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During the year the Department of Scientific & Industrial Research,
Warren Spring Laboratory produced a simplified eight part valve for
use with the daily volumetric instruments for measurement of smoke
and sulphur dioxide.
This device eliminates the need for daily replacement of the smoke
filter and hydrogen bubbler by automatically switching the air intake
every 24 hours so that it passes through a different filter and bubbler.
A sequence of up to eight consecutive daily measurements can be made
in this way without attention, this ensuring complete records over
week-ends and holidays. In addition considerable time is saved in
visiting the instruments.
About 12 valves were produced and loaned to local authorities for
trial use. One was installed at Croft Lodge Close and has operated
satisfactorily to date.
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