Try to get some melting point standards and use those to calibrate. Unfortunately, because they use Mercury thermometers Fisher Johns have become obsolete. Electronic (digital) units are available as replacement.
Fisher-Johns apparatus is mainly used to measure the boiling point
Bonnie Johns's birth name is Bonnie Jean McIntosh Fisher.
Mostly St. Johns and j. Renee shoes.
Sammy Jessop's birth name is Samantha Jessop.
Val Johns's birth name is Valjean Johns.
Daniel Johns's birth name is Daniel Paul Johns.
Margo Johns's birth name is Jessie Margaret Johns.
Cort Johns's birth name is Cort Maclean Johns II.
Hugh Johns's birth name is Hugh Richard Lewis Johns.
Stratford Johns's birth name is Alan Edgar Stratford-Johns.
Johns Hopkins
Barbara Rose Johns died in 1991