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A Balanced Direct‐Current Amplifier for Alternating‐Current Operation
1.R. Stair and I. F. Hand, “Methods and Results of Ozone Measurements over Mount Evans, Colo.” Mo. Wea. Rev. 67, 331 (1939).
2.Westinghouse Electric and Mfg. Co., Bloomfield, N. J. Portable Ultraviolet Meter. Bulletins TD‐82, TD‐82B; Information Bulletins Nos. 2, 10.
3.A. H. Taylor, “Portable Ultraviolet Meters,” J. Opt. Soc. Am. 24, 183 (1934).
3.A. H. Taylor and George P. Kerr, “A Direct Current Amplifier with Good Operating Characteristics,” Rev. Sci. Inst. 4, 28 (1933).
4.Irving F. Hand, “Review of U.S. Weather Bureau Solar Radiation Investigations,” Mo. Wea. Rev. 65, 420 Washington, D.C. (1937).
4.See also U.S. Weather Bureau Circular Q. Pyrheliometers and pyrheliometric measurements.
5.Richard E. Vollrath, “A Duo‐Triode Bridge Voltmeter,” Rev. Sci. Inst. 10, 361 (1939).
6.Henry P. Kalmus, “A Stabilized Bridge Circuit,” Electronics 12, 30, Dec. (1939).
7.R. Stair, J. Research Nat. Bur. Stand. 22, 295 (1939) R. P. 1181.
8.Raytheon 60‐watt voltage regulator type VR. 2‐W1517.
9.Type 24A tubes, rather than type 57, for example, were used by the authors solely because a better match was found between two particular type 24A tubes.
10.Individual tubes of the same type and make often differ sufficiently so that a readjustment of the resistance values should be made if it becomes necessary to replace the amplifier tubes.
11.W. W. Coblentz and R. Stair, J. Research Nat. Bur. Stand. 16, 315 (1936) R. P. 877.
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