Figure 2-17. View of spacing plugs. 



the bottles in the rings so the bottle and ring 

 numbers match. 



2-68 To Insert the Smoked-Glass Slide.— 

 Insert a smoked-glass slide in the slide holder 

 aft of the bottle frame, as shown in figure 2-18, 



Figure 2-18. 



View of smoked-slide holder with stylus 

 raised. 



and rotate the sleeve about a quarter turn to 

 let the stylus rest on the slide. The sea sampler 

 is now ready to be lowered. 



2-69 Lowering the Sea Sampler. — The 

 procedures for lowering the sea sampler and 

 bathythermograph are essentially the same. 

 The sea sampler, however, is much heavier 

 than a bathythermograph, weighing approxi- 

 mately 70 pounds. It is recommended that 

 lowerings be made when the ship is stopped or 

 steaming at very slow speed. 



H. O. 607 



Lower the sea sampler into the water and 

 tow it at the surface while taking a bucket 

 sample and temperature of surface water. 

 Check the depth of the water with the echo 

 sounder. The best results are obtained by 

 stopping the ship and lowering the sea sampler 

 approximately 50 feet below the maximum 

 depth of a 400-foot sampler and 25 feet below 

 the maximum depth of a 150-foot sampler to 

 insure cocking of the deepest sampling bottles. 

 Then get underway at slow speed and bring in 

 the sampler. 



2-70 Marking the Slide and Recording the 

 Data. — Immediately after the sea sampler is 

 brought back on deck, rotate the sleeve so the 

 slide holder is exposed and the stylus raised 

 from the slide. Remove the slide and process 

 it in the same manner as for a bathythermo- 

 graph slide. Mark on the slide, the serial 

 number of the lowering; the Greenwich mean 

 time; and the date, in the order following: Day, 

 month in Roman numerals, and last two digits 

 of the year. On the bottom of the slide, record 

 the letters SS followed by the sea sampler 

 serial number. Dip the slide in lacquer and dry. 



Record the lowering on oceanographic log 

 sheet B together with the associated meteor- 

 ological observations in the same manner as 

 for bathythermograph observations. Instruc- 

 tions for recording these data are given in 

 chapter 14. 



2-71 Sample Depths. — As with the bathy- 

 thermograph, the sea sampler records depth 

 (feet) and temperature (°F.). The sample 

 bottles of the sea sampler are tripped and 

 closed as the sampler is raised to the surface. 

 The tripping mechanism of each sample bottle 

 is actuated by the pressure (depth) element. 

 Because of its construction it is impossible to 

 have each sea sampler trip its bottles at 

 exactly the same depths. Each sea sampler 

 is individually calibrated and supplied with a 

 grid to interpret temperature and depth, as is 

 each bathythermograph, and in addition, each 

 sea sampler must be calibrated for the depth 

 at which the individual sample bottles operate. 

 A calibration sheet giving these sample depths 

 is supplied with each instrument. 



2-72 Drawing the Sea Water Samples from 

 the Bottles. — In general, the procedure for 

 drawing the water samples is the same as 

 given m section 2-28. Because the bottles 

 have no drain petcocks as Nansen bottles do, 

 it is necessary to use a small plastic or glass 

 funnel when draining the water into salinity 

 sample bottles. To rinse the salinity bottles 

 place the funnel in the mouth of the bottle, 

 and by turning the valve knob in one end of 



27 



