IMPROVEMENTS IN APPARATUS FOR REGULATING, ADJUSTING, AND COMPARING THE STANDARDS OF MEASURES
Year: 1869

page_text: LETTERS PATENT to Alfred Tylor, of Newgate Street, in the City of
London, Brassfounder and Standard Measure Manufacturer, for the
Invention of "IMPROVEMENTS IN APPARATUS FOR REGULATING, ADJUSTING,
AND COMPARING THE STANDARDS OF MEASURES."
Sealed the 25th January 1870, and dated the 5th August 1869.
PROVISIONAL SPECIFICATION left by the said Alfred Tylor at the
Office of the Commissioners of Patents, with his Petition, on the
5th August 1869.
I, ALFRED TYLOR, of Newgate Street, in the City of London, Brass-
founder and Standard Measure Manufacturer, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN APPARATUS FOR REGU-
LATING, ADJUSTING, AND COMPARING THE STANDARDS OF MEASURES," to be as
follows:-
r
Hitherto the practice has been to adjust the standards of measures or
standard measures by means of a vessel of suitable capacity open at top,

page_text: such vessel being carefully levelled, and when filled with water covered
with plate glass, the accuracy of the measure being indicated by the size
of the bubble seen through the glass. By this arrangement the accuracy
of the measure after it is filled can only be roughly or approximately
estimated, owing to the difficulty of entirely freeing the vessel again
from the water or liquid used to test it.
Now my Invention has for its object the accurate measurement of the
liquid before it is passed into the vessel to be tested, and consists in the
use of an apparatus furnished with a base plate or level foundation, on
which the vessel to be tested is intended to be placed, and having fitted
over it a hollow vessel of the requisite capacity containing a float or
floats working in a tube or tubes very nearly equipoised, and nearly
filling up the tube or tubes at the top or sides of the vessel furnished
with a graduated flat wire or scale, so as to be capable of indicating
with accuracy the exact amount of fluid in the said hollow vessel. Then
as a still further security for accuracy there is connected with the said
hollow vessel and fitted over it a hollow cylinder of indefinite capacity,
being open at the top, and having an outlet in the bottom cover or some
other part leading by a pipe to the said first-named hollow, vessel fitted
under the cylinder, or direct to the vessel required to be tested: There
are two graduated glass tubes with floats nearly filling up the tube, to
serve as indicators of the level of water in the hollow cylinder, one on
each side of the cylinder, and a plug of definite displacing capacity is
inserted at or let down through the top of the hollow cylinder, and the
level of the liquid read off from the glass tubes. In this manner the
displacement or the quantity drawn off can be accurately estimated.
When the water or liquid is discharged from the first-named vessel into
the measure to be tested a certain quantity will remain. This remanet
can be correctly estimated by filling the vessel again with a given
quantity of water, as the excess of water will be indicated on the scale.
By this arrangement the water or liquid is or may be measured twice
over, and the accuracy of the measurement tested and ascertained as
required before it is passed, into the vessel or measure that has to be
.guaged.