The construction and principle of operation of a new type of quartz fiber torsion balance are described. The quartz suspension fiber used can be as small as 0.5‐μ diameter. This enables magnetic measurements to be made on an individual microscopic magnetic particle of about 1‐μ diameter.
REFERENCES
1.
H. Pettersson, Dissertation, University of Stockholm, Goteberg, Sweden (1914).
2.
H. V. Neher, in J. Strong, Procedures in Experimental Physics (Prentice‐Hall, Inc., New York, 1941), pp. 217–258.
3.
4.
Reference 2, pp. 188–216.
5.
6.
The mirrors were obtained from the Westinghouse Electric Corporation. They are used in their oscillographs.
7.
Pink base plate wax, manufactured by Patterson‐Hattinger, was used.
8.
In early experiments, current was passed through only one coil, the other coil being disconnected. For this connection, the two torques differed by some small factor. As a result, the deflection in one direction was very different from the one in the other direction.
9.
All samples were obtained from the General Electric Company, Lamp Division, Cleveland 10, Ohio.
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© 1956 The American Institute of Physics.
1956
The American Institute of Physics
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