﻿Notices respecting New Books. 1059 



yttrium, lanthanum, and cerium are given in detail, about 175 

 lines for Y, 400 for La, and 1700 for Ce. Measurements from a 

 number of Prof. Eder's spectrograms are included in these tables. 

 The second part o£ the paper describes the preparation of rare 

 earth elements in the cerium and yttrium groups. The publication 

 is ready for distribution, and those interested may obtain a copy 

 by addressing a request to the Bureau until the free stock is 

 exhausted. 



The Journal of Scientific Instruments : A monthly publication 

 dealing with their principles, construction and use. Produced 

 by the Institute of Ptiysics with the cooperation of the National 

 Physical Laboratory. Preliminary Number. [Institute of 

 Physics, 10 Essex St., Strand. W.C. 2.J 



This preliminary number of a proposed Journal of Scientific 

 Instruments is due to the recognition of the fact that there is no 

 journal in the English language which covers the ground described 

 in its title. Incidental descriptions of apparatus undoubtedly 

 appear in researches published in other periodicals ; but there is 

 no room in such cases to give more than casual accounts ; and 

 moreover the accounts that are given appeal only to the few that 

 are interested in the main subject of the paper while instruments 

 are usually of value for researches of quite different character 

 from those for which they were originally developed. It is 

 intended in the proposed journal to give measured drawings of 

 instruments as well as a scientific examination of their design. 



This is a sample number and it has been distributed broadcast 

 amongst scientific and industrial people. The possibility of this 

 free distribution was made possible by a grant from the Treasury,, 

 through the Department of Scientific and Industrial Research. 



It is not confined to any one branch of science. There is no 

 department in which instruments are not used. The present 

 number shows that it is intended to cater for them all. Physio- 

 logy, Astronomy, Ordnance Survey, Optics, Aeronautics, Engin- 

 eering, Laboratory Arts, are all represented in the present 

 number. 



The publication of a journal of this kind is a work of national 

 importance. During the war great advances were made in many 

 directions largely due to the scientific aid that was given to makers 

 in the design and construction of instruments intended for novel 

 purposes. This journal will tend to perpetuate such cooperation ; 

 and should serve as a continuous stimulus to the manufacturer. 



The preliminary number can only be succeeded by others if the 

 project receives sufficient promise of support. We are asked by 

 The Institute of Physics to mention that a great many persons 

 who have received a copy of the preliminary number of the pro- 

 posed Journal and who may wish to support it have not yet filled 



