68 INSTRUCTIONS FOR MAKING FOREST SURVEYS, ETC. 



inch to 1 mile, 1 and upon a uniform legend. They are 

 not always sufficiently accurate for forest work, and 

 the sheets must, therefore, be corrected whenever new 

 data have been obtainsd in the field. The manner of 

 correcting sheets is shown on the ' 'dummy Atlas sheet," 

 which has been issued to forest officers. The method 

 is that used by printers in correcting proof. Bold lines 

 should be drawn to the margin of the sheet and explan- 

 atory notes written clearly. Do not make neat cor- 

 rections without the marginal note, or it will not be 

 apparent that the sheet has been corrected. Do not 

 write letters or memoranda telling how a sheet should 

 be corrected. Do it yourself. Do not be afraid to mark 

 up any sheet because it is beautifully engraved or col- 

 ored. Your corrections will make it more valuable. 



New data obtained by reconnaissance is usually 

 mapped on a scale of 2 inches or 4 inches to 1 mile. 

 Such data should not be redrawn to the standard Atlas 

 scale in the field. The reconnaissance tracings should 

 be sent to Washington with a requisition, Form 988, 

 for photoreduction. For this and other reasons recon- 

 naissance tracings and other base maps should be 

 drawn with black ink only, and should show only the 

 drainage, contour, culture, and land lines. Other data, 

 such as classification, forest or grazing types, or admin- 

 istration districts, can be shown by appropriate colors 

 upon two or more prints. By this method the tracing 

 remains a record which is subject to very little change, 



1 The mother maps of Great Britain and India are on the same scale as the Forest 

 Atlas standard. Those of France, Spain, Italy, Switzerland, and Sweden are nearly 

 the same, 1J inches to the mile. Those of Bosnia, Herzegovina, Norway, Bulgaria, 

 Hungary, Russia, and Portugal are on smaller scales; those of Germany, Belgium, 

 Denmark, and the Netherlands are on larger scales. 



