Notices respecting New Boohs. 643 



Manganin. 



Lussana dR/ll= -4-65 . 10~ 7 p + 2-02 . lO" 10 /? 2 - 



Lissell dR/U= + 23 . 10~ 7 ^. 



W.E.W dR/R= +22-2 . 10~ 7 p. 



Lead. 



Lussana dR/R = -197 . 10--> + 47'6 . lO" 10 /. 



Lissell ^R/R=-144.il0- 7 p + 2'4.10- 1 > c2 . 



W.E.W <m/R=-143.10- 7 p. 



/> denotes pressure in atmospheres and a plus sign denotes 

 increase o£ resistance. The term in p 2 - obtained by Lissell 

 is too small to be detected in the present experiments, his 

 experiments having reached to 3000 atmospheres. At 700 

 atmospheres it would only amount to 1 per cent. of the total 

 change. The agreement between my results and those o£ 

 Lissell is therefore as close as could be expected from the 

 accuracy obtainable in these experiments. 



The above experiments were carried out in the Physical 

 Laboratory of the University of Munich under the direction 

 of Professor Rontgen, to whom I desire to express my best 

 thanks for much helpful advice given in the course of the 

 work. 



University College, Bangor, 1907. 



LVI. Notices respecting New Boohs. 



Five-Figure Mathematical Tables for School and Laboratory Pur- 

 poses. By A. du Phe Denning. London : Longmans, Green, 

 & Co. 1906. 



nPHIS is a thin book, quarto size, with 4 pages of logarithms, 

 -*- 6 pages of trigonometrical functions with their logarithms, 

 1 page of squares and 1 page of cubes, and 2 pages of constants and 

 formula. The chief novelty is in the arrangement of the logarithms 

 and antilogarithms. Neither table is complete in the usual way. 

 The antilogarithmic table runs from logarithm '00000 to logarithm 

 •60900, that is up to number 4*0644 ; and the logarithmic table 

 begins with number 4 and goes up to number 9-99. In other 

 words, to keep the differences as small as possible and to economise 

 space, half the table is built on the antilogarithmic plan, and 

 half on the logarithmic plan. The same is true for the log. 

 and antilog. reciprocals. The obvious inconvenience of this 

 method is that, in looking up the logarithms of a series of 

 numbers, the worker will have to be constantly on the alert when 



2X2 



