Portland cement must be so fine that more than threes-fourths of it will pass through a sieve of 40,000 holes pel square inch—a sieve so fine that it holds water.
Small cannon, firing explosive shells, are to be carried on a new type, ot fighting aeroplane instead of machineSuns, ii tests under way prove supcessful.
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Bibliographic details
Ashburton Guardian, Volume 48, Issue 252, 3 August 1928, Page 2
Word Count
55Untitled Ashburton Guardian, Volume 48, Issue 252, 3 August 1928, Page 2
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