nd hence the stop- cumference, and that that strain is equal to the force due to say under 12”, then by 4 in. up to 18” or 20”, and after that ping of one or more may cause others near them to stop also. the radius or half diameter.. Take for instance the semicir- by one inch.up to 3 feet, and by… … resents the amount of force exerted upon the arcof 90° which Fia. 18. The Editors are not responsible for the opinions expressed by their Corre- it encloses, and the line B, the direction of the force and (being spondents. of the same length) also its amount. This force, B, will be held Bursting…
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