1010 TFIE BELL SYSTEM TECHNICAL JOURNAL, JULY 1953 



Hamming, R. W., see R. M. Bozorth. 



Hannay, N. B., see A. J. Ahearn. 



Hartman, C. D., see J. A. Becker. 



Hewitt, W. P., see W. P. Mason. 



HuLM, J. K., see B. T. Matthias. 



Jones, H. L."* 

 Approximating the Mode From Weighted Sample Values, Am. Stat. 

 Assoc, J., 48, pp. 113-127, Mar., 1953. 



The weighted mean of ordered sample observations can be used to approxi- 

 mate the mode under favorable conditions, where the weights are determined 

 from the first two terms in a Taylor expansion of the maximum Hkelihood 

 estimate. Such weights are shown in Table 1 for the case where the sample 

 is selected from a ^distribution with known kurtosis. 



Lebert, a. W., see J. J. Drvostep. 



Lewis, H. W.' 



Calibration of the Rolling Ball Viscometer, Anal. Chem., 25, pp. SOT- 

 SOS, Mar., 1953. 



Mason, W. P.,' W. H. Hewitt' and R. F. Wick' 



Hall Effect Modulators and "Gyrators" Employing Magnetic Field 

 Independent Orientations in Germanium, J. Appl. Phys., 24, pp. 166- 

 175, Feb., 1953 (Monograph 2079). 



Three uses for the Hall effect in germanium crystals are described. These are 

 (1) use of Hall effect probes in measuring magnetic flux, (2) use of Hall effect 

 in crystals to produce a pure product modulator, and (3) use of Hall effect in 

 germanium crystals to produce a nonreciprocal transmission. If the resistances 

 are shunted around such gyrators, the transmission can be made zero in one 

 direction and finite in the other. In all these applications, use is made of a 

 crystal orientation for which the cross magneto-resistance effects are zero and 

 the Hall effect constant does not vary with field by more than 2 per cent out 

 to a flux density of 20,000 gausses. This orientation was located by making a 

 phenomenological study of the magneto-resistance and Hall effect corrections 

 for a cubic crystal and evaluating constants experimentally. Correction terms 

 to fourth and fifth powers of the magnetic field have been obtained. 



* Bell Telephone Laboratories, Inc. 



* Illinois Bell Tclephoiio Company. 



