The Ring Counter first obtains the average width of the bark. 



Then with the D.I.B. as obtained by the poleman he computes 

 the average radius, and with the centering pin at the pith of the 

 tree he swings the analysis rule until the length of the average 

 radius just cuts the outer edge of the last ring. 



A straight line is now drawn from the pith to the bark along this 

 radius. The rings are then counted from the bark to the pith 

 and the tenth ring of each decade marked with a soft pencil. 

 Care should be used to place the mark within the tenth ring. 



The total age at the cut and the distances from the pith to each 

 tenth ring are then read off to the note-keeper m inches to the 

 nearest 0.05. In reading off the decade measurements care 

 should be taken to read to the inner edge of the early wood of 

 each of the marked rings. 



3. The Tallyman. 



(a) The Tallyman records the measurements in the proper column on 

 the Tree Analysis Blank (Form 2A and B.) In recording the 

 first decade measurement it will be found that it usually does 

 not represent a full period of ten years. The number of rings 

 included in this measurement should therefore be indicated in 

 the upper left-hand corner of the space allotted to this measure- 

 ment on the back side of the sheet (Form 2B.), and divided off 

 from this space by a diagonal line. 



(6) He should make the following checks on the analysis sheet. 



