Encyclopædia Britannica: Or, A Dictionary of Arts, Sciences, and Miscellaneous Literature, 2. köide,2. osaColin Macfarquhar, George Gleig A. Bell and C. Macfarquhar, 1797 |
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Page 590
... telescope is thus adjutted , a closely embracing the iteel spindle at about a third part mark must be set at a considerable distance ( the great- of its length from the top ; by the means of a small er the better ) in the horizontal ...
... telescope is thus adjutted , a closely embracing the iteel spindle at about a third part mark must be set at a considerable distance ( the great- of its length from the top ; by the means of a small er the better ) in the horizontal ...
Page 589
... telescope upon the limb , will be fufficiently true , or free from conical curvity ; which may be exa- mined by fufpending a long plumb - line at a convenient distance from the inftrument ; and by fixing the plane of the fector in a ...
... telescope upon the limb , will be fufficiently true , or free from conical curvity ; which may be exa- mined by fufpending a long plumb - line at a convenient distance from the inftrument ; and by fixing the plane of the fector in a ...
Page 590
... telescope is thus adjufted , a mark must be fet at a confiderable diftance ( the great- er the better ) in the horizontal direction of the inter- fection of the crofs wires , and in a place where it can be illuminated in the night ...
... telescope is thus adjufted , a mark must be fet at a confiderable diftance ( the great- er the better ) in the horizontal direction of the inter- fection of the crofs wires , and in a place where it can be illuminated in the night ...
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Common terms and phrases
aftronomers againſt alfo alſo ancient angle appear Athenians Athens atmoſphere Attica aurora borealis axis becauſe body cafe called caufe cauſe centre circle comet confequently confiderable confifts defcribed degrees difcovered difk diftance diurnal motion earth eclipfe equal equator faid fame fatellites fays fecond feems feen fent feven feveral fhadow fhall fhip fhould fhows fide figns fince firft fituation fixed ftars fmall folar fome fometimes foon fouth fpots ftars ftate ftill fubject fuch fufficient fun's fuppofed furface fyftem greateſt himſelf increaſed inftrument interfects itſelf Jupiter king laft leaft lefs likewife mean Anomaly meaſure meridian moft moon moon's moſt motion move muft muſt node obferved occafion oppofite orbit paffing parallax perfon planets pofition pole prefent purpoſe reafon refpect reft reprefented rife round Saturn ſmall ſpace ſpots ſtars teleſcope thefe themſelves theſe thofe thoſe tion uſed Venus weft whofe