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  • ARISTO 90107 specially commissioned model for calculating the lifespan of filament lightbulbs
  • Koch, Huxhold & Hannemann (KHH) - made the surprising System Korte slide rule that does addition & subtraction
  • Smallwood Folding Shoe Sizing Stick in metric for French shoe sizes 10-48 in increments of a Paris point (⅔ cm)
  • Lawrence MIT Antenna slide rule for radar antenna performance was classified during WWII by UK & US governments
  • ALRO-made ruler unusually with a cursor for analysing ECG printouts of the cardiac Sinus Rhythms
  • Hatters Gauge - for measuring the size of a hat but unusually calibrated in metric & imperial
  • Glovers Rule - for measuring the length of a glove in imperial inches
  • Unusual non-logarithmic QR 41 military model by Dennert & Pape (D&P) for training anti-aircraft gunners
  • Colour combinations slide rule made by German WH-Wohnen for Interior Designers
  • Professor Fuller’s Drum Calculator from 1878 - made by W.F. Stanley
  • Modern wristwatch with slide rule bezel calculator made by German maker Kienzle
  • Ruxton made Multi-Vider combined drop-lead pencil & slide rule
  • Rare Otis King Model N for Retail & Monetary with white scales (422 & 424) on a black background
  • Darnley’s Rotable Lightning Calculator/Pencil Case calculating aid
  • Makeba made Kombinator combination pencil & slide rule
  • Rare Carbic-made Fischer Calculator slide rule
  • Specialist slide rule for a national home cable radio broadcasting system offered in The Netherlands from 1930 to1970
  • Smallest drum (≈ 2.4m) made by renowned Swiss maker LOGA

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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.
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Search results: Click on any Model listed in the leftmost column (or its image) for the full specification OR hover over its "Thumbnail" image (if shown) for a pop-up enlargement

You searched for: DIWA (Dansk Industri Waterpas A/S )
ModelTypeMaterialCommentsThumbnail
1-1 Rietz-Ideal Rietz plastic

Called Ideal  because full complement of Trig scales included on front face

101 Log Log Log-Log wood/celluloid veneers

Veneers attached with screws/pins + table of conversion factors on back with 1 cursor window

DIWA 101 Log Log Log-Log
201 Technical (ver.1) Rietz wood/celluloid veneers

Veneers attached with screws/pins + table of conversion factors on back with 1 cursor window

201 Technical (ver.2) Rietz wood/celluloid veneers

Veneers attached with screws/pins + table of conversion factors on back with 1 cursor window

301 Commercial Enhanced Mannheim wood/celluloid veneers

With veneers attached with screws/pins earlier precursor to plastic 301 Rietz + table of conversion factors on back with 2 cursor windows

301 Rietz Rietz wood/plastic veneers

Table of conversion factors on back with 1 cursor window

361 Log Log Log-Log wood/celluloid veneers

Extra wide + Table of conversion factors on back

501 Rietz Rietz plastic

1 cursor window in back

551 Darmstadt Darmstadt plastic

Unusual layout for Darmstadt

DIWA 551 Darmstadt Darmstadt
601 Pocket Promotional Rietz plastic

Version of 621 but primarily a model for a promotional slide rule - in this case for Danish supplier of light-weight concrete SIPOREX + company details on back with 1 cursor window

601-1 Pocket Rietz plastic

Later version of 601 + 1 cursor window in back

611 Pocket Electro plastic

V and W scales in the well of the stock + 1 cursor window in back

DIWA 611 Pocket Electro
621 Technical Pocket Rietz plastic

1 cursor window in back

631 Commercial Pocket Enhanced Mannheim plastic

Specially commissioned by Swedish company Elektromekano & printed on back + 1 cursor window in back

701 Rietz Rietz plastic

A “cheaper” model (all scales on front face) for schools + inch scale “upside down”

DIWA 701 Rietz Rietz
710 Teknilog Technical plastic

Impressive complement of scales but possible OEM by Japanese maker Ushida Yoko

DIWA 710 Teknilog Technical
741 Businessman Export Technical two-tone plastic

From construction, two-tone nature, scale layout, & cm + inch scale on back OEM by Japanese maker Ushida Yoko

DIWA 741 Businessman Export Technical two-tone