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Bog, hæftet The Silver Coulometer (Classic Reprint) af K. E. Guthe

The Silver Coulometer (Classic Reprint)

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Excerpt from The Silver Coulometer

Specifications, as referred to above, were prepared by the National Academy of Sciences and legalized in the United States in 1894. They are practically in conformity with the earlier specifications of the British Board of Trade and read as ... Læs mere

Excerpt from The Silver Coulometer

Specifications, as referred to above, were prepared by the National Academy of Sciences and legalized in t... Læs mere

Produktdetaljer:

Sprog:
Engelsk
ISBN-13:
9781334334016
Sideantal:
24
Udgivet:
01-11-2016
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Excerpt from The Silver Coulometer

Specifications, as referred to above, were prepared by the National Academy of Sciences and legalized in the United States in 1894. They are practically in conformity with the earlier specifications of the British Board of Trade and read as follows: In employing the silver voltameter to measure currents of about one ampere the following arrangements shall be adopted: The cathode on which the silver is to be deposited shall take the form of a plati num bowl not less than 10 cm. In diameter and from 4 to 5 cm. In depth.

The anode shall be a disk or plate of pure silver some 30 sq. Cm. In area and 2 or 3 mm. In thickness.

This shall be supported horizontally in the liquid near the top of the solution by a silver rod riveted through its center. To prevent the disintegrated silver which is formed on the anode from falling upon the cathode, the anode shall be wrapped around with pure filter paper, secured at the back by suitable folding.

The liquid shall consist of a neutral solution of pure silver nitrate containing about 15 parts, by weight, of the nitrate to 85 parts of water.

The resistance of the voltameter changes somewhat as the current passes. To prevent these changes having 'too great an effect on the current, some resistance besides that of the voltameter should be inserted in the circuit. The total metallic resistance of the circuit should not be less than 10 ohms.

Method of making a measurement. - The platinum bowl is to be washed consecutively with nitric acid, distilled water, and absolute alcohol. It is then to be dried at 160° C. And left to cool in a desiccator. When thoroughly cool it is to be weighed carefully.

It is to be nearly filled with the solution and connected to the rest of the circuit by being placed on a clean insulated copper support to which a binding screw is attached.

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Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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