. Bell telephone magazine . 0. Large quantities of Bell Labora-tories developments were supplied bymany other manufacturers. The re-quirements for some types were solarge that it was necessary for theServices to obtain production fromseveral manufacturers. In the caseof an intermediate-frequency ampli-fier tube—the 6AK5—there werefive suppliers in addition to Laboratories electronics de-velopments covered the wave bandfrom 40 centimeters to i centimeterand every radar electronic functionexcept display. The cathode-raytubes used in the video system to dis-play the radar pictures we
. Bell telephone magazine . 0. Large quantities of Bell Labora-tories developments were supplied bymany other manufacturers. The re-quirements for some types were solarge that it was necessary for theServices to obtain production fromseveral manufacturers. In the caseof an intermediate-frequency ampli-fier tube—the 6AK5—there werefive suppliers in addition to Laboratories electronics de-velopments covered the wave bandfrom 40 centimeters to i centimeterand every radar electronic functionexcept display. The cathode-raytubes used in the video system to dis-play the radar pictures were devel-oped by others. While the Labora-tories electronics programs werecarried out under Army and Navycontracts, they were closely integratedwith those of the NDRC. In author-izing a program in one of the newwave length sectors, the Bureau ofShips wrote in part: The Bureau ex-pects the Western and Bell Labora-tories to assume the same responsibili-ties in the development and manu-facture of the electronic devices for. The 6AK5, one of the most importantvacuum tubes developed for radar use th e new band as have been car- ried so well in the other bands. Bell Laboratories contribution tothe development of the many othertypes of components, circuit elements,and coaxial cable and wave guidetransmission interconnectors was asbroad in scope and as fundamentalto all centimeter-wave radars as wereits electronic developments. Radar Systems—Designed forService The radar systems operating in thewave band from 40 centimeters to icentimeter made the first general useof this vast range of the radio spec-trum. For several years before1940, research in Bell Laboratorieswas probing this wave band to de- 248 Bell Telephone Magazine WINTER termlne Its value to volume of this research was inbalance with the many other sectorsof the research program. With the advent of radar and war,Bell Laboratories expanded this re-search effort several fold, and thescientists at the Ra
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