IMPROVEMENTS IN GAS METERS
Year: 1877

page_text: PROVISIONAL SPECIFICATION left by Samuel Dalziel at the Office of the
Commissioners of Patents on the 25th April 1877.
SAMUEL DALZIEL, of Kilmarnock, in the County of Ayr, North Britain, Gas
Works Manager. "IMPROVEMENTS IN GAS METERS."
This Invention refers to a more simple and efficient mode of, and certain new or
improved means or appliances for preventing the drawing or draining off of the
water from, or the tampering with, wet gas meters by the consumers; and also the
preventing of the gas from passing through such meters without being duly
measured and registered, all more simply and effectively than heretofore.
And the nature and novelty of the Invention or improvements as applied to the
wet or water gas meters in general use (with very slight obvious modifications to
suit their various constructions) consist essentially as follows:-In lengthening the
inlet bent tube or pipe which conducts the gas through the central opening in the
front end of the revolving drum into its internal measuring chambers, so as to
receive the gas at the upper extreme front part of the waste water chamber or
compartment formed at the lower front part of the meter by its lower open end
passing or dipping a little into this chamber through its upper division or plate,
separating it from the usual supply water space and the gas inlet float valve space
above it, and preferably (as in most meters in use) separated by a vertical gas-tight
division down to near the bottom of these spaces, so that the water can rise to the
same normal level in both chambers, when the pressure of gas above remains
the same in both, this level being regulated as usual by the combined overflow
stand and inlet gas tube leading from the inlet chamber down to the waste water
chamber below, from which the gas flows up the said improved or lengthened pipe
close to the upper and front side. The end of this pipe, under these improvements,
is fitted with a valve on the end of a two-armed or bell-crank lever, fulcrumed near
the knee part to a pendent joint piece at the back of the top of the chamber, fitted
transversely so that the valve remains open when the meter is standing level on its
base in proper working order, but so that the moment is is tilted forward the
weight on the pendent arm of the lever would press the horizontal arm up and
close the valve, so that no gas could escape from this chamber into the measuring
drum or cylinder. The closing of this valve also increases the pressure of the gas
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page_text: in the waste water chamber and in the supply chamber, so as to press the water
down below the top of the overflow pipe and prevent its escape from this chamber,
and raise the level of the water in the water supply chamber, the float valve closing
the gas inlet valve as the level of the water falls in the first chamber and stopping
the supply of gas to the meter, while the water rising in the other chamber and
case of the meter prevents the measuring drum from indicating more gas than passes
through it in this angled position. Before a meter therefore fitted with these simple
additions or improvements can be made to work it must be set level on its base
with the water inside at its normal proper level, thus effectively preventing the
passage of more gas than is actually measured and indicated.