Some experiments with a new fog-signal have been recently made at Coinba, near Ipswich, England. It is a detonating rocket with half a pound of gun cotton at its base, and the experiments as .to. the distance at which the report could be heard showed that a half pound of "gun-cotton when detonated at an elevation of 900 yards, could be heard ten miles, against two and a half miles when fired on the sea level. . When the rockets reached a height of about 950 yards they gracefully curved over, burst, and a. deafening report was heard, which somewhat resembled the discharge of a heavy piece of ordnance, and then rolling away on all sides, reverberating from hill to hill, and across the valleys after the manner of a heavy peal of thunder. —Exchange.
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Akaroa Mail and Banks Peninsula Advertiser, Volume 2, Issue 105, 20 July 1877, Page 3
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134Untitled Akaroa Mail and Banks Peninsula Advertiser, Volume 2, Issue 105, 20 July 1877, Page 3
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