The Optical Rotating Power of Organic Substances And Its Practical Applications
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The wedge angle of the quartz is usually taken at 3°, so that the distance between the o and 100 points on the scale is about 30.5 mm. The whole interval is divided into 100 equal parts, and by a vernier, one-tenth Ventzke may be read off. In the simple wedge-compensation, the two wedges are usually positive, and the compensation plate negative and about 4.3 mm. in thickness. If the large wedge is then moved toward the 100 point, the thickness of the two wedges de- creases.
128. Testing the Sac...charimeter Scale. — As the agreement of dif- ferent saccharimeters at the 100 point leaves little to be desired, it may be asked now how the scale of a single instrument may be tested between the zero-point and 100 point. The error in graduation in the scale and vernier should remain everywhere below 0.05° V. The ivory" scales formerly commonly used have been abandoned, and properly, because their length is influenced by the moisture in the air ; the changes amount to 0.3° V and more. The nickelin scales now commonly used are free from this error, and are also independent of changes in temperature as the change in length between o and 100, with a temperature fluctuation of 10°, is only about 0.01° V.
What to read after The Optical Rotating Power of Organic Substances And Its Practical Applications?
You can find similar books in the "Read Also" column, or choose other free books by H Hans Landolt to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The wedge angle of the quartz is usually taken at 3°, so that the distance between the o and 100 points on the scale is about 30.5 mm. The whole interval is divided into 100 equal parts, and by a vernier, one-tenth Ventzke may be read off. In the simple wedge-compensation, the two wedges are usually positive, and the compensation plate negative and about 4.3 mm. in thickness. If the large wedge is then moved toward the 100 point, the thickness of the two wedges de- creases.
128. Testing the Sac...charimeter Scale. — As the agreement of dif- ferent saccharimeters at the 100 point leaves little to be desired, it may be asked now how the scale of a single instrument may be tested between the zero-point and 100 point. The error in graduation in the scale and vernier should remain everywhere below 0.05° V. The ivory" scales formerly commonly used have been abandoned, and properly, because their length is influenced by the moisture in the air ; the changes amount to 0.3° V and more. The nickelin scales now commonly used are free from this error, and are also independent of changes in temperature as the change in length between o and 100, with a temperature fluctuation of 10°, is only about 0.01° V.
What to read after The Optical Rotating Power of Organic Substances And Its Practical Applications?
You can find similar books in the "Read Also" column, or choose other free books by H Hans Landolt to read onlineMoreLess
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