| 摘要 |
A device for aiding in the location of a person or object comprises a balloon connected by a valve to a container for a pressurized gas lighter than air, all of which are disposed within a casing in which a tethering line for the balloon is disposed and held closed by a releasable strap and lid which also holds the valve closed and which is operative to permit escape of the balloon and gas container from the casing whilst simultaneously opening the valve to admit gas into the balloon whereby the inflated balloon with the gas container connected thereto can rise into the air at one end of the tethering line.
|
