Year: 1888

page_text: We, PAUL CLEMENS ILLGEN and PAUL EDUARD KÜRSTEN, both of Leipsic, in the
Kingdom of Saxony and Empire of Germany, Manufacturers, do hereby declare the
nature of this invention and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :-
This invention consists of an improved device for checking the result recorded by
the counter-mechanism employed in speed-indicators, gas- and water-meters, calculating
machines and the like; the object being to provide means whereby the accuracy of the
figures displayed may at any time be tested.
In the accompanying drawings, Fig. 1 is a side elevation, Fig. 2 a sectional end
elevation and Fig. 3 a sectional side elevation of a checking device constructed in
accordance with our invention.
The rotary movement of the shaft A is communicated to the first or unit disc of the
counter-mechanism E in the usual or any convenient manner; a series of other discs,
for indicating the tens, hundreds, thousands and so on, being geared with the unit disc
in the ordinary way. Upon the shaft A a finger or projection B or equivalent con-
trivance is mounted so as to engage with and operate a supplementary disc O. The
latter is divided into any suitable number of parts-in the present illustration 9.
These divisions are marked respectively 0 to S; one numeral only being visible at a
time. That is, one division on the supplementary disc is marked with a cipher, the
other divisions being numbered from such cipher consecutively. The supplementary
disc may, if preferred, be actuated from the unit disc instead of trom the shaft. In
either case, at each complete revolution of the shaft or other revolving part with which
the counter-mechanism is connected; the supplementary disc is rotated to the extent of
one of its divisions.
•
Whenever it is desired to check the accuracy of the figures or sum denoted by the
counter-mechanism, such sum is divided by a check divisor corresponding with the
number of the divisions marked on the supplementary disc (in the present illustration
the check divisor would be 9). The remainder, if any, should, if the sum indicated be
accurate, correspond with the number exposed on the supplementary disc; and, if

page_text: there be no remainder, the cipher should be in view. If the figures do not so agree,
the counter-mechanism is proved to be out of order and incapable of making a proper
record..
This checking device may be applied to any form of counter-mechanism.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we claim :--
1. The improved device for checking counter-imechanism arranged or operating
substantially as set forth.
2. A device for enabling the action of counter-mechanism to be checked or tested
and comprising a supplementary disc (such as O) moved at each revolution to be
recorded a distance corresponding with one of its divisions and so numbered that the
accuracy of the record shewn by the counter-mechanism may be determined by
observing whether, after dividing the number displayed by the counter by the number
of divisions of the supplementary disc, the remainder, if any, corresponds with the
number exposed by the said disc, substantially as herein described.
Dated this 24th day of December 1888.
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C.,
Agent for the Applicants.
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C.,
Agent for the Applicants.