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1. 发明专利

DE924484C 未知
公开(公告)号：DE924484C
公开(公告)日：1955-03-03
申请号：DEK0006245
申请日：1950-09-08
申请人： KENT-JONES DOUGLAS WILLIAM , ARTHUR JAMES AMOS
发明人： KENT-JONES DOUGLAS WILLIAM , MARTIN WILLIAM
IPC分类号： G01N21/47 , G01N33/10 , H01K1/54
摘要： 581,453. Electric incandescent lamps. PHILIPS LAMPS, Ltd., MARTIN, S. L., and BEVINGTON, C. F. P. June 14, 1944, No. 11370. [Class 39 (ii)] In order to prevent corrosion of the tungsten filament of an electric incandescent lamp when calcium fluoride is incorporated in the getter mixture for the purpose of preventing blackening of the bulb, the calcium fluoride is supplemented by a small quantity of silica or similar refractory oxide such as beryllia, alumina or titania, which is readily attacked by hydrogen fluoride and forms comparatively innocuous compounds which do not corrode the filament. Either synthetic or mineral calcium fluoride may be used and mixed mechanically with not less than 0.2 per cent. by weight of the refractory oxide, the preferred quantity being about 3 per cent. Since synthetic calcium fluoride is liable to absorb water and liberate hydrogen fluoride when the salt is hydrolysed as a result of heating, it is preferably sintered, then treated with concentrated hydrochloric acid and washed with distilled water, after which it is milled with finely ground refractory oxide, e.g., quartz, and then treated with concentrated hydrochloric acid to which a small amount of nitric acid has been added. If mineral calcium fluoride of not less than 98 per cent. purity is employed, the preliminary purification and sintering may, be dispensed with.

2. 发明专利

GB669950A A method and apparatus for measuring the colour of substantially white substances 未知
公开(公告)号：GB669950A
公开(公告)日：1952-04-09
申请号：GB2506249
申请日：1949-09-29
申请人： DOUGLAS WILLIAM KENT JONES , ARTHUR JAMES AMOS
发明人： KENT-JONES DOUGLAS WILLIAM , MARTIN WILLIAM
IPC分类号： G01J3/46
摘要： 669,950. Photo-electric colorimeters. JONES, D. W. KENT-, and AMOS, A. J., (practising as KENT-JONES & A. J. AMOS, D. W.). Aug. 17, 1950 [Sept. 29, 1949], No. 25062/49. Class 40 (iii). [Also in Group XX] A method of measuring the colour (or brightness) of a substantially white substance, and in particular of flour, comprises causing beams of parallel rays of infra-red free light to illuminate both the surface of the substantially white substance and a standard comparative surface and measuring the amount of light reflected by each by means of a pair of photo-electric cells and a current measuring instrument in circuit therewith, a filter being disposed in the system so that the light reaching the photo-electric cells has a wavelength within the range of 500 to 560 mÁ. Light within the stated wavelength range, and preferably of 530 mÁ, is used because the yellowness due to yellow pigments in flour then has least effect and dullness due to bran powder is therefore most accurately measured. The standard substance is preferably heavy magnesium oxide. In one embodiment light from a lamp 1 passes through infra-red filters 18 to lenses 2 and 3 which form two beams of parallel light divided respectively towards glass cells 4 and 5, each of which at the beginning of a test contains the standard substance. Light is reflected from the cells through filters 8 having a main transmission of 530 mÁ light to photo-electric cells 6 and 7 connected with a current measuring instrument in a null indicating circuit. Arranged in front of lens 2 is a shutter 9 operated by a set zero control knob 10. The precise position of the shutter 9 with the knob 10 out is determined by screw adjustment 11 set to make the best use of the scale over the range of samples to be tested. In conducting the test calibrated knob 16 controlling the position of shutter 15 in front of lens 3 by means of cam 17 is set to zero, knob 10 is lifted to render shutter 9 operative, and, with the standard substance in both cells, the set zero knob 14 controlling shutter 12 is adjusted until the current measuring instrument indicates a null. Cell 4 is then changed for a similar cell containing the test sample, knob 10 is depressed to move shutter 9 into the ineffective position and knob 16 adjusted to again obtain a null. The amount calibrated knob 16 has to be rotated represents in arbitrary units the dullness factor of the test sample.

3. 发明专利

GB746074A A method and apparatus for measuring the colour of substantially white substances 未知
公开(公告)号：GB746074A
公开(公告)日：1956-03-07
申请号：GB3113853
申请日：1953-11-10
申请人： DOUGLAS WILLIAM KENT JONES , ARTHUR JAMES AMOS
发明人： KENT-JONES DOUGLAS WILLIAM , MARTIN WILLIAM , SCOTT ROBERT ARTHUR
IPC分类号： G01N21/47
摘要： 746,074. Measuring whiteness photo-electrically. JONES, D. W. KENT-, and AMOS, A. J. Aug. 13, 1954 [Nov. 10, 1953], No. 31138/53. Class 40 (3). The whiteness of a substance 1 such as a flour paste is determined by means of two beams of light, 5, 9, produced by a source 2 and from which firstly the infra-red content is removed by means of filters 3, 4 and subsequently all other wavelengths than the 500-560 millimicron range by filters 7, 14. Beam 5 passes through a ground glass plate and the filter 7 to a photo-cell 6. The other beam 9 illuminates uniformly the surface 11 under examination and the light reflected from this surface is focused by a lens system 12 on to a photo-cell 13 through the 500-560 millimicron filter 14. Each cell is provided with an adjustable shutter; 8 for cell 6, and 16 for cell 13. The cells are connected in a null circuit with a galvanometer and tapping key. In use a standard comparative surface is mounted in holder 11 which may run in guides, and shutter 9 is so adjusted that a scale associated with it indicates the colour grade value characteristic of the shutter. Shutter 8 is then adjusted so that the galvanometer gives a null reading when the tapping key is closed. The comparative surface is then replaced by the surface under test and shutter 6 adjusted to produce a zero reading in the galvanometer. The position of the shutter is then a direct indication of the colour of the substance under test. Specification 669,950 is referred to.

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