Improvements in Low-pressure Water Meters.
Year: 1890

page_text: Date of Application, 28th July, 1890-Accepted, 30th Aug., 1890
COMPLETE SPECIFICATION..
Improvements in Low-pressure Water Meters.
1, WILLIAM COULSON PARKINSON of Cottage Lane, City Road, in the County of
London, Gas and Water Meter Manufacturer, do hereby declare the nature of this
invention and in wliat manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
This invention has reference to improvements in that kind of meter generally
known as Parkinson's low pressure water meter, and has for its object the production
of means whereby the meter when passing but a small quantity of water in propor-
tion to its size will register with greater accuracy than in ordinary meters, the
water so passed.
1
In order that the invention may be easily understood drawings are attached hereto
of which the following is a description. Fig. 1 is a front elevation of the inlet
chamber of a water meter with the front plate removed. Fig. 2 is a transverse
section through A, B, of Fig. 1 and Fig. 3' is a part plan showing the holes leading
to the water conduits.
In the larger sizes of ordinary low pressure water meters, such as those referred to,
only a definite proportion of the water passed is measured, while the remainder flows
through bye-pass holes or apertures of similar area direct to the cistern.
As hitherto
made, with only one row of holes C, C, placed at a given height there is the liability
of an undue proportion flowing through the bye-pass holes when the meter is
passing but a small quantity in relation to its size. To obviate this imperfection,
I make another row of holes D, D, at a different level and of smaller area, arranged
as seen in the drawing, each hole communicating with a channel of exactly the
same size and shape as the others. The central holes E and F in both tiers lead to
channels which convey the water through the spout to the measuring chamber,
while all the other holes lead the water through their respective channels direct to the
cistern.
The action in the old apparatus is as follows. The water enters by the inlet
pipe G passes through the valve at H and goes into the inlet chamber I where,
(supposing anything like the full quantity is being passed) it rises over the top
of the series of holes (and from thence flows away to the measuring chamber
and cistern. Supposing however the quantity being passed is small, the water
will rise to the holes, but in consequence of the want of velocity there is the
liability of a greater proportion escaping by the holes than by the hole E and
therefore the meter will register slow. To obviate this I place in the new or
improved apparatus the series of holes D and conduits J, so that when a small
quantity only is passing, although the velocity may not be so great, it will be
sufficient when the water rises to the top of the lower series to flow away by the
holes D and the hole F in the required proportions, when the meter will, as
a consequence register accurately.
Although but one additional series of holes is shown in the drawing, each meter
may have several such series, each series varying in height, and the area of their
boles.
LI
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page_text: invention, and in what manner the same is to be performed, I declare that what I
claim is :-
The construction of water meters with two or more series of holes C and D and E
and F, each series being placed at different levels and having holes varying in area,
and as herein described and shown on the drawings.
Dated this 28th day of July 1890
W. H. BENNETT,
Agent for the Applicant.