US613190A - Frank cossor - Google Patents
Frank cossor Download PDFInfo
- Publication number
- US613190A US613190A US613190DA US613190A US 613190 A US613190 A US 613190A US 613190D A US613190D A US 613190DA US 613190 A US613190 A US 613190A
- Authority
- US
- United States
- Prior art keywords
- bulb
- mercury
- bore
- tube
- column
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 40
- 229910052753 mercury Inorganic materials 0.000 description 40
- 230000000694 effects Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 230000000452 restraining Effects 0.000 description 2
- 230000000717 retained Effects 0.000 description 2
- 230000000630 rising Effects 0.000 description 2
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K5/00—Measuring temperature based on the expansion or contraction of a material
- G01K5/02—Measuring temperature based on the expansion or contraction of a material the material being a liquid
- G01K5/22—Measuring temperature based on the expansion or contraction of a material the material being a liquid with provision for expansion indicating over not more than a few degrees
- G01K5/225—Measuring temperature based on the expansion or contraction of a material the material being a liquid with provision for expansion indicating over not more than a few degrees with means for indicating a maximum, e.g. a constriction in the capillary tube
Definitions
- FRANK COSSOR OF LONDON, ENGLAND, ASSIGNOR TO S. MAW, SON, da THOMPSON, OF SAME PLACE.
- This invention has for its object improvements in clinical thermometers, whereby while the indestructible index is obtained as now usual thev column of mercury in the indicator-tube can be readily shaken down below the scale with the application of very slight force.
- the best way of effecting this is to make the portion of the tube which is next to the bulb of larger bore than the remainder of the tube and to form the constriction in this larger portion of the bore.
- A is a piece of ordinary glass tube with a tine bore, such as used in ordinary clinical thermometers.
- B is a length of dint-glass tube of larger bore (preferably a attened bore) joined at one end to the end of A.
- C is a bulb containing mercury joined to the other end of B.
- D is a short sudden constriction formed in the bore of the tube B near to the bulb and adapted, as now usual in registering thermometers, for restraining all mercury which is forced past it when the bulb is heated, from passing back to the bulb when the bulb cools down.
- the object of forming the length of tube B with a flattened bore is to allow of the constriction D being more readily formed than in the ordinary clinical thermometer.
- thermometers in which the column of mercury after rising from the bulb when-the bulb is heated is always free to pass back to the bulb on the bulb being cooled and in which a small portion of the column of mercury is separated from the remaining portion by a small air-speck, which short or index length of the column of mercury is left behind in the indicator-tube when the bulb cools and remains, indicating the temperature to which the thermometer was heated, it
- a clinical thermometer having between the bulb and the fine bore of the indicatortube, a length of tube of larger bore than that of the indicatontube and which has in it a sharp sudden constriction adapted to break the column of lnercury when the bulb cools, and stop all mercury from passing back from the indicator-tube to the bulb.
- a clinical lthermometer having between the sharp constriction and the Ine bore of the indicator-tube an enlargement of this line bore, capable of containing a comparatively FRANK COSSOR.l
Description
8. 0u 5. 2 A. c o d e t n e t a DI (No Model.)
fywerz:
UNITED STATES PATENT OFFICE.
FRANK COSSOR, OF LONDON, ENGLAND, ASSIGNOR TO S. MAW, SON, da THOMPSON, OF SAME PLACE.
CLINICAL THERMOMETER.
SPECIFICATION forming part of Letters Patent N0. 613,190, dated October 25, 1898.
Application led February 21, 1898. Serial No. 671,141. (No model.)
T0 all whom t may concern.:
Be it known that I, FRANK COSSOR, meteorological glass-blower, a subject of the Queen of Great Britain, residing at l5 Clerkenwell Green, London, England, have invented certain new and useful Improvements in Clinical Thermometers, of which the following is a specification.
This invention has for its object improvements in clinical thermometers, whereby while the indestructible index is obtained as now usual thev column of mercury in the indicator-tube can be readily shaken down below the scale with the application of very slight force. For this purpose I form between the fine-bore indicator portion of the thermometer-tube and the ordinary sharp, sudden constriction by which the indestructible index is obtained an enlargement of the fine bore capable of containing a comparatively considerable weight of mercury. The best way of effecting this is to make the portion of the tube which is next to the bulb of larger bore than the remainder of the tube and to form the constriction in this larger portion of the bore.
The drawing annexed shows, on an enlarged scale, a longitudinal section of a clinical ther` mometer constructed in the above manner.
A is a piece of ordinary glass tube with a tine bore, such as used in ordinary clinical thermometers.
B is a length of dint-glass tube of larger bore (preferably a attened bore) joined at one end to the end of A.
C is a bulb containing mercury joined to the other end of B.
D is a short sudden constriction formed in the bore of the tube B near to the bulb and adapted, as now usual in registering thermometers, for restraining all mercury which is forced past it when the bulb is heated, from passing back to the bulb when the bulb cools down.
The object of forming the length of tube B with a flattened bore is to allow of the constriction D being more readily formed than in the ordinary clinical thermometer.
When a clinical thermometer formed in the above way is used, mercury iiows from the bulb past the constriction and into the indicator-tube in one unbroken column as the bulb becomes heated, and when the mercury has risen to the temperature of a patient and the indestructible index has been formedV by means of the constriction the instrument, whenpit has been allowed to cool, requires only a very slight swing to cause the return of the column of mercury from the indicatortube, the momentum imparted by the slight swing to the comparatively large body of mercury within the enlarged portion of the bore causing a large flow of mercury past the constriction and into the bulb, and thereby allowing the column of mercury to pass back freely from the indicator-tube.
I would state that I am aware that in that class of thermometers in which the column of mercury after rising from the bulb when-the bulb is heated is always free to pass back to the bulb on the bulb being cooled and in which a small portion of the column of mercury is separated from the remaining portion by a small air-speck, which short or index length of the column of mercury is left behind in the indicator-tube when the bulb cools and remains, indicating the temperature to which the thermometer was heated, it
'has before been proposed to form an enlargement of the bore near to the bulb, so that the short or index length of the column of mercury when shaken down into this enlarged 'portion of the bore may be retained therein and hindered from joining the main body of mercury in the bulb, and also that it has been proposed to form a contraction between the bulb and the enlarged portion of the bore to assist in retaining this short or index length of mercury from entering the bulb. I am also aware that ordinary clinical thermometers when they have been badly made, so that the column of mercury rises too high in the tube for allowing of the required range of temperature being registered, an extremely small enlargement of the bore has been made near to the constriction of the bore, so as to reduce the height to which the column of mercury rises in the tube for any given temperature; but such small enlargement would practically have no effect in enabling the column of mercury to be more readily shaken back from the tube and would not effect the object of my invention.
l. A clinical thermometer having between the bulb and the fine bore of the indicatortube, a length of tube of larger bore than that of the indicatontube and which has in it a sharp sudden constriction adapted to break the column of lnercury when the bulb cools, and stop all mercury from passing back from the indicator-tube to the bulb.
2. A clinical lthermometer having between the sharp constriction and the Ine bore of the indicator-tube an enlargement of this line bore, capable of containing a comparatively FRANK COSSOR.l
litnessesz EDWARD W. IsPPoLET, E. SHAW.
Publications (1)
Publication Number | Publication Date |
---|---|
US613190A true US613190A (en) | 1898-10-25 |
Family
ID=2681801
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US613190D Expired - Lifetime US613190A (en) | Frank cossor |
Country Status (1)
Country | Link |
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US (1) | US613190A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2447888A (en) * | 1944-09-07 | 1948-08-24 | Taylor Instrument Co | Thermometer |
US2457455A (en) * | 1944-05-04 | 1948-12-28 | Eisele Logan | Clinical thermometer |
-
0
- US US613190D patent/US613190A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2457455A (en) * | 1944-05-04 | 1948-12-28 | Eisele Logan | Clinical thermometer |
US2447888A (en) * | 1944-09-07 | 1948-08-24 | Taylor Instrument Co | Thermometer |
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