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" The word speculum is used to describe a reflector which is metallic, such as those made of silver, steel, or of grain tin mixed with copper. (10.) Specula or mirrors are either plane, concave, or convex. A plane speculum is one which is perfectly flat,... "
A Treatise on Optics - Página 13
por David Brewster - 1841 - 418 páginas
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A Treatise on Optics

David Brewster - 1831 - 412 páginas
...a concave speculum is one which is hollow like the inside of a watch-glass ; and a convex tpeculum is one which is round like the outside of a watch-glass....light which falls upon glass mirrors is intercepted by tlae glass before it is reflected from the quicksilvered surface, we shall suppose all our mirrors...
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An Introduction to Natural Philosophy: Designed as a Text Book ..., Volumen2

Denison Olmsted - 1832 - 378 páginas
...made of silver, steel, tin, or a peculiar alloy called speculum metal. As the light which falls on glass mirrors, is intercepted by the glass before it is reflected from the quicksilvered surface, a speculum, or a reflector of polished metal, is that supposed to be employed in optical experiments,...
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A Treatise on Optics

David Brewster, Alexander Dallas Bache - 1833 - 674 páginas
...formation of images from objects placed before such surfaces. CHAP. I. REFLEXION BY SPECULA AND MIRRORS. (9.) ANY substance of a regular form employed for...all optical instruments. (11.) When a ray of light, AD,fig. 1., falls upon a plane speculum, MN, at the point D, it will be reflected or driven back in...
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Pneumatics, electricity, magnetism, and optics

Denison Olmsted - 1835 - 374 páginas
...made of silver, steel, tin, or of a peculiar alloy called speculum metal. As the light which falls on glass mirrors, is intercepted by the glass before it is reflected from the quicksilvered surface, a speculum, or a reflector of polished metal, is that supposed to be employed in optical experments,...
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Treatise on Optics

David Brewster - 1837 - 432 páginas
...The word speculum is used to describe a reflector which is metallic, such as those made of sliver, steel, or of grain tin mixed with copper. (10.) Specula...all optical instruments. (11.) When a ray of light, A T>,fig. 1., falls upon a plane — . j speculum, MN, at the point D, it will be reflected or driven...
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A Compendium of Natural Philosophy: Adapted to the Use of the General Reader ...

Denison Olmsted - 1837 - 374 páginas
...made of silver, steel, tin, or a peculiar alloy called speculum metal. As the light which falls on glass mirrors is intercepted by the glass before it is reflected from the quicksilvered surface, a speculum, or a reflector of polished metal, is that supposed to be employed in optical experiments,...
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A Treatise on Optics

Sir David Brewster - 1838 - 432 páginas
...plane, concave, or convex. A plane speculum is one which is perfectly flat, like a lookrag-glass ; a concave speculum is one which is hollow like the...all optical instruments. (11.) When a ray of light, AD,fig. 1., falls upon a plane speculum, MN, at the point D, it will be reflected or driven back in...
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The British Cyclopaedia of the Arts, Sciences, History, Geography ...

Charles Frederick Partington - 1838 - 1116 páginas
...looking-glass ; a concave speculum is one which s hollow, like the inside of a watch-glass ; and a cornier speculum is one which is round, like the outside of...metal, as they are in almost all optical instruments. The image of any object is a picture of it formed either in the air, or n the bottom of the eye, or...
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A Treatise on Optics

David Brewster - 1844 - 464 páginas
...speculum is one which is hollow like the inside of a watch-glass ; and a convex speculum is one whicn is round like the outside of a watch-glass. As the...it is reflected from the quick-silvered surface, we biiall suppose all our mirrors to be formed of polished metal, as they are in almost all optical instruments....
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A Treatise on Optics

David Brewster - 1845 - 436 páginas
...speculum is one which is hollow like the inside of a watch-glass ; and a convex speculum is one whicn is round like the outside of a watch-glass. As the...all optical instruments. (11.) When a ray of light, AT),fig. 1., falls upon a plane speculum, MN, at the point D, it wifbe reflected or driven back in...
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