Symons's Monthly Meteorological Magazine, Volumes 11-12Edward Stanford, 1876 - Meteorology |
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Popular passages
Page 120 - We might even place a layer of asphalt between the copper floor and the ground, so as to insulate the building. If the mill were then struck with lightning, it would remain charged for some time, and a person standing on the ground outside and touching the wall might receive a shock, but no electrical effect would be perceived inside, even on the most delicate electrometer.
Page 119 - WM. THOMSON explained the relation of the clouds and their movements, and that it was not essential to the formation of a mackerel sky that there should be two different temperatures. All that was essential was that portions of air should be moving up and down ; and further, that the up and down motion should seem as though it resulted from the slipping of one stratum of air upon another and the production thereby of waves ; and the second essential was that one or other of the two portions of air...
Page 120 - ... be smaller than those which would have occurred without the conductor. It is probable, also, that fewer discharges will occur in the region surrounding the conductor. It appears to me that these arrangements are calculated rather for the benefit of the surrounding country, and for the relief of clouds labouring under an accumulation of electricity, than for the protection of the building on which the conductor is erected.
Page 116 - Ireland, showed that the gauges started at the cost of the Association had been supplemented by many others established at the cost of private individuals, and gave a map showing the present complete distribution of stations. Almost all the observers have proved good ones, and, as the table shows, the returns have been forwarded with regularity. The period is too short to yield precise results, but a good system has been inaugurated and is in full operation. At the commencement of this report it...
Page 83 - Contributions to Meteorology : being Results derived from an examination of the Observations of the United States Signal Service, and from other sources.
Page 86 - The fluid used is glycerine, in a maximum state of purity, which has a specific gravity of 1 '26, or about one tenth that of mercury. It has the advantage of giving a vapour of very low tension in the Torricellian vacuum from its high boiling point, and is therefore free from the masking effect of back pressure which interferes with the indications of a water barometer. The fluctuations of the column are observed in a glass tube of 1 inch sectional area, or 100th that of the cistern. The tube forming...
Page 72 - ... upright glass tube dipping into a glass cistern of mercury, so contrived that an up and down movement, by means of a screw, can be imparted to it. Through the top of the tube a piece of platinum wire is passed and hermetically sealed. The cistern also has a metallic connection, so that by means of copper wires in the back of the frame a galvanic circuit is established ; another connection also exists by means of a metallic point dipping into the cistern. The circuit, however, can be cut off from...
Page 120 - BWG (0.238 inch diameter), were carried round the foundation of the house, up each of the corners and gables and along the ridges, this would probably be a sufficient protection for an ordinary building against any thunder-storm in this climate. The copper wire may be built into the wall to prevent theft, but...
Page 36 - The most rough and ready way that has been employed for ascertaining whether or not a water is polluted with organic matter is to partly fill a clean bottle with a sample of it, and then having violently shaken the same, to take a hearty sniff of the air of the bottle which has been agitated with the water. If the air smells sweet and fresh the absence of an injurious amount of organic matter is inferred and vice verm.
Page 119 - ... limits of half a year each way. " 2. The next feature in magnitude and certainty is, that the periods of minimum temperature, or cold, are not either in, or anywhere near, the middle time between the crests of those three chronologically identified heat-waves, but are comparatively close up to them on either side, at a distance of about a year and a half, so that the next such cold wave is due at the end of the present year. "This is, perhaps, not an agreeable prospect, especially if political...