Page 655 radio acoustic ranging 6854 



back of the tape near the initial end, and the data should be entered before the tape 

 is folded. 



After the tapes have been verified they are folded to a uniform size. A Wright 

 bobbin, similar to the instruments used by net makers to obtain a imiform mesh, may 

 be made from a thin piece of hardwood or plastic material on which the tapes may 



No. 41 Position No. . . . f?i^. Day A^ 



Sheet No. . PS' .?.<? f^. /.... Date : . .^ .- 6 - 4 1 



Figure 142.— Facsimile of stamp used on chronograpii tapes. 



be uniformly folded. The Wright bobbin should be about 5 inches long and the end 

 edges should be beveled slightly so that the folded tape may be removed without 

 difficulty. The tape should be folded with the initial end on the outside so that the 

 identifying data will be exposed to view. 



The folded chronograph tapes should be filed in numerical order in a box or a drawer 

 at the chronograph station and, at the end of survey operations each day, they should 

 be tied in a package, marked so that it may be identified. Strips of stiff cardboard, 

 of the same size as the folded tapes, should be placed on the top and bottom of the 

 package and the whole held together by rubber bands near each end. The two card- 

 board strips may be stamped with rubber Stamp No. 41 and the identifying data 

 entered. 



The packages of chronograph tapes should be stored in the field records locker 

 and be preserved with the same care as any original records. 



The tapes must be preserved for the use of the smooth-sheet plotter and accom- 

 pany the other survey records until the smooth sheet has been plotted and is ready 

 to be sent to the Washington Office, when they may be destroyed. 



