Memoirs of the Literary and Philosophical Society of ManchesterThe Society, 1868 |
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Page 293 - The total rise of its freezing-point has been only '6 of a degree ; but this is probably owing to the time which elapsed between its construction and the first observation being rather greater than in the case of the other thermometer. The rise of the two thermometers has been almost identical during the last nineteen years.
Page 294 - ... the microscope. I shall confine my remarks more especially to these globular bodies. Some of these are as perfect in form as the most carefully turned billiard balls, and have a brilliant polish. The various colours which these globules exhibit give additional interest to their examination. Some are transparent crystal spheres, others are opaque white, many are yellow and brown, and variegated like polished agates or carnelian of different shades. The most abundant of the highly polished balls...
Page 292 - I think the results may offer some interest to the Society. Both thermometers are graduated on the stem, and are, I believe, the first in this country which were accurately calibrated. Thirteen divisions of one of them correspond to one degree Fahrenheit. It was made by Mr. Dancer, in the winter of 1843-44. My first observation of its freezing-point was made in April 1 844.
Page 294 - ... substances, some particles transparent, others white and red. It contains also a number of curious-looking objects, which vary considerably in size and colour ; the majority of these bodies are spherical, and when separated from the irregularly shaped particles forming the bulk of the dust, they become interesting objects for the microscope. I shall confine my remarks more especially to these globular bodies. Some of these are as perfect in form as the most carefully turned billiard-balls, and...
Page 69 - ... example, there is any difference as to expansion with temperature of the same wire when lightly and when heavily loaded, a cause of disturbance would be introduced which it would be excessively difficult to allow for. It seemed therefore absolutely essential to make direct experiments on this point. The object of the present communication is to give an account of some experiments of this kind. A preliminary account of these experiments was communicated to the British Association at the Manchester...
Page 294 - ... of different shades. The most abundant of the highly polished balls are black ; there are others which look like rusty cannon balls — some of these have an aperture in them like a bombshell, and many are perforated in all directions. To obtain these objects the dust should be washed in a bowl and all the lightest particles allowed to float away ; the remainder consists of fragmentary crystalline and ferruginous substances ; mixed with these are the polished balls described, which, under the...
Page 50 - When people speak of good ventilation, they mean, without knowing it, air with less than -07 per cent of carbonic acid. We must not conclude that because the quantity of carbonic acid is small, the effect is small; the conclusion is rather that minute changes in the amount of this acid are indications of occurrences of the highest importance.
Page 292 - Vol. in. 1868, pp. 291, 292.] SEVEN years ago an apparatus was constructed for the natural philosophy class of the University of Glasgow for illustrating the induction of electric currents by the motion of a conductor across the lines of terrestrial magnetic force. This instrument consisted of a large circular coil of many turns of fine copper wire, made to rotate by wheelwork about an axis, which can be set to positions inclined at all angles to the vertical. A fixed circle, parallel to the plane...
Page 295 - ... allowed to float away ; the remainder consists of fragmentary crystalline and ferruginous substances ; mixed with these are the polished balls described, which, under the microscope, by a brilliant reflected light, look like little gems. To separate the spherical bodies from the irregular ones, it is only necessary to sprinkle some of this material on an inclined glass plate, and by gentle vibration the balls roll down, and can thus be collected. Having satisfied ourselves with the examination...
Page 35 - Memoirs of the Literary and Philosophical Society of Manchester,