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B. The improvement of radio transmitter gear; it is planned to utilize the three megacycle transmitter developed in the Electrical Engineering Laboratories at New York University. ln previous tests, this has provided clearer reception and a longer range for comparable weight than either the 72 megacycle or 397 megacycle units previously used. To provide direction finding, 397 megacycle carrier signal will also be transmitted which will be tracked by SCR-658 sets. It is also hoped that a better light weight battery pack can be developed for airborne use. c. The Olland cycle time-interval method of presssure measuring and data presentation is being adapted, -with the following advantages anticipated: {1) The direct interpretation of pressure data in tenns of' the time interval eliminates the ambiguities inherent in counting pressure contacts in the Diamond- Hinman system. Used in conjunction with the Brush re- corder operating at medium speed, and with four turns on a helix rotating once a minute, the pressure read- ability of' this system will be better than one millibar. (2) Under noisy conditions the recorded data obtained with this system will be more readable than the audio signal now being employed. When only pressure data is being transmitted, this system can l:e more economical of' power than is a system of' modulated audio frequencies. {3) In cases where data o~her than pressure is also to be transmitted on the same radio channel, the pressure - 33 -