13 December 2011

Wed 3rd Dec 1941: crystal music expensive

Very raw cold, damp, dismal, misty. Being early closing did shopping in morning. The weather being so foul and not having any business to do in afternoon stayed at home. Alan Spooner called to tell me he knew the principle of the crystal pick-up which has puzzled me: he explained that a Rochelle salt crystal of special size and shape made only in America was used - the crystal actually generates voltage pulsations under varying pressures, the vibrations being applied by the needle mechanisms of the pick-up. Should like to try one but they are very expensive. Staretd making bamboo landing chassis for Williams aero.
On this day: Sagadahoc, a USA merchant ship, torpedoed and sunk in South Atlantic.

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