The Telescope
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In our eReader you can find the full English version of the book. Read The Telescope Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Telescope
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Dove of Berlin, gave in 1851 the name of reversion prism to the combination of two prisms placed normally one behind the other so that their corresponding faces were perpendicular. He presented this disposition as an im- portant new discovery made by himself. He doubtless did not know that M. Porro, who deserves all the honor of this charming application, had realized it long before him. " A little later M. Porro produced what is commonly referred to as Porro's second form, which is derived dir...ectly from annexing A Fig. 115 to the corresponding half of C as a single prism, the other half of B being similarly annexed to the prism C, thus form- 158 THE TELESCOPE ing two sphenoid prisms, such as are shown in Fig. 118 which may be mounted separately or may have their faces cemented together to save loss of light by reflections. The sphenoid prisms have had the reputation of being much more difficult to construct than the plain right angled prisms of the other forms shown. In point of fact they are not particularly difficult to make and the best inverting eye pieces for telescopes are now con- Fio.
What to read after The Telescope?
You can find similar books in the "Read Also" column, or choose other free books by Louis Bell to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Dove of Berlin, gave in 1851 the name of reversion prism to the combination of two prisms placed normally one behind the other so that their corresponding faces were perpendicular. He presented this disposition as an im- portant new discovery made by himself. He doubtless did not know that M. Porro, who deserves all the honor of this charming application, had realized it long before him. " A little later M. Porro produced what is commonly referred to as Porro's second form, which is derived dir...ectly from annexing A Fig. 115 to the corresponding half of C as a single prism, the other half of B being similarly annexed to the prism C, thus form- 158 THE TELESCOPE ing two sphenoid prisms, such as are shown in Fig. 118 which may be mounted separately or may have their faces cemented together to save loss of light by reflections. The sphenoid prisms have had the reputation of being much more difficult to construct than the plain right angled prisms of the other forms shown. In point of fact they are not particularly difficult to make and the best inverting eye pieces for telescopes are now con- Fio.
What to read after The Telescope?
You can find similar books in the "Read Also" column, or choose other free books by Louis Bell to read onlineMoreLess
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