Principles of Physics

Principles of Physics

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 edition. Excerpt: ... Place a pin at A, or, better, make a mark with black or red ink at A. Using the pin, look through the edge, DE, and (keeping the head a foot away from DE) move till the pin, seen over the glass, is directly in line with the part of the pin seen through the glass. Move the head slowly toward E, and, when the image seen through the glass has moved a considerable distance, place another pin at B, covering the image of the pin A. B should be well down toward E. Move the head a little, right and left, and notice the image of A move back and forth past the pin B. It is well to place a book or block on G, to hide the part of the pin, A, that projects above the plate. Hold the head so that B covers the image of A, and place a third pin at C, covering both; that is, the pin C alone is seen, because B and the image of A are exactly behind C and are hidden by it. With a sharp pencil draw a line on the paper along the edge DE; make a little circle around each of the pins, A, B, and C, and remove the pins and plate glass. Where the plate was, write the word " glass" faintly in large letters. Using the corner of a sheet of paper, draw the perpendicular, or normal, BN, Fig. 261. Lay the sheet of paper used for a square with one edge on BE and with the corner at B. Draw along the edge, extending the line NB to M. With B as a centre, and any radius, the longer the better, draw either a whole circle or the portions shown in Fig. 261. Draw GH and FK perpendicular to Nil. Measure GH and FA', and divide FA' by GH. The quotient is the index of refraction of the glass. The setting of B and C (Fig. 260) to cover the image of.1 is made more exact if a colored ink-mark is made at A, instead of using the pin. Repeat, placing the pin B, Fig. 260, more

Product details

  • Paperback | 158 pages
  • 189 x 246 x 9mm | 295g
  • United States
  • English
  • black & white illustrations
  • 1236761944
  • 9781236761941