A mercury thermometer in the neck of the flask was used to record the boiling point.
(A mercury thermometer in the neck of the flask; was used; to record the boiling point) (A mercury thermometer in the neck of the flask; to record; the boiling point)
A mercury thermometer in the neck of the flask A mercury thermometer in the neck of the flask
was used to record
to record the boiling point
the boiling point