roswell

b. The construction by the contractor of an experimental air
borne radio and associated air borne or grol:lnd receiving
eqJipment which will transmit and receive information from
a mechanical movement introduced into the radio circuit.
The weight of the pick up device and any required power
npply to be carried in the balloon will not be' over 2 lbs.
2.
c. The contractor will fly the balloons, track them, and collect
the data on pressure and temperature to be transmitted as
the balloon goes up and at periodic intervals at flight
altitude. These intervals to be determined by consulta-
tion, The accuracy is to be comparable to that of the
standard Army Radiosonde.
d. Interpretation of Meteorological data in connection with
project.
Five copies ·Of reports of design and development phases were to
be delivered at monthly intervals. Results of meteorological
studies were to be transmitted as completed to the sponsoring
agency for use of Air Force scientific personnel.
On 27 February 1948, Modification #l revised the number of copies
of reports to be .fumished to 2$. Modification #2, of 2 April
1948, added the requirement of "Research Investigation, and
Engineering services leading to the determination of the dependance
of the propagati~n of sound on atmospheric conditions", to the
contract. Contract f 11nds were increased to cover this additional
requirement.
Under Modification #3 of 23 April 1948,it was agreed that a
separate final report on telemetering from Balloon Systems would
be completed and transmitted to the sponsor. The time of performance
vas extended to 1 February 194~ and contract funds increased to
cover the increased period of performance by Modification #4 to
the contract on 29 September 1948.
On 28 October, 1948, the nUllber of reports required was increased
to fifty (50) and the pl~ce for final inspection and acceptance
charged to Cambridge Field Station, AMC by Modification #5. Modifica-
tion #6 changed the allotment for funds to be used on the project.
The period of performance of the project was extended to So March
1949, by Modification #7 of 26 January 1949.
Modification #8 of 8 April 1949, modified the requirement to that
of maintenance or one trained person in the field to carry out
balloon launching and tracking services in conjunction with Air
Force scientific personnel. Funds were increased to extend the