FIELDS H-l and H-2 



Columns 29, 30, 31, 



32, 33, and 34 



10. Symbols available for additional items of Field H 



In Column 30 (Field H-l), the IBM 12 zone punch (Symbol *) has been given a special meaning 

 (see Division 6 above). Therefore, none of letters A through I may be used for the second unit 

 (Column 30) of anatomy structures. If a special list were made for Field H-2, letters A through I might 

 be used in Column 33, but the CBCC has found the nine numbers and 17 letters (J through Z) adequate 

 for the second unit of the symbols and a special list for Field H-2 unnecessary. For additional systems 

 of animals, Symbol 4 (Column 29) is available; for additional plant organ systems, Symbol R (Column 

 29) is available. Symbols T through Z are also available, if needed for animal or plant organ systems. 



1 1. File of coded biology data on IBM punched cards arranged according to symbols for gross 

 anatomical structures 



The CBCC maintains a special IBM punched card file of all coded information in which a primary 

 organ has been involved and for which Field H-l has subsequently been coded. The file is arranged by 

 Field H symbols so that all coded information on any given structure can be retrieved by simple manual 

 removal from this file (e. g. , all coded information on the nervous system, in toto, or on the cerebellum, 

 the heart, or the carotid sinus, etc. ). 



No such file has been established for secondary organs (Field H-2). 



12. Double coding in Field H 



Double coding is not permitted in Field H-l or H-2. When Column 30 of Field H-l is coded 

 with Symbol * plus any one of Symbols 1 through 9 and J through Z (representing essentially the coding 

 of two information categories), two IBM cards are punched. On the first, both symbols of Column 30 

 are punched; the second card is punched to be identical to the first except that the punch in the 12 

 position is omitted from Column 3 0. In the IBM Punched Card File arranged according to entries in 

 Field H-l, the second card is filed according to the symbol for the organ, but the first card is filed 

 separately at the end of the file; in all the other IBM Punched Card Files, the two cards are filed 

 together. So few instances of the use of Symbol * occur in Column 3 0, the number of duplicate cards 

 for such code lines is negligible. 



- 65 



