. Bell telephone magazine . -ai>ier which simulate those found aloft electrical trainer. Preliminary workfor the circuit engineers involved astudy of aerodynamics, and the work-ing out of equations which wouldconnect throttle opening, propellerpitch, elevator setting, and plane loadwith rate of climb—to name only oneset of relations. When installed in astationary mock-up of the airplaneinterior, complete with noise and vi- Telephoyie relays., vacuum tubes, and switches{below) interconnect the controls and instruments ofthe flight trainer. Right: Pilot and co-pilot, at thecontrols of the Nav
. Bell telephone magazine . -ai>ier which simulate those found aloft electrical trainer. Preliminary workfor the circuit engineers involved astudy of aerodynamics, and the work-ing out of equations which wouldconnect throttle opening, propellerpitch, elevator setting, and plane loadwith rate of climb—to name only oneset of relations. When installed in astationary mock-up of the airplaneinterior, complete with noise and vi- Telephoyie relays., vacuum tubes, and switches{below) interconnect the controls and instruments ofthe flight trainer. Right: Pilot and co-pilot, at thecontrols of the Navy trainer, can ejicounter all theproblems—and most of the sensations—met i>i actual flight. I20 Bell Telephone Magazine SUMMER bration, the effect was so realistic thatmore than one experienced flyer leftthe ship in a sweat after the in-structor had given him a real work-out. As MIGHT be expected, the Labora-tories long experience with vacuumtubes was of great value to the wareffort. Out of all the electronic de-velopment which was going on, onesmall but dramatic incident group of repeater stations hadbeen captured in Germany, intact ex-cept for the tubes. Signal Corpsmen, ransacking employees lockers,had found one tube which fitted thesockets. In a few days that tube wasin the Laboratories; in three daysmore, eight replicas had been builtand were on their way to the frontfor service tests. Western Electric did not wait for results to filter back, however; theyturned out a thousand tubes in threeweeks. Confidence In the Labora-tories was well rewarded; the designwas right, and the tubes restoredservice on an Important European ca-ble route. One of the Laboratories
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