^wfaeel rim flange has greedy exaggerated to indicate that in fad such a spacing docs exist.

The generator wheel 21 utilized in the implementation of the present invenuan has an 3.60 centimeter diameter and an axial rim dimension at 1.38 centimeters. The rim flange surfaces 21a which arc those fieid emanating areas cin<«iy adjacent the surfaces 23a of the pole pieces 23, are each 29 6 square centimeters. The rim portion <•( the 'A/heci has a volume of 55.7 cubic centimeters neglecting the rim turbine slots lib.

The generator wheel 21 and an associated mounting shaft 25 are mounted on the bearing frame 22 by means of enclosed double sets of matched high speed bearings 27.

Compressed air or nitrogen is used to drive the generator wheel by means of gas .impingement against turbine buckets lib ct:: in rhe wheel nm. The compressed gas is supplied through the supply ¡in- 23 and emanates from the air jet lube 29. of spin is sensed by light rays reflected from the rin. For this purpose every other quadrant on the rim suttece ;vas painted black. Accordingly, light directed a: the rim cf the wheel v.'i!l be reflected by the unpainied q'isdranr«? light-sensing ceils associated wi'.h a. rate-measuring circuit of conventional design. Since the rale-detecting means form r.o part of the present invention they have not been depicted in the actual drawing.

Shait members 39 carry suitable bearing members 31 for rotatably mounting the generator asembly wan respect to a second axis. The support assembly 17 oi FIG. 1 is pariizily represented in FIG. 4, and, as r.oicd above it provides the mounting means for positioning the generator assembly 14 with respect to the lower and upper m:^ members 12 and 13.

Before proceeding with ¿n explanation of the 0£.era-tics cf the generator asumb'y with respect to the apparatus of FIG. 1, reference is made to FIGS. 6 and 7 wbicn disclose an enlarged view or the detector 15. The lower and upper mass members 12 and 13 are given a conical configuration <o as to maximize kinemassic fieid densities la the area of the working air gap, within which the detector is positioned. FIG. 7 represents a sectional view taken across the working air gap, showing the projection of the cotiical section of the upper mass member upon the conicai section ot the lower mass member. Although symmetrical Ln shape, the projection of the conical surface ot the upper mass member onto the corresponding surface of tne Tower mass member has been slightly rcduccd for purposes of illustration. In the subject apparatus the two conical braes pole faccs 12a end 13a form a working air gap measuring 0.114 centimeter acro^. Each disc shape pole face measures 0.71 square centimeter in area.

The detector or probe 15 is of indium arsenide and is inserted in the detector air gap with a spacing from either pole face of 0.02 centimeter, the target thickness measuring 0.07 centimeter. Both indium and arsenic 55 process 1009b- isotope abundance ot half integral spin nuclei; arsenic nuclei consists of one isotope of threa halves proton spin, while indium nuclei are of two isotopes, both being of nine-halves proton spin.

A srrnnd probe of similar semi-conductor material 15,1 *n is shown in FIG. 6 as being positioned in close proximity to the first detector. Both piobes 15 ar.d 15a are shown mounted on a boom 15b which is shock mounted jy means not ;hown. Shock mounting of the components is important due to the relatively close spacing between the probe and conical pole faccs. Lateral displacement of the second probe from the vicinity of the working air gap measured as 25-centimeters.

Althouch not critical to the overall theory of the present iuvention, the selection of a semi-conductor probe of the nature heielofore described and the effective results realized through the petitioning of the probe 15 and the associated probe 15a with respect to the working air gap between the conical pole faces as well as the manner in which sigualj measured by the two probes

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