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Published online by Cambridge University Press: 14 August 2015
Apparatus for measuring changes in the received intensity of 18–Mc/s cosmic noise has been in operation at the Sampson Station of the Observatory of Rensselaer Polytechnic Institute since 1957 February. It is similar in principle to the equipment of the High Altitude Observatory on which is based the contribution of the Warwicks [1] to this Symposium.