These are rare dials at the best of times.
Right to Left : Click to enlarge (i) Equation Corrected Bifilar dial by Fred Sawyer & M.U. Zakariya - from  'Bifilar Gnomics' by (a very young) Frederick W, Sawyer III : Journal of the Brit. Astronomical Assoc 1978,88,4 (ii) Bifilar Dial - Sergio Garcia Doret - 2004 (iii) Chip-Carved Bifilar Dial - Roberto Rattotti - www.rknet.it
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