SQUARE ROD LAKE SEDIMENT CORER

1. key: hard steel 3/16" thick x 1" long soldered in a slot cut through the 5/8" stainless steel rod (3)
2. head disk: 1 1/4" OD with square hole (11/16") and two 3/16" slots through which keys (1) pass, and two raised (1/4" high) stops (2a). Head disk is welded to (4)
3. square rod: stainless steel 5/8" - threaded at each end to accept drive stem, and at core-end rounded (.620" dia) from 1/2 below key(1). Opposite end threaded accept end piece (8)
4. corer head, 6" long 1 1/4" OD 1" ID at upper end (where brazed to the head disk [2]), opposite end 1 7/8" OD (with 2" OD shoulders, 1 1/4" from end), 1" ID, 1 7/8" OD end cap welded to end
5. 3/16" hole drilled through head to accept cable to piston
6. 20-guage steel tube 2" OD, 122 cm long
7. 3/8" holes in steel tube for water
8. 7/8" dia end piece bolted to end of square rod (3)
9. hole in piston bolt to which cable is secured (cable passes through [5])
10. piston: 1/2" bolt 3" long with hole (9) at one end, screwed into aluminum point (11) at opposite end and fitted with two 2" dia rubber stoppers expanded by 3 bolts and 1" dia washers