roswell

bursting at pressure altitude.
A series of for.ms which have been used to facilitate computations
have been drawn up. They are included in Appendix 3, together with a table
6
of altitudes based on the N.A.C.A. Standard Atmosphere , and other useful
reference tables.
Glossary
Equipmen~ load: Weight of all equipment, rigging, and ballast hung from
the balloon shrouds not including balloon or its integral
parts.
Gross load: Load on the gas at release (Balloon plus equipment load weight).
Free lift: Net lift of the balloon with the equipment load attached.
Gross lift: Lift of all of the gas in the balloon at release (Equals weight
of the balloon, equipment load plus the free lift).
Balloon inflation: Gas inflation to be given the balloon in terms of
initial lift of the balloon (equals weight of equip-
ment load plus free lift plus allowance for gas
losses before launching).
Floor: The locus of altitudes at which a balloon will float when lift
losses are exactly compenseted for on a demand basis by ballast
dropping. In practice, this is deter.mined bythe operation of
the automatic ballast release and is some altitude below the ceiling.
Ceiling: The locus or pressure altitudes at which a non-extensible balloon
will float When gas losses are slightly over-compensated for by
ballast losses.
Pressure Altitude: The altitude at which a non-extensible balloon becomes
fully inflated.
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