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size, the up'per circuit member has an overall length of - round the dctecror 15 and associated equipment and thus

56 centimeters and a, mass of 43 kilograms.

It will be seen that the constituents of the mass members are such as satisfy the criteria of half integral spin nuclei material for those apparatus parts associated with the field and the use of con-spin nuclei material for those parts where iL is desired to inhibit the field. Accordingly, ail support or structural members, such as the horizontal structural element 10, consist of steel. The iron and carbon nuclei of these structural members are classed as no-spin nuclei and thus represent high relative reluctance to the kinemassjc field. Supports 16 arc provided to accommodate the suspension of the upper mass member 13. The supports 16 are of steel the same as the horizontal support element 10. The high relative reluctance of steel to the kinemas>ic field minimizes the field flux loss created in the field series circuit of mass members 12 and 13, the generator 14, and the detector 15. The loss of field strength is further minimized by employing high-reluctance isolation bridges at the points of contact between the lower a;id upper mass members 12 and 13, and the structural support members 10 and 16.

Shunt losses within the. apparatus were, in general, minimized by employing the technique of minimum mass contact; the use of'lo-v f.eld permeability material at the isolation bridges or structural connections; and avoiding bulk mass proximity.

A number of techniques were developed for optimizing the isolation bridge units including Carboloy cores and serve to further stabilize the temperature conditions, rhercpy diminishing the adverse effects due to thermal gradients.

Before procecdine with the exnlannficn of the operation 45 of the apparatus disclcscd in FTJS. 1 and 2, a more detailed description uf certain portions of the structure will b<r givi»n.

FTGS. j. 4 3r»d 5 present the zenera'or assembly 14 of FTGS. I and 2 in erenter detail. In particular, fhe^e ncires disclose the relationship between a freelv rouble wheel 21, a be^rinjz frame 22. and a pair of role nieces 23. The bearing frame 22 is of structural steel, and funcions to snafially orient the three generator parts without shunting the generated fieid potential.

Positioning of the generator wh'el 21 with respcct to the cooperative faces of the poic r'eces 23 is effected by way of the bearing frame upon which 'he generator wheel is mounted. In this respect the hich-rehictance isolation bridges mentioned with reipect to FIGS. 1 and 2 are herein shown as seise:ews 24 which ar* adjustably positioned to cooperate with hardened steel platens 25. The setscrews 24 are mounted on the pole pieces 23 2nd are adjestahiy positioned with respect to steel platen-; 25 cemented to the bearing frame 22 20 as :o facilitate the centering of the generator wheel 21 with respcct to the interface surfaces 23« of the pole pieces 23.

In the implementation of the present invention the air gap formed between the generator wheel rim fiances and

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