taking the same amount of distilled water of dissolved half the amount of sodium chloride and repeated freezing. that third mark was exactly between the first two. he repeated the process with 75% and 25% solutions and continued until he ran out of room. counting up from zero (the freezing point of salt saturated water) to the second mark he made he reached 32 (the freezing point of distilled water). the world wide demand for this by professionals made high quality versions of the new scale available everywhere at low cost.
United States