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Updated: June 18, 2025
It is often the only way of differentiating between various kinds of blood. "The variations in crystals in the blood are in part of form and in part of molecular structure, the latter being discovered only by means of the polarising microscope. A blood-crystal is only one two-thousand-two-hundred-and-fiftieth of an inch in length and one nine-thousandth of an inch in breadth.
The silver is coated with rough platinum to increase the surface and help to dislodge the hydrogen as bubbles and keep it from polarising the cell. The Bunsen, Grove, and Smee batteries are, however, more used in the laboratory than elsewhere. The Leclanche is a fairly constant cell, which requires little attention.
Using a polarising photometer, he found that only 13 per cent. of the violet rays escape at the edge of the solar disc, 16 of the blue and green, 25 of the yellow, and 30 per cent. of the red.
But if, by clinging to the exact letter of the fact, you create a false opinion in his mind, as I should do in my father's case, if by telling him at once of my change, I gave him an unjust horror of Catholicism, you do not tell him the truth. . . . You may speak what is true to you, but it becomes an error when received into his mind. . . . If his mind is a refracting and polarising medium if the crystalline lens of his soul's eye has been changed into tourmaline or Labrador spar- -the only way to give him a true image of the fact, is to present it to him already properly altered in form, and adapted to suit the obliquity of his vision; in order that the very refractive power of his faculties may, instead of distorting it, correct it, and make it straight for him; and so a verbal wrong in fact may possess him with a right opinion. . . .
The instrument employed by them is constructed on the polarising principle as adapted by Zöllner. Photographic photometry has meanwhile risen to an importance if anything exceeding that of visual photometry. For the usefulness of the great international star-chart now being prepared would be gravely compromised by systematic mistakes regarding the magnitudes of the stars registered upon it.
A wedge of neutral-tint glass, accurately divided to scale, is placed in the path of the stellar rays, when the thickness of it they have power to traverse furnishes a criterion of their intensity. Professor Pickering's "meridian photometer," on the other hand, is based upon Zöllner's principle of equalization effected by a polarising apparatus.
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