Olaus Roemer 16441710

1
Olaus Roemer 1644-1710

• Danish mathematician and astronomer
• Made the first good estimate of the speed of
  light
• Used wine as the liquid in his thermometers

• The Roemer scale
• has 60 degrees as the temperature of boiling
  water
• and 7 1/2 degrees as the temperature of melting
  ice

2
Daniel Gabriel Fahrenheit (1686 - 1736 )

• Polish physicist and engineer who spent most of
  his life in the Netherlands
• In 1724 was elected a fellow of the Royal Society
  of London
• Used pure alcohol in his thermometers

• The Fahrenheit scale
• Zero degrees was the temperature of an ice,
  water, and salt mixture.
• When he omitted salt from the slurry, he reached
  his second fixed point at "the thirty-second
  degree
• the third fixed point was "found as the
  ninety-sixth degree and the spirit expands to
  this degree when the thermometer is held under
  the armpit of a living man in good health."

3
Anders Celcius (1701-1744)

• Swedish astronomer, physicist and mathematician.
• built Sweden's first observatory in 1741.
• measured and showed that the Earth was flattened
  at the poles.
• Used mercury in his thermometers

• The Celsius scale
• defines zero degrees as the temperature of
  boiling water
• defines 100 degrees as the temperature at which
  water freezes.
• an inverted form of Celsius' original design, is
  adopted as the standard in almost all scientific
  works.