throu^ a microfilm reader or a 35-i'™« projector. Individual frames 

 may "be cut from the film strip and inserted into electronic accounting 

 machine (E.A.M.) punch cards for filing. Station number, Greenwich 

 mean time, and sonic information are punched onto the E.A.M. card. 

 However, none of the pertinent log sheet information was included. 



The same year, the Wavy Electronics Laboratory developed a similar 

 type of light, portable copy camera (Schaniel, 1953)- This camera 

 utilizes a Polaroid Lend-back camera. This further reduces the time 

 required to obtain finished prints but does not produce negatives 

 suitable for reproduction or filing. Although this camera is useful 

 at sea for rapid photographing of prints, no provision is made for 

 transcribing the log sheet data. 



Since early In 195^ a new method has been in use at Woods Hole 

 Oceanographic Institution, which utilizes an ammonia vapor (ozalld) 

 processing method of producing multiple prints (Schroeder, 1955)' 

 This excellent method provides a type of negative to reproduce the 

 data on both sides of the prints, thus considerably reducing the 

 time previously required to prepare prints and hand -copy data onto 

 the back of each. It is necessary to copy the data only once for 

 each slide. 



In 1955 "the Hydrographic Office together with the Naval Research 

 Laboratory developed a method for photographing the BT slide, grid, 

 and the pertinent line of log sheet data in a single operation. This 

 recorder-camera was designed and built by N. R. L. It is described 

 in section B.(3). below. 



B. PROCESSING BATHYTHERMOGSAffi DATA AT THE HYDROGRAPHIC OFFICE 



1. Receiving and Logging Bathythermograph Observations 



As is indicated by the flow chart (fig. 1), the greatest 

 portion of bathythermograph slides and log sheets are received from 

 the following sources : 



a. U. S. Navy ships 



b. Hydrographic and Oceanographic Survey ships 



c. Weather ships 



d. Other U. S. and foreign government agencies and private 

 institutions 



After the log sheets and slides are received at the Hydrographic 

 Office they are logged in and assigned a priority number and a con- 

 secutive file, or cruise number. The log sheets are filed in manlla 

 folders upon -which a form has been printed that is used to record 

 evaluation of condition of the slides and log sheets and the progress 

 of the processing. A ship record is maintained in a Kardex file with 

 one card for each observing ship. On each card Is recorded the following 

 Information: 



