3 foot diameter balloons, no attachments excepting an inflation tube or appendix made of the balloon film about 10 inches long and 1.4" diameter.
2 each made from Polyethylene PM-1 film .004" thick
2 each made from Polyethylene PM-1 film .008" thick
2 each made from Saran type M film .00225" thick
15 foot diameter balloons with inflation tube 4" in diameter and 12" long, also means for attaching rigging lines supporting a 25-pound load to bottom of balloon and means for attaching auxiliary lifting balloons to top of balloon. If possible, balloon should be capable of withstanding internal pressure equivalent to 2" water.
5 each made from Polyethylene PM-1 film .004" thick
5 each made from Polyethylene PM-1 film .008" thick
5 each made from Saran Type M film .00225" thick
(1) The balloon film should be treated before or after manufacture in such a way as to seal all pinholes.
(2) A patching kit should be furnished for use of the balloon flight personnel.
(3) It is desired that either the volume of the 15 foot balloons be known to within 10 to 20 cubic feet when fully inflated or that the volume, though unknown, be nearly the same for each of the balloons of this size (differences in volume should not exceed $ \pm 1 \% $ of the total volume of a mean balloon).
Delivery was made 20 April 1947 on the first 3 foot balloons, two 15 foot balloons are expected by the end of May.
In an attempt to interest another manufacturer in the problem, the following companies were contacted.
Company Type of Company Interested? Disposition
Dobeckman Co.
500 Fifth Avenue, NYC Plastics & Packaging No None
Kennedy Car Liner & Bag
Co. Shelbyville, Ind. Plastics & Packaging No None