

Notices 



respecting New Books. 



A 



1st Series. 



2nd Series. 



1st 10. 



2nd 10. 



3rd 10. 



4th 10. 



1st 10. 



2nd 10. 



3rd 10. 



4th 10. 



sees. 



sees. 



sees. 



sees. 



sees. 



sees. 



sees. 



sees. 



56 



5-8 



5-6 



56 



5-6 



6-0 



54 



5-6 



5-6 



5-8 



5-6 



54 



5-8 



56 



55 



5-4 



5-6 



58 



5-6 



53 



5-8 



5-5 



5-8 



56 



55 



5-6 



5-4 



5-6 



5-8 



5-8 



54 



5-4 



6-0 



5-8 



57 



5-4 



55 



5-6 



5-4 



54 



5-8 



54 



5-8 



5-2 



5-6 



5-2 



5-6 



54 



5-8 



5-8 



5-6 



5-2 



60 



56 



5-6 



5-5 



5-6 



6-0 



5-4 



5-4 



5-8 



5-6 



5-7 



5-0 



56 



5-4 



52 



5-8 



56 



5-5 



5-4 



5-8 



5-6 



5-4 



5-68 



56 



6-0 



5-6 



5-8 



52 



5 6 



567 



555 



5'49 



5-71 



562 



5 50 



5-47 



463 



Both the clock and shutter are fastened to a tilting base, 

 so that the paper can be exposed in a position at right angles 

 to the sun's rays at any time during the day. 



In conclusion, it may be pointed out that the present 

 modification has the advantage of portability, and measure- 

 ments can be taken when it is placed in any position. Further, 

 since the shutter moves at a constant rate, the time during 

 which any portion of the slit is open is directly proportional 

 to that occupied in opening the entire slit, whereas in the 

 pendulum apparatus a series of calculations is necessary to 

 determine the length of time during which each millim. of 

 the total length of the slit is open. 



University College, Bristol. 



XL VI I T. Notices respecting New Books. 

 Murbys " Science and Art Department " Seines of Text-Books. 



Practical Solid Geometry : or, Orthographic and Isometric Pro- 

 jection. By J. Payne, late of the School of Science, Charterhouse. 

 To which is added G-raphic Arithmetic and Statics, by J. J. 

 Prince : In accordance with the recent requirements of the 

 Science and Art Department. (London : Murby.) 

 O IISTCE this is at least the fourth edition of Mr. Payne's portion 

 ^ (pp. 1-206) of the volume, it may be presumed to have met the 

 requirements of the examinees of the Science and Art Depart- 

 ment, as also of many " Draughtsmen, Engineers and persons 

 engaged in machine and building construction," satisfactorily. 

 Indeed a glance through it shows that this elementary treatise of 

 Descriptive Greometry has been compiled with painstaking con- 

 scientiousness in the effort to make its matter clear to those classes 

 of students. 



The first fourteen chapters, terminating with the Plane Sections 



