Pure Products Volume 1 (Paperback)


This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 Excerpt: ...in the manipulation of which only one adjustment is necessary, would be more convenient than Tornoe's. Abbe has said that the apparatus might be considerably simplified, and its manipulation accomplished in much less time, if the measurements were based on the observation of the total reflections of the rays in a very thin layer of the liquids examined, enclosed between prisms of a higher refractive index. This is the principle of the Wollny-Zeiss butyro-refractometer, of Wollny's milk-fat refractometer and of the sea water refractometer. All these instruments are chiefly employed in the analysis of foods. The most recent as well as the most perfect instrument of this type is the Pulfrich immersion refractometer. It is also the simplest in construction; for while the older instruments of Pulfrich and Abbe require two prisms--one in the refractometer proper and one for illumination--the new construction has only the former prism. An attachable vessel enables the examination of drops of a given liquid. Generally, however, it is better to examine larger quantities. Ordinary white light is used, and the line of demarcation is made achromatic, precisely as in Abbe's instrument. The immersion refractometer has the shape of a telescope, and its ocular is similar to that of the latter. It magnifies ten times, permitting a much sharper reading of the position of the line of demarcation than in similar instruments, and thus insures a corresponding increase in the accuracy of the measurements. The scale includes the indices of refraction from 1.32539 up to 1.640, permitting the use of aqueous, alcoholic and ethereal solutions. The error in reading does not exceed one in the fifth decimal place--a remarkable degree of accuracy. In all refractometric measurements specia...

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 Excerpt: ...in the manipulation of which only one adjustment is necessary, would be more convenient than Tornoe's. Abbe has said that the apparatus might be considerably simplified, and its manipulation accomplished in much less time, if the measurements were based on the observation of the total reflections of the rays in a very thin layer of the liquids examined, enclosed between prisms of a higher refractive index. This is the principle of the Wollny-Zeiss butyro-refractometer, of Wollny's milk-fat refractometer and of the sea water refractometer. All these instruments are chiefly employed in the analysis of foods. The most recent as well as the most perfect instrument of this type is the Pulfrich immersion refractometer. It is also the simplest in construction; for while the older instruments of Pulfrich and Abbe require two prisms--one in the refractometer proper and one for illumination--the new construction has only the former prism. An attachable vessel enables the examination of drops of a given liquid. Generally, however, it is better to examine larger quantities. Ordinary white light is used, and the line of demarcation is made achromatic, precisely as in Abbe's instrument. The immersion refractometer has the shape of a telescope, and its ocular is similar to that of the latter. It magnifies ten times, permitting a much sharper reading of the position of the line of demarcation than in similar instruments, and thus insures a corresponding increase in the accuracy of the measurements. The scale includes the indices of refraction from 1.32539 up to 1.640, permitting the use of aqueous, alcoholic and ethereal solutions. The error in reading does not exceed one in the fifth decimal place--a remarkable degree of accuracy. In all refractometric measurements specia...

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Product Details

General

Imprint

Rarebooksclub.com

Country of origin

United States

Release date

May 2012

Availability

Supplier out of stock. If you add this item to your wish list we will let you know when it becomes available.

First published

May 2012

Authors

Dimensions

246 x 189 x 14mm (L x W x T)

Format

Paperback - Trade

Pages

262

ISBN-13

978-1-236-35384-9

Barcode

9781236353849

Categories

LSN

1-236-35384-6



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