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  • Ruxton Multi-Vider drop-lead pencil & slide rule
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You searched for: differential
MakerModelTypeMaterialCommentsThumbnail
Thornton A.G. / P.I.C. / BritishBritish AD 050School Differential Log-Logplastic

Extra Thornton patented differential Trig scales ≡ to model P271 - superseded by model AD 150

Thornton A.G. / P.I.C. / BritishBritish P221Differential Comprehensive Log-Logplastic

Extra Thornton patented differential Trig scales & Vector analysis scales - superseded by model AA 010

Thornton A.G. / P.I.C. / BritishBritish P271School Differential Log-Logplastic

Extra Thornton patented differential Trig scales - superseded by model AD 050

Thornton A.G. / P.I.C. / BritishPIC 111/PC 8Differential Rietzwood/celluloid veneers

Rietz type without Trig scales but with extra Thornton patented differential Trig scales - conversion tables on back

Thornton A.G. / P.I.C. / BritishPIC 112Desktop Differential Rietzwood/celluloid veneers

Rietz type without Trig scales but with extra Thornton patented differential Trig scales - conversion tables on back - “big brother” version of PIC 111

Thornton A.G. / P.I.C. / BritishPIC 120Pocket Differential Log-Logwood/celluloid veneers

Extra Thornton patented differential Trig scales - “kid brother” version of PIC 121

Thornton A.G. / P.I.C. / BritishPIC 121/PC 18Differential Log-Logwood/celluloid veneers

Extra Thornton patented differential Trig scales & Vector analysis scale - conversion tables on back

Thornton A.G. / P.I.C. / BritishPIC 122Desktop Differential Log-Logwood/celluloid veneers

Extra Thornton patented differential Trig scales - conversion tables on back - “big brother” version of PIC 121

Thornton A.G. / P.I.C. / BritishPIC 131Differential Electrowood/celluloid veneers

Extra Thornton patented differential Trig scales - V & W scales in well of stock (metal well cursor) - conversion tables on back

Thornton A.G. / P.I.C. / BritishPIC 131/PC 18Differential Electrowood/celluloid veneers

Extra Thornton patented differential Trig scales & Vector analysis scale - V & W scales in well of stock (plastic well cursor) - conversion tables on back

Thornton A.G. / P.I.C. / BritishPIC 132Desktop Differential Electrowood/celluloid veneers

Extra Thornton patented differential Trig scales & Vector analysis scale - V & W scales in well of stock (plastic well cursor) - conversion tables on back - “big brother” version of PIC 131

Thornton A.G. / P.I.C. / BritishPIC 221Differential Comprehensive Log-Logplastic

Extra Thornton patented differential Trig scales & Vector analysis scales - superseded by models P221 & AA 010

Thornton A.G. / P.I.C. / BritishPIC 241Differential Log-Logplastic

Extra Thornton patented differential Trig scales - identical to model no. 271

Thornton A.G. / P.I.C. / BritishPIC 271School Differential Log-Logplastic

Made for Lennig Chemicals Ltd before relocating to Croydon, Surrey in 1968 - extra Thornton patented differential Trig scales - claim SR made from “high impact acrylic oroglas t”

Thornton A.G. / P.I.C. / BritishPIC VP114/PC 1Pocket Differential Rietzplastic

VP prefix = Vest Pocket - Rietz but patented (GB411090) differential Trig scales - cm scale on back