to the assembly frame. The top and bottom 

 caps of the battery case are pressure sealed 

 with 0-rings. The microswitch is actuated 

 by a U-magnet mounted outside the battery 

 case on a movable connecting arm. The con- 

 necting arm is attached to a sliding sleeve at 

 the bottom of the assembly frame. If a soft 

 bottom condition is expected, a circular per- 

 forated brass foot plate is attached to the 

 bottom of the assembly frame to prevent 

 excessive burial of the unit with resultant 

 damage to the external mounted components 

 of the camera. 



A Phleger-type coring tube is attached to 

 the sliding sleeve with a threaded union. This 

 coring tube uses a plastic liner, core catcher, 

 and cutting edge similar to those described in 

 section 6-12. Contact with the bottom forces 

 the coring tube, sliding sleeve, connecting arm, 

 and U-magnet upward. This actuates the 

 microswitch which in turn fires the camera and 

 photoflash bulb. 



7-5 Equipment Needed to Operate the 

 Single-Shot Bottom-Contact Camera. — In ad- 

 dition to the assembly described above, the 

 following components are needed to operate 

 the camera. 



1. Roll film, size 616, panchromatic plus X or 

 super XX. 



2. Photoflash bulb, size No. 50. 



3. Dry cell flashlight batteries. 



7-6 Spare Parts Needed for the Single-Shot 

 Bottom-Contact Camera. — The following spare 

 parts are needed to operate the camera. 

 Quantities are dependent upon the data re- 

 quirements of the survey. 



1. Roll film, size 616, panchromatic plus X or 

 super XX. 



2. Photoflash bulbs, size No. 50. 



3. Dry cell flashlight batteries. 



4. Camera lens assembly. 



5. Spring for camera pressure case cover. 



6. Two coil springs for camera shutter. 



7. Glass pressure housing for photoflash unit. 



8. Microswitch assembly. 



9. Eight stainless steel bolts for camera 

 pressure-case cover. 



10. Six brass bolts for spark-plug connectors. 



11. Six plastic insulators for spark-plug 

 connectors. 



12. Two 0-rings for camera pressure case; 

 2 for photoflash pressure case; 2 for battery 

 pressure case; 12 for spark-plug connectors. 



13. A small tube of stopcock grease. 



14. Thirty feet of rubber-covered, watertight, 

 single-conductor, electrical cable. 



15. Two rolls of electrical waterproof tape. 



16. Six rolls of rubber tape. 



17. Two tubes of weatherstrip adhesive. 



18. A spare coring tube. 



19. Four core catchers 



20. Four cutting edges. 



21. Plastic liner, l^-inch outside diameter. 

 Enough lengths as needed to conduct survey 

 program. One liner is needed for each sample. 



22. Rubber stoppers, solid, size No. 7. Two 

 stoppers are needed for each sample. 



23. Bottom sample jars. Enough sample 

 jars as are needed to conduct the survey pro- 

 gram. One sample jar is needed for each bit of 

 sample. 



24. Glass wool, used to pack the unfilled 

 portion of the plastic liners above the core 

 samples. 



25. Small bags of desiccator (silica gel) to 

 place in camera case, photoflash case, and 

 battery case when storing. 



7-7 Tools Needed to Operate the Single- 

 Shot Bottom-Contact Camera. — The following 

 tools are needed to operate and maintain the 

 camera. 



1. Pliers, 8-inch combination. 



2. Screwdriver, large. 



3. Screwdriver, small. 



4. Strap wrench. 



5. Adjustable end wrench. 



6. AUen wrenches. 



7. Test lamp for photoflash socket and 

 electrical circuit. 



8. Oil can. 



9. Sharp knife or small saw for cutting plastic 

 liners. 



10. Steel wool. 



11. Rags for cleaning. 



12. Lens tissue. 



7-8 Assembling the Single-Shot Bottom- 

 Contact Camera for Operation. — Remove the 

 cover plate from the camera pressure case and 

 take out the desiccator bag. Clean the pressure 

 lens with lens tissue. Clean the banana plugs 

 in the case. Remove the photoflash glass case 

 and take out the desiccator bag. Clean the 

 flashbulb socket. Remove the bottom cap of 

 the battery case and take out the desiccator 

 bag. Inspect all electrical wiring and contacts. 

 Check the movement of the sliding sleeve and 

 U-magnet. Check the action of the microswitch 

 when the U-magnet passes over it. 



Insert four new flashlight batteries in the 

 case. Coat the 0-ring in the cap with a very 

 thin even layer of stopcock grease and hand 

 tighten the cap onto the case. 



Insert the test lamp into the flashbulb socket. 

 A simple test lamp can be made by wiring a 6- 

 volt flashlight bulb into the base of a used 

 photoflash bulb. 



74 



H. O. 607 



