Sphere Research's Slide International Rule Archives

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Welcome To The Sphere Research Slide Rule Archives! Slide rule model information, pictures, and history from all over the world
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International Slide Rule Archives

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In these archives, you can find who made slide rules in every country in the world. This is a cross reference and link index to our existing maker's archives and reference files, organized by country, with short form data added on makers wo do not currently have in full illustrated archive format on line.

We have the most data on North American, Western European and Japanese manufacturers, and the least on Russian and Eastern European makers. We have NO data on any makers from South America or Africa, if they even exist. Any information you can add to the master index is greatly appreciated, and you can EMAIL WALTER HERE with updates, additions and corrections.

Some companies changed and evolved through different names and identities, these are generally grouped together into the main archive of the FINAL form. While some makers (Dietzgen, for example) used a few rules from Germany, they were principally an American manufacturer. POST primarily used rules from Hemmi in Japan, except for a brief WW2 period, and are more properly a slide rule distributor. Makers are shown in the country where they did most of their business, and manufacturing, although this sometimes becomes complex to determine. Suffice it to say, we have companies located in the their principal place of business, even if they were partially (or wholly) dependent on imported products. There are some interesting surprises and information hiding in the archives, and all of them are worth a quick visit when you have time.

Is the country of origin, trade name puzzle too confusing?
CLICK to see:
What's in a name?
Peek behind the trade name/ buzzword scenes in the slide rule business. A Rose by any other name is a Log Log Duplex Versalog, made by somebody else, and made 12,000 miles away!

International Slide Rule Archives	Linkable items have more data on the site.
	America/USA	Many makers used imported product for some or all of their production at different times.
	Visit the Dietzgen Company Archive
	Visit the Keuffel & Esser Company Archive	One of America's largest and best known slide rule manufacturers.
	Perrygraf American Slide Chart Now with VENDOR information to get new rules made!	Links to current suppliers, plus archive information.
	Visit the Pickett Company Archive	Another major American manufacturer, specialized in metal body rules (first magnesium, then aluminum).
	Visit the Frederick Post Co., Teledyne-Post Archive	Most rules were from Hemmi, but some from others as well during WW2 and early in the 1900's. Later became Teledyne-POST.
	Sterling	Relatively low end student rules.
	Australia
	Canada
	Hughes-Owens	See also POST and Hemmi archives, HO sold rebranded rules from Hemmi under their own part numbers.
	Geotec	Later incarnation of Hughes-Owens, See POST and Hemmi archives, sold rebranded rules from Hemmi under their own part numbers, different from HO part numbers.
	Czechoslovakia
	Logarex	Attractive and well made rules of all kinds, archive coming soon.
	China	Mainland China, does not include Taiwanese makers.
	Visit the Flying Fish Company Archive	China's state run manufacturer, many specialized rules for industry.
	Denmark
	Berger
	Diwa	Many DIWA rules were made as corporate products, often marked with their logos, especially pocket rules.
	England/UK
	Visit The Blundell-Harling Company Archive	Archive includes Blundell and Harling plus their later amalgamation.
	Otis King Plus other unusual rules	The Otis King rules are the best known and most common cylindrical rules.
	Thornton
	Unique
	France
	Visit the Graphoplex Company Archive	Graphoplex appears in the USA as Koh-i-noor. Broad product line, with export sales all over Europe and to the USA.
	Guedon
	Germany	Both East and West Germany are included here, and most companies predate partition.
	Visit The Aristo Company Archive	Includes Dennert and Pape in the archive.
	Dennert and Pape	See Aristo archive for details.
	Visit the Faber-Castell Company Archive	Includes A.W. Faber, Faber-Castell, etc. One of the largest makers in Europe. Supplied rules to other companies including Dietzgen in the USA for rebranding.
	Visit the Nestler Company Archive	One of Germany's oldest makers, their high quality rules were used by von Braun and Einstein, among others.
	Visit the Staedtler Mars Archive	SM distributed in many countries, and later manufactured in many countries, but most slide rules and the company originated in Germany.
	Italy
	Japan	Many products from Japanese makers re-appear world wide under other trade names, especially Hemmi.
	HEMMI Company Archives	Hemmi marked their rules with the SUN logo/tradename. Companies world wide sold Hemmi rules under their own trade marks, including POST, Hughes-Owens, etc.
	Ricoh
	Seiko Slide Rules You Wear Slide Rule Watches	Archive includes other watch makers with slide rules as well.
	Russia/USSR

Places to go in the Slide Rule Universe, people to see....

Click to visit!	Buy a slide rule from our extensive on line marketplace, with restored classics, amazing new in the box rules, and low cost first student rules. We have something for everybody, even a swap and sell area for visitors.
Click to visit!	Learn to operate and care for your slide rule with these on line manuals and directions. Learn what scales mean, how to use them and how to restore or keep your rule in good condition.
Click to visit!	Visit other slide rule places on the web with more slide rule data and information. From personal collections on line to (yes, it's really true) the international slide rule owners and collectors organization, the Oughtred Society.
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