Continuation on a Second Sheet 



If enough measurements are made on a single tree to require continuation on a 

 second sheet, fill the spaces at the top of the second sheet so as to duplicate the 

 first card. Write "continued" at the top of the second sheet (and the third, if neces- 

 sary). On the first sheet write "1 of 2" or "1 of 3" in the upper right-hand corner. 

 On the second (or third) write "2 of 2" or "3 of 3," etc., in the upper right-hand 

 corner (fig . 9) . 



Forked Trees 



Figure 9 shows how data for forked trees are recorded. After the stump and d.b.h. 

 measurements are recorded, instrument readings are recorded up to the last measurement 

 below the fork, corresponding to measurement 4. The readings taken at such a point 

 were recorded on the fourth row of the first sheet. The sine elevation reading at this 

 level is -1000, and a plus sign (+) is recorded in the extra box on the right edge of 

 column G. This keys the computer program to compute the volume of the next section of 

 tree trunk separately and to add it to the volume that has already been accumulated. 



Measurements for the first fork follow, starting on the fifth row. Note that the 

 sine elevation recorded for the bottom of the fork is about the same as that recorded 

 for the top of the first trunk section. Measurements are then taken up the stem of the 

 fork and recorded as shown. At the top of the first fork, TGRADS and FGRADS readings 

 are equal (line 11 of card 1). No dendrometer readings are recordedon the twelfth 

 line . 



The measurements for the second fork are punched into a different set of data 

 cards. In the deck of punched cards for a tree, it is essential that measurements for 

 the portion of the trunk below a fork and for the forked portions not be punched into 

 the same card. For this reason the twelfth line on the first card is left blank except 

 for the slash (/) in the extra box at the right of column G. On the first line of the 

 lower portion of the sheet for this tree (which will be the first set of measurements 

 on the fourth punched card) , are entered the dendrometer readings for the bottom of the 

 second fork. Dendrometer readings are then recorded for successive levels of measure- 

 ment up the stem of the fork until the top is reached. The first box at the right of 

 column G following the last entry of data (which happens to be on the same line on this 

 card) then contains an asterisk (*) to signify the end of data for that tree. 



Change in Instrument Location 



The dendrometer may be moved from one observation level to another without special 

 recording procedures only if the new location is on the same horizontal plane as the 

 previous location. 



One move to a different horizontal plane is permitted. The way in which data are 

 recorded after change to a new elevation is shown in figure 10. Measurements are taken 

 and recorded in the usual fashion until it is desirable to move the instrument to a new 

 location. Readings taken at this new level are recorded on line 6 of the sample form 

 (fig. 10). 



Data for forked trees require special precaution when the instrument is moved 

 because the plus character is used to indicate both (1) the point at which a fork 

 leaves the bole and (2) the relocation of the instrument. To overcome this ambiguity, 

 the convention has been adopted that only the first plus recorded for a forked tree can 

 represent a relocation. All subsequent plus characters are interpreted as fork loca- 

 tions. A + sign is then placed as shown on line 8. After the instrument is set up at 

 the new location, a measurement is taken at the same height on the tree as the last 



25 



