II 



ADVERTISEMENTS. 



The " Mechanical Engineer " 



POCKET CALCULATOR. 



THE ENGINEER'S TIME SAVER. 



Invaluable to ENGINEERS, 



DRAUGHTSMEN, STUDENTS, 



And all who have Calculations to make. 



PRICE: 



In Handsome 



Nickel Cases, 

 With Full 



Instructions, 

 Same Size as 



Illustration, 



Post Free, 

 iteil Kindlon). 



7/9 DB 



91 Post Free, 



/ " anywhere ;il>ni 1. 



Large Size 



(2hin. dial), 



1 O Q l'"st Free, 

 Ifi/Vtfattod Kiiu;iriii 



15/ >''t Free, 



An Accurate and 



Reliable 

 Instrument. 



It is only 



necessary to turn 



two nuts, the 



instrument does 



the rest. 



Saves no ena 



of 

 time and ivorry. 



READ WHAT USERS SAY: 



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



' 1 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. LINKHAM, M.Inst.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. PULLEN, A.M.Inst.C.E., M.I.Mech.E., SOUTH-WESTERN POLYTECHNIC, says-' 



"1 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. 



Cbe Scientific publigbinp Co., 



