6 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION 



III. LEAKAGE 



A fundamental defect of the area calculations is that they only 

 provide approximately correct doses for a rather small range of sizes 

 and of degrees of leakage. Every one will appreciate that since a 



Fig. 3. The size of a rent, more than a foot long in an average 

 tree, that requires a 15% increase in dose, the same would be 

 given for the larger tent shown in outline. One degree (.05%) 

 on the leakage meter is equivalent to a rent of this size. 



comparatively tight tent will require doses on a volume basis and 

 tents with average size and leakage on an area basis that other degrees 

 of leakage will not be properly provided for by either of the systems. 

 If a tent is tighter than the average it is not correct to simply reduce 

 all doses proportionately, as given on the ordinary table, since such 

 & process preserves the same system. For instance, if a five and a 



