76 Forest Club Annual 



or five percent of the entire forty. It is evident that if the 

 strip is a fair representative of the forty that the estimate 

 should be multiplied by twenty to get the total stand for that 

 area. This is the method which several of the forests followed, 

 even when the strip was a poor representative, but only when 

 much larger areas than forties were considered as units. This 

 was done on the assumption that the errors incurred were 

 compensating for a large territory, that is, that where one 

 strip would be an under-estimate for a forty, another would 

 be an over-estimate and thus in the long run an approximate 

 volume would be obtained. Other forests using the strip 

 method attempted to get a correct volume for each separate 

 forty by multiplying the two-acre estimate by a figure greater 

 or less than twenty according to whether the two acres esti- 

 mated contained poorer or better timber than the average for 

 the entire forty. To determine this correction factor for a 

 forty, the cruiser must be experienced and must show good 

 judgment. He must observe carefully the timber on both 

 sides of the strip and determine the relative condition of the 

 timber on the estimated strip with that on the rest of the 

 forty. Poor judgment in the use of the correction factor, 

 making it too large or too small, will cause a large error in 

 the computed stand for the forty. 



To get a ten percent estimate by the strip method, two 

 lines were run through a forty and in 'one case one strip two 

 chains wide was used. For the two and one-half percent 

 work the strips were run between forties, thus making two 

 strips through each section. Then by applying a separate 

 correction factor for the forty on either side of the strip the 

 volumes of the respective forties were obtained. This method 

 of running between forties was used chiefly in case of large 

 burns, parks, grass land, brush areas, barren land, etc. 



In using the strip method it was customary to have two 

 men in each field party. Often, however, three men were 

 used, especially if some of them were new at the work, while 

 on one forest, parties were composed >of four men. The duties 

 of the individuals were in the main the same on the different 

 forests. Where the usual two-man party was used, one did 

 the topographic work and the other the silvicultural. The 

 first, or compassman, directed the course, with a Jacob staff 



