Science: Applied Electricity

A bright bazaar, the New York Electrical & Industrial Exposition which began last week, showed that of the 25,000 practical applications of electricity the ones most vigorously exploited are those most useful to housekeepers. They constitute two large groups dependent upon electricity's change into 1) power and 2) heat.

Power Appliances. Electrical refrigeration commercializes a device which the British scientist Lord Kelvin built 30 years ago. With a pump he compressed gases; the gases lost heat. He permitted the gases to expand into a chamber; they absorbed heat from neighboring objects. Such...

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