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Magnetic wire selector in slide-rule format: "Datalator" for heavy synthetics made 1954 by Perrygraf

Magnetic wire selector in slide-rule format: "Datalator" for heavy synthetics made 1954 by Perrygraf

Wires for Pandora Box

Wires for Pandora Box

1920-1970
Magnetic wire selector in slide-rule format: "Datalator" for plain enamel wire made 1954 by Perrygraf

Magnetic wire selector in slide-rule format: "Datalator" for plain enamel wire made 1954 by Perrygraf

Conductor selector chart in slide-rule format

Conductor selector chart in slide-rule format

Miscellaneous flex and electrical fittings for the "Twin Equatorial" Telescope, 1885

Miscellaneous flex and electrical fittings

1885