Pickworth, Charles N. <br/><br/>
The slide rule  : a practical manual 
/by Charles N.Pickworth 
 - 18th ed. 
 - Manchester  Emmott  1927 
 - 134 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematical instruments-Calculations
<br/><br/><label>Dewey Class. No.: </label>570.78  / PIC