Philadelphia Instruments & Controls Inc.
4401 North Sixth Street
Philadelphia, PA 19140
USA
(215) 329-8828 voice
(215) 329-0729 fax
Toll Free
(800) 863-9351 voice
(800) 245-1782 fax
The degree centigrade (°C) was officially renamed Celsius in 1948 to avoid confusion with the angular measure known as the centigrade (one hundredth of a grade). The Celsius scale is named after the Swedish astronomer Anders Celsius (1701–1744), who devised it in 1742 but in reverse (freezing point was 100°; boiling point 0°).
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