an amplifier unit has been developed for use with the trrl dynamic weighbridge which provides features additional to those required in the original application for the classification of axle loads. the amplifier has been manufactured and maintained by the laboratory, and at least 10 units are in regular use. a detailed explanation of the operation, together with a schematic circuit diagram is given. considerable detail is also given of the necessary measures employed to suppress electrical interference, which is so frequently a major difficulty encountered when using this type of electronic equipment. (a)

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