the hygrometer and thermometer. Forpurposes of standardization and adjustment a 100-ohm coil will be fur-nished with each instrument. When connected between the two bind-ing posts the bridge reading should of course be 1.0, if balanced againstthe 100 ohm coil. This test of the instrument should… … WASHINGTON: GOVERNMENT P R I N T I N G OF F I C E.1 899. Bulletin No. 1 5. s. 23. U.S. DEPARTMENT OF AGRICULTURE. DIVISION OF SOILS. ELECTRICAL INSTRUMENTS DETERMINING THE MOISTURE, TEMPERATURE,AND SOLUBLE SALT CONTENT OF SOILS. BY LYMAN J. BRIGGS, ASSISTANT CHIEF, DIVISION OF SOILS.
Soils Analysis · Electric apparatus and appliances
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