EFFECT OF ORGANIC SUBSTANCES ON OYSTERS 



185 



<^IIOVolt, 60 Cycle 



Coupling with set screws, 

 motor drive to shaft 



Collar,with set screw 

 Thrust bearing 



lltfxltf 

 n/ 6 4 Shaft 



^-Remov able top 



Moist chamber 



-S 



I I 1 1 11 ii 



i i i ii |i ii dt- 

 i i i ii ii n-»H 



II I f t I Ml 



SI. 32S£Sf3 



5: 



15 ml. centrifuge 



tubes 



-Absorbent 



Drain 



Top View, To p Removed 



J/* Marine plywood 



Holes size of centrifuge 

 tube buckets 



O 6 12 18 



U1J1-1U U1-1UU1-1I 

 Scale in Inches 



Figure A-2. — Device for automatically sampling water at hourly intervals. Operated by a synchronous motor, it was 

 so designed as to rotate one of the 25 tubes under the inflow pipe each hour. 



U. S. GOVERNMENT PHINT1NC OFFICE: 10SS 



