Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid

Child Classifications

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• G01L 23/02 mechanically indicating or recording and involving loaded or return springs
• G01L 23/04 involving means subjected to known counteracting pressure
• G01L 23/06 Indicating or recording by optical means
• G01L 23/08 operated electrically
• G01L 23/20 combined with planimeters or integrators
• G01L 23/22 for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
• G01L 23/24 for measuring pressure in inlet or exhaust ducts of internal-combustion engines
• G01L 23/26 Details or accessories