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THE 
CAN ADIAN J OURNAL 
OF 
INDUSTRY, SCIENCE, AND ART: 
CONDUCTED BY 
THE EDITING COMMITTEE OF THE CANADIAN INSTITUTE. 
New SEriezs. 
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RR AA RADAR AAA AAR ARARA ARAL AAA AAA ge ale aga ig) SS SE fa Sa Sn Vig eg Or 
MAY 29 1940 
MAY, Leco. 
¥' 
- TORONTO: 
fogs FOR THE CANADIAN INSTITUTE, 
BY ae AND GIBSON, YONGE STREET. 
7S, 
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NES a 
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