iv beli. s\stem technical journal 



October, 1941 



The Reliability of Holding Time Measurements — Roger I. Wilkinson. . 365 



Electrical and Mechanical Analogies — W. P. Mason 405 



The History of Electrical Resonance — Julian Blanchard 415 



A Rapid Visual Test for the Quantitative Determination of Small 

 Concentrations of Calcium in Lead — Earle E. Schumacher and 

 G. M. Bonton 434 



