A pneumometer / [Richard Howson].

  • Howson, Richard.
Date:
1888
Catalogue details

Licence: Public Domain Mark

Credit: A pneumometer / [Richard Howson]. Source: Wellcome Collection.

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    Date of Application, 10th Sept., 1887 Complete Specification Left, 5th June, 1888 Complete Specification Accepted, lith Aug., 1888 * A.D. 1887, 10th September. N° 12,273. PROVISIONAL SPECIFICATION. A Pneumometer. We, Richard Howson of Southfield Terrace, Middlesbrough on Tees in the County of York, Engineer, and Edward Crowe of Grove Hill, Middlesbrough aforesaid, Engineer, do hereby declare the nature of this invention to bo as follows :— 5 It consists of an apparatus for testing the strength of the lungs by means of a pressure gauge with which a pipe with a mouthpiece is connected. So iar the construction is of an ordinary and well known character, but it is combined with a mechanism which is new, & which forms the essential of our invention, namely that the gauge will not indicate the pressure except on the introduction oi a coin into a 10 slot or receptacle prepared for it. The manner in which the coin acts is as follows. The blow pipe, or mouthpiece is connected with a small cylinder in wrhich a piston works. Betore the coin is introduced, the piston rests on a seat, closing the inlet orifice, & is held there by means ol a catch attached to a rocking lever counterweighted at one end. In this condition it is 15 impossible for the air blown into the mouthpiece to act on the gauge. On the other hand, when the coin is introduced, it falls onto the opposite end ot the lever, Si overbalances the counterweight, by which means the catch is released, the piston rises & allows the air to pass into the gauge, which then indicates the pressure. 20 In the mean time the coin has to be removed from the end of the lever in order that the apparatus may resume its original position, & this is eilected as follows. . ... . When the coin is introduced it rests in the first instance on a shelving plate attached to the lever, but it cannot fall any further because its edge comes in contact 25 with a projecting stop. This stop forms part of another lever which is arranged »o that when the piston moves upward, it acts upon that lever & causes the stop to be removed. The coin then falls off the plate. Thus when the operator ceases blowing the piston drops, the counterweight forces the catch again into its place, & the passage to the gauge is locked until a new coin is introduced. 30 Dated this 9th day of September 1887. [Price 8<L] RICHARD HOWSON. EDWARD CROWE.
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