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Basil Martin Wright (20 December 1912 – 4 March 2001) was a British bioengineer who invented several notable medical instruments, including the peak flow meter and syringe driver. The "alcolmeter" he developed won a Queen's Award for Industry and is the breathalyser most often used at the road-side in the United Kingdom.
The peak expiratory flow (PEF), also called peak expiratory flow rate (PEFR) and peak flow measurement, [1] is a person's maximum speed of expiration, as measured with a peak flow meter, a small, hand-held device used to monitor a person's ability to breathe out air.
MMEF or MEF stands for maximal (mid-)expiratory flow and is the peak of expiratory flow as taken from the flow-volume curve and measured in liters per second. It should theoretically be identical to peak expiratory flow (PEF), which is, however, generally measured by a peak flow meter and given in liters per minute. [16]
1959 Wright B. M. and McKerrow C. B. introduced the peak flow meter 1969 DuBois A. B. and van de Woestijne K. P. experimented on humans using the whole body plethysmograph 1974 Campbell et al. refined the previous peak flow meter, developing a cheaper and lighter version [ 2 ]
Because they are used for domestic water measurement, piston meters, also known as rotary piston or semi-positive displacement meters, are the most common flow measurement devices in the UK and are used for almost all meter sizes up to and including 40 mm (1 + 1 ⁄ 2 in). The piston meter operates on the principle of a piston rotating within a ...
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A velocity-type meter measures the velocity of flow through a meter of known internal capacity. The speed of the flow can then be converted into a volume of flow to determine the usage. There are several types of meters that measure water flow velocity, including jet meters (single-jet and multi-jet), turbine meters, propeller meters and mag ...