. Biographies of distinguished scientific men. Scientists. rhomb represent a section of the crystal looking down perpendicu- larly upon it, and snpposing the light to fall on it in the same perpen- dicular line, s s will be the projection of its principal section, and the short lines o and e will be the projections of the sections of the ordi- nary and extraordinary rays. Now let \is conceive this first crystal to retain its position, and its principal section s s to remain parallel to itself, as in Jig. 2, and a second crystal placed upon it, having its principal section s' s' in- clined at a
. Biographies of distinguished scientific men. Scientists. rhomb represent a section of the crystal looking down perpendicu- larly upon it, and snpposing the light to fall on it in the same perpen- dicular line, s s will be the projection of its principal section, and the short lines o and e will be the projections of the sections of the ordi- nary and extraordinary rays. Now let \is conceive this first crystal to retain its position, and its principal section s s to remain parallel to itself, as in Jig. 2, and a second crystal placed upon it, having its principal section s' s' in- clined at any angle to the former; then supposing the sections o and E to renaain as before, relatively to s s, that is one parallel, and the other perpendicular to it, when those rays enter the second crystal, the effect is that they can only pass through it in such portions as are either parallel or perpendicular to its principal section si s'. It be- comes then simply a case of resolution of motions, represented by the lines o, e, and it seems nearly impossible to imagine this without associating it with vibrations. At all events, the only way of con- ceiving the matter is to admit that in some way o is simply resolved into two components at right angles; one in the plane si si, the other perpendicular to it, which are represented by o„ and o^ In like manner e is resolved into e^ parallel to s' s', and e^ perpendicular to it. According to the inclination given to s' s', relative to s s, the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Arago, F. (François), 1786-1853; Smyth, W. H. (William Henry), 1788-1865, tr; Powell, Baden, 1796-1860, joint tr; Grant, Robert, 1814-1892, joint tr; Fairbairn, William, Sir, 1789-1874. Boston, Ticknor and Fields
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Keywords: ., bookcentury1800, bookdecade1850, bookpublisherbosto, bookyear1859
