Publisher's Synopsis
Excerpt from The Technology Monthly Engineering Journal, Vol. 3: February, 1917
During these later years an American, S. P. Langley (1834 - 1906) had been carefully preparing an instrument which he later misnamed, perhaps, the Actinic balance. In 1881 and the years following he improved 'and bettered it to such an extent that it was the most sensitive instrument known for its time.
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