. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. 230 USE OF THE MICBOSCOrE. To convert Paris Lines into English Measure. Multiply the numerator of the fraction -^-^ by the number of Paris lines stated, or divide the denominator of the fraction by the same nmnber, or multiply the number .088815 by the number of lines and parts of the same. To convert Millimetres into English Measure. Multiply the number .039371 by the number of millimetres and parts of the same, the
. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. 230 USE OF THE MICBOSCOrE. To convert Paris Lines into English Measure. Multiply the numerator of the fraction -^-^ by the number of Paris lines stated, or divide the denominator of the fraction by the same nmnber, or multiply the number .088815 by the number of lines and parts of the same. To convert Millimetres into English Measure. Multiply the number .039371 by the number of millimetres and parts of the same, the quotient will be the equivalent measure in decimal parts of the English inch. The line is often made use of in scientific works in this country; but as no two persons are agreed as to whether its ^•alue is the one-tenth or one-twelfth of an inch, it follows that, in all measures in which it is employed, the value attached to it should be stated; if the Paris line be the one adopted, neither the one-tenth or one-twelfth of an English inch is its correct value, although the latter number comes nearest the truth. CHAPTER V. CAMERA LUCIDA. The camera lucida, before described at page 144, was invented by Wollaston in 1807. It consists of a four-sided prism of glass, as represented in sec- tion by fig. 149, the sides and angles being similar to those shown by A B C D. The rays of light proceeding from an ob- ject, MN, after being reflected by the faces, D C, C B to the eye will be referred by an ob- server to m n, and an image of the object will be there. 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 Quekett, John, 1815-1861. London, H. Bailliere; [etc. , etc. ]
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