 The inclination of the reflector that is in general most pleasing is 18°, 20°, or 22£°, or the 20th, 18th and 16th part of a circle ; but the planes may be set at any required angle, either by a metallic, a paper, or cloth joint, or any other simple...  Appleton's Dictionary of Machines, Mechanics, Engine-work, and Engineering - Page 971874Full view - About this book
 | Industrial arts - 1817 - 428 pages
...is 18°, 20', or 22|°, or the 20th, 18th, and 16th part of a circle, but the planes may be• st't at any required angle, either by a metallic, a paper,...smoothest edge in contact, they will have the form shewn in Fig. 1, where ABC is the aperture or angle formed by the plates. In this figure the plates... | |
 | Alexander Jamleson - 1821 - 456 pages
...the reflectors that is in general most pleasing is 18°, 20°, or <&%>, or the 20th, 18th, and 16th part of a circle, but the planes may be set at any...smoothest edge in contact, they will have the form shewn in Fig. I, where ABC is the aperture or angle formed by the plates. In this figure the plates... | |
 | Charles Frederick Partington - Science - 1828 - 468 pages
...the reflectors that is in general most pleasing, is 18°, 20°, or 22^°, or the 20th, 18th, and 16th part of a circle, but the planes may be set at any...contrivance. When the two planes are put together, with their straitest and smoothest edges in contact, they will have the form shown in the diagram ABCD, where... | |
 | Encyclopaedia Americana - 1831 - 608 pages
...of the reflector that is in general most pleasing is 18°, 20°, or22J°, or the 20th, 18th and 16th part of a circle; but the planes may be set at any...smoothest edge in contact, they will have the form shown in figure ], where А В С is the aperture or angle formed by the plates. In this figure the... | |
 | Luke Hebert - Industrial arts - 1835 - 938 pages
...inclination of the reflector that is in general most pleasing is 18", 20<>, 22J° or the 20th, 18th, and 16th part of a circle ; but the planes may be set at any...instrument is thus constructed, it may be covered up either with paper or leather, or placed in a cylindrical or any other tube, so that the triangular... | |
 | Francis Lieber, Edward Wigglesworth - Encyclopedias and dictionaries - 1835 - 608 pages
...the reflector that is iu general most pleasing is 18°, 20°, or 224°, or the 20th, 18th and 16th part of a circle; but the planes may be set at any...contrivance. When the two planes are put together, with theu ' straightest and smoothest edge in contact, they will have the form shown in figure 1, where... | |
 | Luke Hebert - Industrial arts - 1836 - 942 pages
...of the reflector that is in general most pleasing is 18°, 20°, 22J° or the 20th, 18th, and 16th part of a circle ; but the planes may be set at any...instrument is thus constructed, it may be covered up either with paper or leather, or placed in a cylindrical or any other tube, so that the triangular... | |
 | Francis Lieber, Edward Wigglesworth - Encyclopedias and dictionaries - 1838 - 618 pages
...pleasing is 18°, 20°, or 224°, or the 20th, 18th and 16th part of a circle ; but the planes may be eet at any required angle, either by a metallic, a paper,...smoothest edge in contact, they will have the form shown in figure 1, where А В С is the aperture or angle formed by the plates. In this figure the... | |
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