Figure E-10. The scale divisions and the mercury 

 column of the reversing thermometer main stem as 

 seen through the thermometer viewer. Note: The 

 meniscus of the mercury column is arched. For 

 proper reading, center the top of the mercury in the 

 viewer, and read the top of the meniscus on the 

 scale ; e.g., 15.32. 



Figure E-11. Reading and recording reversing 

 thermometers. 



stem is read to the nearest one-hundredth de- 

 gree; the auxiliary to the nearest tenth degree. 

 The I'ecorder enters the vahie on the A-Sheet in 

 the appropriate cohimns. Space is available for 

 recording both readings {1) and (S) of the 

 main [Main, {T')) and auxiliary {Aux. {t)). 

 Record the auxiliary temperatures with small 

 nmnbei-s in the lower half of the spaces pro- 

 vided. If a thermometer malfunctions by flood- 

 ing, separating, etc., enter type of malfunction 



in the Main (T') column. If the two main tem- 

 perature readings for a thermometer differ by 

 more than .02°, reread the main and auxiliary 

 thermometers and agree on the correct reading. 

 After the temperatures have been read and re- 

 corded, drain the bottles, invert in the rack, and 

 rearrange as necessary for the next cast or sta- 

 tion. Inspect thermometers for mercury drain- 

 age from the main stems. Notify the bridge that 

 the operation is completed. 



E-5 Maintenance and Storage of Nansen 

 Bottles, Reversing Thermometers, and Water 

 Sample Bottles. — At the end of the survey and 

 during extended periods of downtime or adverse 

 sea conditions, Nansen bottles, thermometers, 

 and water sample bottles should be cleaned and 

 stored as follows : 



Step 1. After removing thermometers, rinse 

 Nansen bottles with warm fresh water. Lubri- 

 cate all movang parts with oil, and lubricate 

 valves with silicone grease. Store Nansen bot- 

 tles in Nansen bottle rack or in their shipping 

 cases. 



Step 2. Wash thermometere thoroughly with 

 fresh water. Be sure to flush out the jacket of 

 the imjjrotected therm ometere. Dry thermom- 

 eters and store in the carrying case placing the 

 reservoir end doion, unless the stored thermom- 

 eters will be subjected to temperatures colder 

 than —10°. Note: When handling and storing, 

 avoid placing thermometers in a horizontal 

 position. 



Step 3. Rinse water sample bottles with fresh 

 water and place in storage cases. 



E-6 Subsurface Wire Angle Indicator.— 



Numerous devices have been designed to meas- 

 ure the Nansen cast subsurface wire angle. One 

 of these devices is the subsurface wire angle in- 

 dicator shown in figure E-12. This device indi- 

 cates the angle of the wire and the direction it 

 is tending. Instructions for operating the sub- 

 surface wire angle indicator follow : 



E-7 Instructions for Operating the Sub- 

 surface Wire Angle Indicator. — When sub- 

 surface wire angle indicators are to be used on 

 the Nansen cast, space for recording the data 

 should be provided when the Log Sheet-A is 

 being prepared. For example, if three wire 

 angle indicators are to be used on a cast, deter- 

 mine the wire length depth for each indicator 

 and make the following entries on the log sheet : 



Nansen Bottle No. column. Leave one line on 

 the A-Sheet between the two Nansen bottles 

 where the wire angle indicator (WAI) will be 

 placed. Enter WAI No.l, 2, or 3 and mark the 

 number on the instrument wnth waterproof ink. 



Wire Length Depth (L) column. Enter wire 

 length depth. 



