GB594594A - Improvements in or relating to instruments for indicating the ratio or product of two variables - Google Patents
Improvements in or relating to instruments for indicating the ratio or product of two variablesInfo
- Publication number
- GB594594A GB594594A GB656745A GB656745A GB594594A GB 594594 A GB594594 A GB 594594A GB 656745 A GB656745 A GB 656745A GB 656745 A GB656745 A GB 656745A GB 594594 A GB594594 A GB 594594A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capsule
- lever
- diaphragms
- deflection
- indicating
- 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
Links
- 210000000188 Diaphragm Anatomy 0.000 abstract 8
- 239000002775 capsule Substances 0.000 abstract 8
- 230000001419 dependent Effects 0.000 abstract 3
- 230000003068 static Effects 0.000 abstract 3
- 239000012530 fluid Substances 0.000 abstract 2
- 229910052790 beryllium Inorganic materials 0.000 abstract 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium(0) Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 abstract 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 239000010949 copper Substances 0.000 abstract 1
- 230000002093 peripheral Effects 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L15/00—Devices or apparatus for measuring two or more fluid pressure values simultaneously
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid
- G01P5/16—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid using Pitot tubes, e.g. Machmeter
- G01P5/17—Coupling arrangements to the indicating device
- G01P5/175—Coupling arrangements to the indicating device with the determination of Mach number
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
594,594. Pressure gauges; indicating- apparatus. K.D.G. INSTRUMENTS, Ltd., and EVERINGTON. G. D. March 15, 1945, No. 6567. [Classes 106 (ii) and 106 (iv)] An instrument for giving indications dependent on a product or ratio of two variables comprises two resilient diaphragms responsive to fluid pressures varying in accordance with said variables and each having associated therewith means whereby the deflection is proportional to the logarithm of the force due to fluid pressure, a transmission for adding or subtracting the logarithmic deflections of said diaphragms and arranged to move an operating member in sliding engagement with an .edge or track on a pivoted indicating member, which operating member is arranged to move in a plane at an angle to said edge or track and parallel with the pivot axis of the indicating member. An instrument for use in aircraft for indicating the Mach number is shown, the Mach member being a function of the ratio P-S - where P is the pressure developed due to S air velocity and S is the static pressure. Capsules 10 and 11 are evacuated and connected to the pitot head of the aircraft respectively and are surrounded by air at the static pressure, the instrument casing being in communication with the static head. Thus, the inward deflection of the capsule 10 is dependent on S and the outward deflection of the capsule 11 is dependent on P-S. The free diaphragm of the capsule 11 has attached to it a stirrup, having pivotally mounted therein a lever 20 and carrying a screw, the pointed end of which is opposite to a pallet fixed to a spring blade 26 anchored at its other end between two blocks clamped against a frame member. To the frame member is secured a block 30 in which is located a row of adjusting screws which, when suitably adjusted, vary the effective length of the spring 26 in such a manner that the deflection of the diaphragm bears a logarithmic relation to the varying pressure on the diaphragm. The other capsule 10 carries a screw-threaded spindle on which is adjustably mounted a small disc 33, the rim of which engages one end of the lever 20. The end of the spindle is provided with an adjusting nut 37 which engages a second spring blade 36, clamped at its other end and provided with a similar block 41 of adjusting screws in order to obtain a logarithmic response. The lever 20 is arranged to subtract the deflection of the capsule 10 from that of the capsule 11 so that the movement of its upper end is proportional to P-S log -. The upper end of the lever engages S a radial edge of a toothed arcuate member (Fig. 5) which engages with a pinion on the pointer spindle. By suitably dimensioning the toothed arcuate member and the relative position of the upper end of the lever, the pointer may be arranged to indicate Mach numbers from 0.5 to 1.0 over a substantially evenly divided scale. It is preferable to form the diaphragms so that their deflections would be approximately logarithmic without the use of the spring blades and for this purpose, the diaphragms are formed from beryllium copper and have circumferential corrugations. Each capsule is formed from two diaphragms joined together by means of peripheral flanges.
Publications (1)
Publication Number | Publication Date |
---|---|
GB594594A true GB594594A (en) | 1947-11-14 |
Family
ID=1628658
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB656745A Expired GB594594A (en) | 1945-03-15 | Improvements in or relating to instruments for indicating the ratio or product of two variables |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB594594A (en) |
-
1945
- 1945-03-15 GB GB656745A patent/GB594594A/en not_active Expired
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