Annals of Philosophy, Том 6Baldwin, Cradock, and Joy, 1823 |
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Страница 24
... greywacke and perpendicular veins of greenstone , often several miles in length , and not sel- dom twenty or thirty fathoms in width , occur frequently . When the slate is weathered , there remain ridges of steep barren hills , which ...
... greywacke and perpendicular veins of greenstone , often several miles in length , and not sel- dom twenty or thirty fathoms in width , occur frequently . When the slate is weathered , there remain ridges of steep barren hills , which ...
Страница 37
... greywacke . An opinion on this subject ( nearly identical with that which has for many years been my own ) is to be found in the very interesting Cata- logue Mineralogique of the Comte de Bournon : " Les parties composantes qui entrent ...
... greywacke . An opinion on this subject ( nearly identical with that which has for many years been my own ) is to be found in the very interesting Cata- logue Mineralogique of the Comte de Bournon : " Les parties composantes qui entrent ...
Страница 38
... greywacke of North Devon , a circum- stance apparently adverse to the theory which would attribute these singular configurations to the agency of heat ; for we might certainly expect that the killas , which is easily affected by that ...
... greywacke of North Devon , a circum- stance apparently adverse to the theory which would attribute these singular configurations to the agency of heat ; for we might certainly expect that the killas , which is easily affected by that ...
Страница 45
... greywacke slate , by geologists whose authority certainly carries considera- ble weight : but by what rules are we to distinguish primitive from transition slate ? In its structure , the clayslate of Cornwall appears , in general ...
... greywacke slate , by geologists whose authority certainly carries considera- ble weight : but by what rules are we to distinguish primitive from transition slate ? In its structure , the clayslate of Cornwall appears , in general ...
Страница 46
... greywacke ; but I have never seen either copper or tin in greywacke , nor am I aware of any tin veins which intersect it . " VI . Observations on the Submersion of Part of the Mount's Bay , and on the Inundation of Marine Sand on the ...
... greywacke ; but I have never seen either copper or tin in greywacke , nor am I aware of any tin veins which intersect it . " VI . Observations on the Submersion of Part of the Mount's Bay , and on the Inundation of Marine Sand on the ...
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Albumen and salts ammonia angles animal Annals of Philosophy antimony appear ARTICLE atmosphere Aurora barometer barytes beds blood capric acid carbonate charcoal circumstances cleavage coal gas coefficient colour column common considerable contains copper correction crystals degree direction distance distilled earth effect elevation error experiments feet felspar formation globules granite greywacke heat height hydrogen inches instrument iron light lime limestone logarithm magnetic mean measurements mercury metallic method mineral molecules muriatic acid nature nearly needle nitrate observations obtained octahedron oil gas Ordo oscillations oxide oxygen paper parallel phænomena pier planes platina plumbago potash primary form prism produced proportion quantity remarkable respect rhombic dodecahedron rhombic prism right ascension rocks sandstone silver slate solution species specific gravity stars substances sulphuric supposed surface tables temperature thermometer thick tion titanic acid trachyte vapour variation veins vibrations volcano wind
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Страница 314 - It is easily condensed by inverting a glass over the fume as it rises, when it soon renders the glass opaque with a white lining. Although there was a distinct and peculiar odour in the fume, I found that the condensed matter was tasteless, and that it did not effervesce with acids, or affect the test colours for alkalies. Besides as it is produced apparently in greater quantity, when both poles are terminated by plumbago, it seems possible that it is white volatilized carbon, giving origin, by its...
Страница 315 - ... former experiments; they were easily detached from the plumbago by the slightest touch from the point of a knife, and when collected in a white porcelain dish, they rolled about like shot, when the vessel was turned one way and another. To detach any portions of unmelted plumbago which might adhere to them I carefully rubbed them between my thumb and finger in the palm of my hand. I then placed them upon a fragment of wedgewood ware, floated in a dish of mercury, and slid over them a small jar...