Transactions of The Optical Society最新文献

The general form of the Smith-Helmholtz equation 史密斯-亥姆霍兹方程的一般形式

Transactions of The Optical Society Pub Date : 1930-06-01 DOI: 10.1088/1475-4878/31/5/301

T. Smith

{"title":"The general form of the Smith-Helmholtz equation","authors":"T. Smith","doi":"10.1088/1475-4878/31/5/301","DOIUrl":"https://doi.org/10.1088/1475-4878/31/5/301","url":null,"abstract":"The Smith-Helmholtz equation μ sin θy = μ' sin θ'y' is only applicable to infinitesimal objects and images. When both field and aperture are large, in addition to the ordinary equation involving lengths measured along a ray, there are three exact equations of the type xx' a + μ'L'x'b - μLxc - μLμ'L'd = 0, bc - ad = I, all expressing the same correspondence. This correspondence is primarily geometrical rather than optical. The coefficient a in all these equations is the secondary power of the system for the ray considered. When the instrument is axially symmetrical the coefficients in two of the equations have the values b = c = I, d = 0. The third equation can be made to take the same form by moving the origins to suitable points on the axis of the instrument. The equations are considered in their application to asymmetrical instruments. In telescopic systems axial symmetry is, in general, necessary for the Smith-Helmholtz equality to be applicable. From the general equations a great variety of formulae for computing conjugate points can be obtained. Equations of the same one-one class can be found for other projective relations, but, in general, they are less useful than the corrected Smith-Helmholtz equations, because when the linear and angular variables are associated as desired the positions of the origins must be computed instead of being recognisable by inspection.","PeriodicalId":405858,"journal":{"name":"Transactions of The Optical Society","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1930-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115171559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

A chromatic method of making optical settings 一种制作光学设置的彩色方法

Transactions of The Optical Society Pub Date : 1930-06-01 DOI: 10.1088/1475-4878/31/5/302

D. S. Perfect

引用次数: 0

A description of the three prism spectro-graph for the royal observatory, Edinburgh 爱丁堡皇家天文台三棱镜光谱仪的描述

Transactions of The Optical Society Pub Date : 1930-05-01 DOI: 10.1088/1475-4878/31/4/305

J. H. Dowell

引用次数: 1

A re-determination of the mixture curves of the spectrum 光谱混合曲线的再测定

Transactions of The Optical Society Pub Date : 1930-05-01 DOI: 10.1088/1475-4878/31/4/303

W. D. Wright

引用次数: 52

A description of the 36-inch aperture telescope for the royal observatory, Edinburgh 爱丁堡皇家天文台36英寸口径望远镜的说明

Transactions of The Optical Society Pub Date : 1930-05-01 DOI: 10.1088/1475-4878/31/4/306

C. Young

引用次数: 0

The purpose and design of the new equipment at the royal observatory, Edinburgh 爱丁堡皇家天文台新设备的用途和设计

Transactions of The Optical Society Pub Date : 1930-05-01 DOI: 10.1088/1475-4878/31/4/304

R. A. Sampson

{"title":"The purpose and design of the new equipment at the royal observatory, Edinburgh","authors":"R. A. Sampson","doi":"10.1088/1475-4878/31/4/304","DOIUrl":"https://doi.org/10.1088/1475-4878/31/4/304","url":null,"abstract":"The author deals with the reasons which determined the form of the telescope - a Cassegrain reflector of 36 inches aperture and 54 feet focal length, serving a spectrograph of one, two or three prisms - and indicates the problems to which it is intended to apply it. These are, generally, the intensity of stellar light for different parts of the spectrum. It is pointed out that even an empiric treatment of this question led Adams to a method that had doubled our knowledge of stellar distances. A theoretical treatment, comprising a discussion of the behaviour of the photographic plate, led to fixing the temperature sequence. A slit spectrograph is required in order to deal with the lines. The state of the lines, combined with that of the continuous spectrum, conveys all the information that reaches us of the star's constitution and atmosphere. Subsidiary but highly interesting questions are those of selective absorption of light by the atmosphere of the earth. Behind these are the theoretical and laboratory investigations of the relation between intensity of light and the density of silver deposit on the photographic plate. The whole presents an attractive field.","PeriodicalId":405858,"journal":{"name":"Transactions of The Optical Society","volume":"38 17","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1930-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120927575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The lustre of textile fibres and a method of measurement 纺织纤维的光泽及其测量方法

Transactions of The Optical Society Pub Date : 1930-05-01 DOI: 10.1088/1475-4878/31/4/302

M. Pelton

引用次数: 8

Optics in Radio Transmission and other fresh fields 无线电传输光学等新领域

Transactions of The Optical Society Pub Date : 1930-02-01 DOI: 10.1088/1475-4878/31/3/301

F. Twyman

引用次数: 2

Exhibit of a new system of test type illumination 展示一种新型试验式照明系统

Transactions of The Optical Society Pub Date : 1930-02-01 DOI: 10.1088/1475-4878/31/3/304

Messrs Raphael's Ltd.

引用次数: 0

Exhibit of scientype occluding glasses 科学型遮挡眼镜展示

Transactions of The Optical Society Pub Date : 1930-02-01 DOI: 10.1088/1475-4878/31/3/305

Messrs Raphael's Ltd.

引用次数: 0