BACKUP BALLAST 

 RELEASE 



STATICALLY 

 FED PISTON 



CENTRAL 



ELECTRONICS 



BOTTOM CHAMBER 

 ASSEMBLY (1 OF 3) 



BACKUP BUOYANCY 

 RELEASES (PRIMARY 

 AND SECONDARY) 



FLOATATION 



~30m 



ACOUSTIC 

 COMMUNICATION 



KEVLAR 

 BALE 



RELEASE SYSTEMS 



AND-CENTRAL 



ELECTRONICS 



BOTTOM CHAME 

 ASSEMBLY 



LAST- 



A 



POP-UP 



\ ; CAMERA 



1m 



Figure 40. — MANOP Bottom Lander, top and side views. To 

 show the underlying structure, the floatation and 

 Kevlar bale have been omitted from the top view. 



pore-water and sediment geochemists. Preliminary results sug- 

 gest considerable vertical migration of dissolved manganese and 

 iron, as well as other transition metals. 



Manganese Nodule Data 



Manganese nodule data received during the period of this 

 report are available from NGSDC as follows: 



University of Washington, Ecole des Mines — J. Murray, 

 J. Monget, 2,200 chemical analyses of manganese nodules 

 on magnetic tape. 



Manganese Nodule Bibliography 



Andrews, J. E., M. Morganstein, C. D. Fein, M. A. Meylan, 

 S. V. Margolis, G. Anderman, and G. P. Glasby. 



1972. Investigations of ferromanganese deposits from the 

 central Pacific. Hawaii Inst. Geophys. Rpt. No. HIG-72-23, 

 133 p. 



Burnett, W. C, and M. Morgenstein. 



1976. Growth rates of Pacific managanese nodules as de- 

 duced by uranium-series and hydration-rind dating tech- 

 niques. Earth Planet. Sci. Lett. 33:208-218. 



Greenslate, J. 



1977. Manganese concretion wet density; a marine geochem- 

 istry constant. Mar. Min. 1 (1 & 2):125-148. 



Figure 41. — Water flow diagram for each of the three bottom 

 chamber experiments. All valves and pumps are 

 actuated by stepper motors under microprocessor 

 control. Flow through the 4-way bypass valve in 

 its normal position is shown by the solid lines; 

 dashed lines show the flow through this valve in 

 the bypass position. 



67 



