Abstract
THE direct influence of changes of atmospheric pressure on the occurrence of many of our colliery accidents, so clearly demonstrated by the investigations of Messrs. Scott and Galloway, has naturally led to the consideration of barometers affording a wide range of movement, thereby rendering small atmospheric changes at once apparent, and clearly noticeable to the uneducated eyes of those engaged in such situations as collieries, storm stations, and other places where it is important fo note rapid movements without the careful observation which is requisite for the correct reading of an ordinary mercurial barometer.
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