Sidebilder
PDF
ePub
[ocr errors]

(b.) Wild's POLARISCOPE.

§ 49. Description of the instrument

§ 50. Arrangement for constant temperature

§ 51. Process of taking observations

§ 52. Mode of ascertaining the direction of the rotation

§ 53. Do. in dealing with solutions of high rotatory power

$ 54. Degree of accuracy attainable. Examples of actual observations

107

110

110

112

113

115

(c.) HALF-SHADE INSTRUMENTS OF JELLETT, CORNU, AND LAURENT.

$ 55. Jellett's instrument

§ 56. Cornu's instrument

§ 57. Laurent's instrument

§ 58. Optical principle of Laurent's instrument

$ 59. Process of taking observations. Examples of actual observations

117

117

118

120

121

[ocr errors]

(a.) THE SOLEIL-VENTZKE-SCHEIBLER SACCHARIMETER.

§ 77. Description of the instrument

§ 78. Explanation of the action of the several parts

§ 79. External form of the instrument

$ 80. Mode of taking observations

155

156

159

160

[ocr errors]

B. Determination of Glucose.

190

191

§ 97. Calculation of the percentage of glucose in dilute solutions from the

angle of rotation

$ 98. Table of corrected values for solutions of higher concentration

$ 99. Use of saccharimeters with Ventzke's or Soleil's scale, or with special

scale ..

$ 100. Determination of grape-sugar in diabetic urine

$ 101. Detection of potato-sugar in “ chaptalized” wine

193

194

195

ILLUSTRATIONS.

NO. OF ILLUSTRATION.

PAGE

..

1

1

2

3

3

4

5

..

6

7

9

68

16.

71

76

1. TRANSVERSE SECTION OF RAY OF LIGHT

2. LINEAR POLARIZED RAY 3, 4. POLARIZATION BY REFLECTION

5. RHOMBOHEDRON OF ICELAND SPAR ..

6. REFRACTION OF LIGHT BY ICELAND SPAR ..
7–10. CONSTRUCTION OF NICOL'S PRISM
11, 12. POLARIZER AND ANALYZER

13. INSTRUMENT WITH POLARIZER AND ANALYZER
14. PLANE OF POLARIZATION OF FIXED POLARIZER
10A. CONSTRUCTION OF NICOL's PRISM
15. GRAPHIC REPRESENTATION OF SPECIFIC ROTATIONS

GRAPHIC REPRESENTATION 17. GRAPHIC REPRESENTATION 18. GRAPHIC REPRESENTATION

GRAPHIC REPESRENTATION 20.

APPARATUS FOR QUALITATIVE EXAMINATION OF ROTATORY POWER 21. MITSCHERLICH'S INSTRUMENT 22. LAMP FOR INSTRUMENT 23. VERTICAL BAND OF LIGHT 24. CHANGE OF DIRECTION OF PLANE OF POLARIZATION 25. LAMP FOR INSTRUMENT

26. MITSCHERLICH'S LARGER INSTRUMEN 27, 28. Wild's POLARISCOPE .. 29. ARRANGEMENT OF APPARATUS FOR OBSERVATION..

PARALLEL FRINGES IN FIELD OF VISION 31-34. RELATIVE DIRECTIONS OF ROTATION :::), 36. RELATIVE DIRECTIONS OF ROTATION

80

[blocks in formation]
« ForrigeFortsett »