The Heidbrink meter in Boyle&;s machine
Reduces pressure of gases
Indicates flow of gases
Indicates humidity of gases
It a fixed orifice meter
Heidbrink is a flowmeter used in past. It consists of a metal tapered tube with inveed black float. The upper-end projects in the glass tube. Other type of flowmeter used in past was Connell which has round bobin.
Anaesthetic equipments