How did Gabriel Farenheit discover his method of measuring temerature?

Tabby Tom

Tabby Tom says: According to Encyclopaedia Britannica: 'The 18th-century German physicist Daniel Gabriel Fahrenheit originally took as the zero of his scale the temperature of an equal ice-salt mixture and selected the values of 30 degree and 90 degree for the freezing point of water and normal body temperature, {respectively;} these later were revised to 32 degree and 96 degree, but the final scale required an adjustment to 98.6 degree for the latter value.' Tue Nov 27 01:03:29 CST 2001 (To fix characters - McG) Apr 15 03, 7:03 AM