 ... part of an inch ; a quantity requiring a powerful microscope to be discerned at all. Let any one figure to himself, therefore, the difficulty of placing on the circumference of a metallic circle of such dimensions (supposing the difficulty of its...  Outlines of Astronomy - Page 86by John Frederick William Herschel - 1849 - 620 pagesFull view - About this book
 | Sir John Frederick William Herschel - Astronomy - 1833 - 444 pages
...radius, so that on a circle of (5 feet in diameter it would occupy no greater linear extent than -g^^th part of an inch ; a quantity requiring a powerful...marks, dots, or cognizable divisions, which shall be true to their places within such minute limits ; to say nothing of the subdivision of the degrees... | |
 | sir John Frederick W. Herschel (1st bart.) - 1833 - 500 pages
...that on a circle of 6 feet in diameter it would occupy BO greater linear extent than -, -^'Tl j, th part of an inch ; a quantity requiring a powerful...himself, therefore, the difficulty of placing on th'e ciicumference of a metallic circle of such dimensions (supposing the difficulty of its construction... | |
 | T. H. Croft MOODY - 1838 - 344 pages
...so that on a circle of 6 feet in diameter, it would occupy no greater linear extent than 1 -5,700th part of an inch ; a quantity requiring a powerful microscope to be discerned at all." Now, the ancients had neither telescopes nor microscopes, and when we consider " those inaccuracies... | |
 | Christianity - 1850 - 556 pages
...radius, so that on a circle of 6 feet in diameter it would occupy no greater linear extent than g?'6o part of an inch ; a quantity requiring a powerful...(supposing the difficulty of its construction surmounted), 260 marks, dots, or cognizable divisions, which shall all be true to their places within such narrow... | |
 | 1850 - 602 pages
...a metallic circle of such dimensions (supposing the difficulty of its construction surmounted), 260 marks, dots, or cognizable divisions, which shall...nothing of the subdivision of the degrees so marked off into minutes, and of these again into seconds. Such a work has probably baffled, and will probably... | |
 | Anna Cabot Lowell - Astronomy - 1850 - 412 pages
...radius, so that on a circle of six feet in diameter it would occupy no greater linear extent than -57*3-$ part of an inch ; a quantity requiring a powerful microscope to be discerned at all. Modern artists, however, carry these divisions to great delicacy. A circle of three and one quarter... | |
 | Edward Everett - Speeches, addresses, etc., American - 1859 - 872 pages
...so that on a circle of six f et in diameter, it would occupy no greater linear extent than -stVis- part of an inch ; a quantity requiring a powerful microscope to be discerned at all." * The largest body in our system, the sun, whose real diameter is 882,000 miles, subtends, at a distance... | |
 | Christianity - 1850 - 626 pages
...radius, so that on a circle of 6 feet in diameter it would occupy no greater linear extent than a; ' a6 part of an inch ; a quantity requiring a powerful microscope to be tliseeriied at all. Let any one figure to himself, therefore, the difficulty of placing on the circumference... | |
 | William Somerville Orr - Science - 1856 - 622 pages
...; so that on a circle of six feet in diameter it would occupy no greater linear extent than -jJ^th part of an inch, — a quantity requiring a powerful...(supposing the difficulty of its construction surmounted), SCO marks, dots, or cognizable divisions, which shall be true to their places within such minuto limits,... | |
 | Henry Barnard - Education - 1856 - 768 pages
...radius, so that on a circle of six feet in diameter, it would occupy no greater linear extent than 1-5700 part of an inch, a quantity requiring a powerful microscope to be discerned at all."* The largest body in our system, the sun, whose real diameter is 882.000 miles subtends, at a distance... | |
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