Undated: HYDRA Control Position Design and Operating Concepts

The conversion from manual torn-tape relay facilities to automatic switching facilities meant that HYDRA operators also had an entirely new set-up to deal with. This report on the design and operating concepts of the new HYDRA control position at EASE is a kind of user’s guide for the new HYDRA console.  

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Fixed Communications - Hydra Telegraph Relay System - Relocation of Hydra - Plans and Policy, RG24, S-2723-2, Vol. 1, Library and Archives Canada (LAC)