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According to Fahrenheit's 1724 article, he determined his scale by reference to three fixed points of temperature.
The lowest temperature was achieved by preparing a frigorific mixture of ice, water, and ammonium chloride ( a salt ), and waiting for it to reach equilibrium.
The thermometer then was placed into the mixture and the liquid in the thermometer allowed to descend to its lowest point.
The thermometer's reading there was taken as 0 ° F.
The second reference point was selected as the reading of the thermometer when it was placed in still water when ice was just forming on the surface.
This was assigned as 32 ° F.
The third calibration point, taken as 96 ° F, was selected as the thermometer's reading when the instrument was placed under the arm or in the mouth.

1.844 seconds.