1 Brooks, R.C., 1991, Journal for the History of Astronomy, 22, 127.

2 Greaney, M.P., 1993, Webb Society Quarterly Journal, 94,

3 Alzner, A. ( dsretel.html)

The RETEL micrometer is available from Retel ElectroMechanical Design Limited, 37 Banbury Road, Nuffield Industrial Estate, Poole, Dorset, BH17 0GA, UK. Contact Mr L. Reynolds - Tel: (01202) 685883; Fax: (01202) 684648.

The van Slyke Engineering Filar micrometer is still available on special order - see turret.htm

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Chapter 16

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