ADVERTISEMENTS. 



THE " MECHANICAL ENGINEER" 



Pocket Calculator. 



Cbe engineer's Cime Sauen 



Invaluable to ENGINEERS, 



DRAUGHTSMEN, STUDENTS, 

 AND ALL WHO HAVE CALCULATIONS TO MAKE. 



PRICE, 



In Handsome 



Nickel Cases, 

 With Full 



Instructions, 

 Same Size as 



Illustration, 



7/Q Post Free 

 /* United Kingdom. 



91 Post Free 



/ anywhere abroad. 



Large Size 



(2\in. dial], 



40 A P..st Fr.- t . 

 1C W I'nit.-,! 



I'o-it FI,T 



anywhere abroad 



Accurate and 

 Reliable 

 Instrument. 



It is only 



necessary to turn 



two nuts, the 



instrument does 



the rest. 



|P 



Saves no end 



of 

 time and ivorry. 



READ WHAT USERS SAY: 



PROF. JOHN GOODMAN, YORKSHIRE COLLEGE, Assoc.M.Inst.C.E., M.I.Mech.E., says: 



" I like the Calculators very much. I consider them a marvel of cheapness, and I 

 hope you will get a very big sale for them." 



WILFRED J. LINEHAM, M.Iiist.C.E., M.I.Mech.E., HEAD OF THE ENGINEERING 

 DEPARTMENT OF THE GOLDSMITHS' INSTITUTE, remarks: 



"The Mechanical Calculator is a decided boon to the draughtsman and the 

 engineering teacher. A child could understand it, and I have no doubt you will have 

 a tremendous sale." 



PROF. W.W. F. PcLLEN.Assoc.M.Inst.c.K., M.I.Mech.E. , SocTH-WESTEKN POLYTECHNIC, says: 



" I cannot speak too highly of the Pocket Calculator. Its great advantage over a 



slide rule is that it can be carried in the pocket without inconvenience. The figures 



are always clean, while the accuracy obtained with it is equal to that with a lOin. 



slide rule. In my opinion it is the most useful instrument an engineer can possess." 



SEND FOR DESCRIPTIVE CIRCULAR-FREE. 



THE SCIENTIFIC PUBLISHING CO., 



53, New Bailey Street, Manchester, England. 



