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References and Notes:

1 Schiff,L.I.: Possible New Experimental Test of General Relativity Theory.
   PRL 4(1960)215-17.

2 Gill, D. et al.: Requirements and an Approach for Coating the Gravity Probe B Gyroscope Rotor.
   Surface and Coatings Technology, 36(1988)471-8.

3 Heraeus - Amersil: Quartz Glass for Optics, Data and Properties, gives for Homosil: bubble class 0, striae grade A , change in index of  refraction across 150 mm less than 1 ppm, residual strain < 5 nm/cm, OH content ~200 ppm.

4 De Freitas, J.M. and M.A.Player: Ultrahigh precision measurements of optical heterogeneity of high quality fused silica.
   Applied Physics Letters 66(1995)3552-4.

5 Wacker , product description., monocrystalline silicon. N-type Phosphorus, Oxigen content 1016 At cm-3 Carbon content ~2 1016 At cm-3.
   Dopant radial variation: 10% for <111> orientation.

6 Angele, W.:Finishing high precision quartz balls.
   Precision Engineering 2(1980)119-22.

7 Lindbergh, E. - DeBra, D., private communication.

8 Minarik Electric,
   321 E. Boyd St., Los Angeles, CA 90013.

9 PC-DSP Motion Controller, Motion Engineering,
   520 E. Montecito St., Santa Barbara, CA 93103.

10 note: in another type of machine, described in: Polishing a 1- kg silicon sphere fora density standard, by A.Leistner and G. Zossi in Applied Optics Vol.26 No.4 (1987) and used in ref.: A. J. Leistner:  Fabrication of 1 KG Single Crystal Silicon Super-precision Spheres (Balls) for the Avogadro's Experiment, Proceedings of Silicon Machining 1998 Spring Topical Meeting, ASPE (American Society of Precision Engineering) pg. 101-4, sphere has to be moved by hand (private communication).

11 The device was designed and constructed by students in Precision Engineering class under the guidance of Prof. D.DeBra.

12 Precision Engineering class students, under the guidance of Prof. D.DeBra designed and constructed the device and measured the sphere absolute diameter. This was reported, but never published. The participating students were D. Barksdale, G.Chaterjee and L. Chavez.

13 Lipa, J. and Siddall G.J.: High Precision Measurement of Gyro Rotor Sphericity
     Precision Engineering 2(3).

14 DiDonna, B. : Suspension Torque Predictions for Relativity Gyroscope Experiment.
     Undergraduate Honors Thesis, Dept. of Physics, Stanford University.

15 Several students participated in development of measurement and analysis programs. The programs are written in Pascal language. The original program was written under the guidance of  Prof. J. Turneaure by R.Hofmann. Later A.Stoica and G. Chang worked on the version which was used for several years. Finally M.Rozler and Chizhevsky brought the program in present state.

16 Davidson Optronics, 2223 Ramona Boul., West Covina, CA 91790
     Speedring, 6717 AlL Hwy 157,  Cullman, AL 35056-1588.

17 Micro Abrasives Corporation,
     720 Southhampton Road, Westfield MA 01086.

18 a) Universal Photonics Inc.,
         495 West John St., Hicksville, NY 11801.

     b) Selective Particle Technology,
         46 Herrontown Circle, Princeton, NJ 08540.

     c) Baikalox Baikowski International Corp.,
         1833-B Crossbeam Dr. Charlotte, NC 28217.

19 Graham, V. A.:

a) Investigation of Gyro Rotor Surface Quality during Manufacturing,
    GP-B Internal Report, Stanford Univ. 1991.

b) Manufacture of Ultra-Precision Spherical Rotors for Gravity Probe B Gyroscopes,
    GP-B Internal Report, Stanford Univ. 1992.

c) Investigation into Sphericity and Surface Quality of Fused Silica Gyro Rotors
    GP-B Internal Report, Stanford Univ. 1993.

20 Marcelja F., Keiser, G.M.: Silicon Spheres for Gravity Probe B Experiment,
     Proc. of ASPE Spring Topical Meeting on Silicon Machining pg. 74-6, 1998.

21  Metrologia, Vol. 31 numb. 3 Nov. 1994,  International Workshop on the Avogadro Constant and the Representation of Silica Mole

22  C.Willsch: Diplomarbeit, Aachen 1992; M.Bleckmann: Diplomarbeit, Aachen 1993.

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