 | Edward Turner - 1835 - 714 Seiten
...apatite and ehlorophane, do not shine until they are gently heated ; and y et if exposed to a red beat, they lose the property so entirely that exposure to...Mr. Pearsall has remarked that in these minerals the phosphoreseenee, destroyed by heat, is restored by eleetrie disehargee ; that speeimens of fluor-spar,... | |
 | Edward Turner - 1837 - 436 Seiten
...sunshine ; and the same effect may be produced by passing electric discharges through the phosphorus. Some phosphori, as apatite and chlorophane, do not...that exposure to solar light does not restore it. Pearsail has remarked that in these minerals the phosphorescence, destroyed by heat, is restored by... | |
 | Edward Turner - 1840 - 696 Seiten
...by passing electric discharges through the phosphorus. Some phosphor!, as apatite and chlorophanc, do not shine until they are gently heated ; and yet...that exposure to solar light does not restore it Mr. Pcarsall has remarked that, in these minerals, the phosphorescence, destroyed by heat, is restored... | |
 | John Johnston - 1843 - 586 Seiten
...the same effect maybe produced by paBsing electric discharges through the phosphorus. Some phosphor!, as apatite and chlorophane, do not shine until they...they lose the property so entirely that exposure to •olar light docs not restore it. It has been remarked that in these minerals the phosphorescence... | |
 | John Johnston - 1846 - 496 Seiten
...sunshine; and the same effect may be produced by passing electric discharges through the phosphorus. Some phosphori, as apatite and chlorophane, do not...property so entirely that exposure to solar light docs not restore it. It has been remarked that in these minerals the phosphorescence destroyed by heat,... | |
 | John Johnston - 1848 - 492 Seiten
...sunshine ; and the same effect may be produced by passing electric discharges through the phosphorus. Some phosphori, as apatite and chlorophane, do not...property so entirely that exposure to solar light docs not restore it. It has been remarked that in these minerals the phosphorescence destroyed by heat,... | |
 | George Brewster - 1850 - 240 Seiten
...sunshine ; and the same effect maybe produced by passing electric discharges through the phosphorus. Some phosphori, as apatite and chlorophane, do not...Mr. Pearsall has remarked that in these minerals the phosphorescence, destroyed by heat, is restored by electric discharges ; that specimens of fluor-spar,... | |
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... produced by passing electric discharges through the phosphorus. Some phosphori, as apatite and chlorophane, do not shine until they are gently heated ; and yet, if exposed to a red heat, they lose the property so entirely, that exposure to solar light... 