A Laboratory Course in Plant Physiology
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In our eReader you can find the full English version of the book. Read A Laboratory Course in Plant Physiology Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book A Laboratory Course in Plant Physiology
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The most accurate instrument is the mer- curial barometer, too well known to need comment. It is obtainable self- registering, but at very large expense, and the commonly used autographic form is the barograph. The Richard form (Fig. 47) has inside the case eight aneroid barometer boxes, viz., elastic-iron vacuum boxes; these swell and shrink with variations in pressure, and communicate their motion to an arm which records precisely as for the thermograph, the record paper being ruled to corres...pond with millimeters of mercury of the mercurial barometer.
The Richard instruments are made by Richard Freres of Paris and cost from about $35.00 to $45.00 each, without duty. They are made in substantially the same form, but at higher prices, by JtrLiEN P. Friez of ELIMINATION 183 Belfort Observatory, Ealtimore, Md. The Draper forms are made at less cost by the Draper Manufacturing Company of New York City. All of these instruments are prone to work out of true and should be standardized often by comparison with standard thermometer, wet- and dry-bulb thermom- eters, and mercurial barometer respectively.
What to read after A Laboratory Course in Plant Physiology?
You can find similar books in the "Read Also" column, or choose other free books by William Francis Ganong to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The most accurate instrument is the mer- curial barometer, too well known to need comment. It is obtainable self- registering, but at very large expense, and the commonly used autographic form is the barograph. The Richard form (Fig. 47) has inside the case eight aneroid barometer boxes, viz., elastic-iron vacuum boxes; these swell and shrink with variations in pressure, and communicate their motion to an arm which records precisely as for the thermograph, the record paper being ruled to corres...pond with millimeters of mercury of the mercurial barometer.
The Richard instruments are made by Richard Freres of Paris and cost from about $35.00 to $45.00 each, without duty. They are made in substantially the same form, but at higher prices, by JtrLiEN P. Friez of ELIMINATION 183 Belfort Observatory, Ealtimore, Md. The Draper forms are made at less cost by the Draper Manufacturing Company of New York City. All of these instruments are prone to work out of true and should be standardized often by comparison with standard thermometer, wet- and dry-bulb thermom- eters, and mercurial barometer respectively.
What to read after A Laboratory Course in Plant Physiology?
You can find similar books in the "Read Also" column, or choose other free books by William Francis Ganong to read onlineMoreLess
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