 | 1844 - 686 pages
...length, and about '48 inch in breadth and thickness, divided into two equal portions (see fig. 3, Pl. 12) in a plane passing through the acute lateral angles, and nearly touching the obtuse solid angles. The sectional plane of each of these halves must be carefully polished, and the portions cemented firmly... | |
 | John Quekett - 1848 - 544 pages
...constructed after the plan of the late Mr. Nicol, of Edinburgh, who employed for the purpose a rhomb of the spar divided into two equal portions, in a plane passing...of nearly the same size and shape as it was before the cutting ; by this arrangement the two rays into which a beam of ordinary light passing through... | |
 | Jabez Hogg - 1854 - 550 pages
...of one-fourth of an inch in length, and about four-eighths of an inch in breadth and thickness, is divided into two equal portions in a plane, passing through the acute lateral angle, and nearly touching the obtuse solid angle. The sectional plane of each of these halves must... | |
 | John Quekett - 1855 - 1022 pages
...constructed after the plan of Mr. Nicol, of Edinburgh, who employed for the purpose a rhomb of the spar divided into two equal portions, in a plane passing...form a rhomb of nearly the same size and shape as before the cutting ; by this arrangement only one of the two rays, into which a beam of ordinary light,... | |
 | Benjamin Pike - 1856 - 412 pages
...for the microscope is a crystal of Iceland spar, called Nicol's prism, consisting of a rornb of the spar divided into two equal portions, in a plane passing...angles, the cut surfaces having been carefully polished, are then cemented together with Canada balsam, so as to form a romb of nearly the same shape as it... | |
 | Jabez Hogg - 1856 - 530 pages
...of one-fourth of an inch in length, and about four-eighths of an inch in breadth and thickness, is divided into two equal portions in a plane, passing through the acute lateral angle, and nearly touching the obtuse solid angle. The sectional plane of each of these halves must... | |
 | Jabez Hogg - 1858 - 644 pages
...of one-fonrth of an inch in length, and about four-eighths of an inch in breadth and thickness, is divided into two equal portions in a plane, passing through the acute lateral angle, and nearly touching the obtuse solid angle. The sectional plane of each of these halves must... | |
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Iceland spar of one-fourth of an inch in length, and about four-eighths of an inch in breadth and thickness, is divided into two equal portions in a plane, passing through the acute lateral angle, and nearly touching the obtuse solid angle. The sectional... 