• 455 Martinson, Los Angeles
  • 8 (043) 567 - 89 - 30
  • support@email.com
  • Ruxton Multi-Vider drop-lead pencil & slide rule
  • Rare Otis King Model K - white scales on black background
  • Pocket Hexadecimal Slide Adder for Computer Programmers
  • Post 1824 Dring & Fage Alcohol Gauging Rule
  • Darnley’s Rotable Lightning Calculator/Pencil Case
  • Lawrence Antenna (classified by UK & US during WWII) for Radar Beam Pattern Detection
  • Makeba Kombinator pencil & slide rule
  • Rare Carbic-made Fischer Calculator
  • For Calculating Strength of Liquids in Twaddells !!
  • PTT rule for Cable Radio (Signal Loss/dB)
  • Smallest drum (≈ 2.4m) made by LOGA

Search my slide rule collection

Search by maker

Search by keyword

Tip: separate keywords (implict AND) by a space or a comma and if needed, limit the search by adding keywords proceeded by a hyphen: e.g. -Faber, -plastic. Phrases in quotes may also be used.

Search papers

Interested in finding out more out about such calculating wonders? Then try one of the slide rule related articles (often light-hearted) I have published.
Go to the search papers page.

Search results. Click on any listed Model for its full specification OR hover over its "Thumbnail" (if shown) for a pop-up enlargement

You searched for: Gebr. Wichmann
ModelTypeMaterialCommentsThumbnail
1418 R III Rietz wood/celluloid veneers

​OEM by Nestler - cm scale in well - table of constants on back + 2 cursor windows

1425 Enhanced Mannheim wood/celluloid veneers

OEM by Nestler - cm scale in well - table of constants on back + 2 cursor windows

1427 Rietz wood/celluloid veneers

OEM by Dennert & Pape - D&P + DRP No. 126499 in well of stock + conversion tables on back​ + 1 cursor window

431 Mannheim metal/cardboard

Model from the earliest known series​ - table of conversion factors on back

Gebr. Wichmann 431 Mannheim
4429 School Rietz wood/celluloid veneers

OEM by Faber - cm & inch scales on back + 2 cursor windows

4430 Pocket Enhanced Mannheim wood/celluloid veneers

OEM version made by Dennert & Pape + cm & reversed inch scale on back + 2 cursor windows

4477 Darmstadt wood/celluloid veneers

OEM by Faber-Castell - cm scale in well + 2 cursor windows in back

1919R Desktop Rietz wood/celluloid veneers

OEM by Nestler - cm scale in well of stock + hand-written list of formulas on back

Drieskalen Rietz wood/celluloid veneers

OEM by Nestler - table of constants on back + 2 cursor windows