There is now a meter for measuring the intensity of ultraviolet rays. Its inventor, Dr. Harvey Clayton Rentschler (Ph. D.) director of lamp research for the Westinghouse Lamp Co., exhibited it last week at the annual meeting of the New York Electrical Society, as his inaugural demonstration upon assuming the Society's presidency.
Ultraviolet rays, whether from the sun or from mercury or carbon lamps, prevent and cure rickets, are valuable for general well being. But too much of them can cause deep burns and nervousness. They are suspected as the remote cause...
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