Inhaltsangabe
Excerpt from Instruments and Methods Used in Radiometry II
In the instruments now to be described, the success attained in construction results from the use of the electrically heated welding device and from the choice of wire (silver) which is easily freed from sulphide. The silver wire contributes but little thermo electrically, but this is compensated by its extremely low resistance, which is about ohms per centimeter for wire 5 mm in diameter. One need not, therefore, exercise any great care in making the silver wires of a minimum length to produce a low resistance thermopile. A preliminary heating brightens and anneals the wire; a procedure which can not be followed in cleaning copper and iron wire. The use of pure tin in welding produces an alloy which is not brittle. The construction of the thermo elements of bismuth and silver is therefore an easy process so that after attaining some skill they can be made at the rate of 15 to 20 per hour. The instrument can, therefore, be built in any laboratory, and of the proper design to suit the problem under investigation.
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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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Excerpt from Instruments and Methods Used in Radiometry II
In the instruments now to be described, the success attained in construction results from the use of the electrically heated welding device and from the choice of wire (silver) which is easily freed from sulphide. The silver wire contributes but little thermo electrically, but this is compensated by its extremely low resistance, which is about ohms per centimeter for wire 5 mm in diameter. One need not, therefore, exercise any great care in making the silver wires of a minimum length to produce a low resistance thermopile. A preliminary heating brightens and anneals the wire; a procedure which can not be followed in cleaning copper and iron wire. The use of pure tin in welding produces an alloy which is not brittle. The construction of the thermo elements of bismuth and silver is therefore an easy process so that after attaining some skill they can be made at the rate of 15 to 20 per hour. The instrument can, therefore, be built in any laboratory, and of the proper design to suit the problem under investigation.
About the Publisher
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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