| 摘要 |
PCT No. PCT/AU86/00095 Sec. 371 Date Feb. 10, 1987 Sec. 102(e) Date Feb. 10, 1987 PCT Filed Apr. 11, 1986 PCT Pub. No. WO86/06041 PCT Pub. Date Oct. 23, 1986.A position indicating device (10) including a capsule (11) of lighter-than-air gas, a balloon envelope (13) and a connection and release assembly (12) securing the balloon envelope (13) to the capsule (11). The connection and release assembly (12) includes an actuator (29) which may be rotated to cause the capsule (11) to be pierced and permit gas to escape into the balloon envelope (13) and a release pin (46) to release the balloon envelope (13) when inflated. The height of elevation of the balloon envelope (13) is governed by a tether (21).
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