PEN ARM IS ON SHELF UNTIL BALLOON RISES ABOVE 25,000 FT. WHERE IT FALLS ON TO THE COMMUTATOR. WHEN THE BALLOON DESCENDS THE PEN ARM RIDES DOWN ON COMMUTATOR UNDER THE SHELF, CLOSING THE CIRCUIT AT 20,000 FT.
SHELF DETAIL
3/32" BRASS WIRE
1/4"
1/8"
1/4"
1/16"
SILVER SOLDER
2-56 NF
PEN ARM
SHELF
COMMUTATOR OPEN ABOVE 45TH CONTACT
Nº2 SHAKEPROOF LOCK WASHERS UNDER TOP AND BOTTOM NUTS
ANEROID CELL
12" WIRE LEADS—20 GAGE STRANDED WIRE
LINKAGE DETAIL
BRACKET HOLDS PEN ARM CAPTIVE
CIRCUIT CLOSES ON DESCENT TO 20000' STANDARD ATMOSPHERE
TO SQUIB CANNON
FIG. 12
NYU BALLOON PROJECT
FLIGHT TERMINATION SWITCH
DATE 7-27-48 ED48-70A
NOTE: MFD BY KOLLSMAN
-24-