GB671227A - Improvements in or relating to apparatus for measuring the thickness of layers of non-magnetizable materials on magnetizable materials - Google Patents
Improvements in or relating to apparatus for measuring the thickness of layers of non-magnetizable materials on magnetizable materialsInfo
- Publication number
- GB671227A GB671227A GB2505649A GB2505649A GB671227A GB 671227 A GB671227 A GB 671227A GB 2505649 A GB2505649 A GB 2505649A GB 2505649 A GB2505649 A GB 2505649A GB 671227 A GB671227 A GB 671227A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnet
- attached
- spring
- pointer
- shaft
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
- G01B7/105—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance for measuring thickness of coating
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
671,227. Electric tests and measurements. GENERAL ELECTRIC CO., Ltd., and RUDGE, T. R. Sept. 26; 1950 [Sept. 29, 1949], No. 25056/49. Class 37. A device for determining the thickness of a non-magnetic coating on a magnetic base' comprises a bar-magnet, 8 (Figs. 1 and 2), extended by a contact-making unit 11 of e.g. spherical or conical shape, which when placed on the test surface causes a change in the magnetic field associated with the magnet 8, thereby altering the angular position of a moving iron rotor 14, to which is attached a pointer 45 moving over a scale 46, the longitudinal axis of the bar-magnet 8 being inclined to the test surface. The plastic instrument case 1 is lined with a steel casing 2, having a window 4 to view the pointer 45. The barmagnet 8 is retained in position by a grubscrew 10, and the moving iron element 14, tapered and curved in a spiral, is suspended near the mid-point of the magnet 8 on a shaft 15, which also carries the pointer shaft 36, and is attached to the free end of a planar hair spring 40, the other end of which is attached to a zero adjusting device operated by altering the tension on the spring 40 by the movement of an attached slotted member 62 effected by rotating an external milled wheel 69. A light metal vane 43 is also fixed to the shaft 15 and provides damping for the rotary movement 14. A normally engaging clamping mechanism is released by pressing a spring- loaded push-button 50 projecting through the front of the case 1, and the movement of the pointer shaft 36 is restricted - by two spring stops 59.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2505649A GB671227A (en) | 1949-09-29 | 1949-09-29 | Improvements in or relating to apparatus for measuring the thickness of layers of non-magnetizable materials on magnetizable materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2505649A GB671227A (en) | 1949-09-29 | 1949-09-29 | Improvements in or relating to apparatus for measuring the thickness of layers of non-magnetizable materials on magnetizable materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB671227A true GB671227A (en) | 1952-04-30 |
Family
ID=10221503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2505649A Expired GB671227A (en) | 1949-09-29 | 1949-09-29 | Improvements in or relating to apparatus for measuring the thickness of layers of non-magnetizable materials on magnetizable materials |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB671227A (en) |
-
1949
- 1949-09-29 GB GB2505649A patent/GB671227A/en not_active Expired
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