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Welcome To The Sphere Research Slide Rule Learning Center!
Slide rule information, factory manuals, lessons, care and restoration data
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3394 Sunnyside Rd.
West Kelowna, BC, Canada V1Z 2V4
Phone: +1 (250) 769-1834
FAX:+1 (250) 769-4106

A great source for test equipment, repairs, calibrations, useful metrology information, and of course, SLIDE RULES!

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The Slide Rule Universe
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The Slide Rule Marketplace

MARKETPLACE
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Slide Rule Marketplace

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Learning about Slide Rules

Lesson Info

We have original factory lessons and manuals from several manufacturers to help you understand your slide rule. These explain special features and scales on some rules, but are often good for any mechanically similar or related company rule. Some lessons are quite old (as far back as 1929, so far), and are all the more amazing for their relevance today.


CLICK to visit the 1929 KE Lesson

The famous 'A teaching guide for slide rule instruction' by Maurice L. Hartung, (University of Chicago), Copyright 1960 by Pickett and Eckel, Inc. is also reproduced here. Learn how to properly teach slide rule operation from Pickett's perspective. This booklet is 40 years old, but still very topical and relevant. This booklet was supplied free to instructors, and is reproduced here exactly as it appeared in 1960 (except that the original pages were YELLOW). We believe this document is now in the public domain (over 40 years from the date of the corporate copyright date), and was free in any case, but if we are incorrect, please advise, and we will remove it immediately. A really excellent reference, and great if you are either learning or teaching the slide rule.

Hey, wait a minute!
Tell me some general info! Tell me some basic information and slide rule terms first so I can at least get started!


Why does it work?
Explain it to me! Here's how and why a slide rule works so you understand the math and science behind it.

We also have some illustrated guides for cleaning and maintaining your rules, and step by step instructions on how to restore a rule that has clearly seen better days. If you are feeling brave, give it a try!

CLICK to CLEAN that RULE!

CLICK to learn how to care for your slide rule from K+E


You can also find out all kinds of interesting general information like how rules get FOUND, what everybody's FAVORITES are and what the various rule SCALES are used for.

CLICK to go Searching for Rules!



Learning How to Operate a Slide Rule
Original
Company Manuals
K+E Manuals K+E original instruction manuals and brochures that came with their rules.
CLICK to visit the KE Lesson
Elementary
Instructions
for Operating
a Slide Rule


Learn How to Operate a Slide Rule with a 1928 K+E Lesson
CLICK to go on the K+E Tour!
How to Choose
a Slide Rule


An amazing tour with K+E
from 1940 about selecting a rule.
POST HEMMI POST and Hemmi original instruction manuals and brochures that came with their rules.
CLICK to visit the POST Mannheim Lesson
POST
Mannheim
Slide Rule Lesson


covers simple POST
and Hemmi rules
Learn all about Hemmi slide rules, take the 257 Chemical Rule Lesson
HEMMI
257 Chemical
Rule Manual


The complete manual
with illustrations,
covers many duplex rules
CLICK to visit the Pickett Archive Pickett original instruction manuals and brochures that came with their rules.
Click to visit the Pickett Teaching Lesson!'A teaching guide for slide rule instruction' by Maurice L. Hartung
Learn How to Teach or Operate a Slide Rule with a 1960 Pickett Teacher's Lesson, covers all rules (.PDF file) Requires Adobe Acrobat Reader. Or, grab them all as one big 1.37Mb ZIP file of page GIFs and view them locally.
Circular
Rules
CLICK for Faber-Castell circular rule instructions
Learn How to operate your Faber-Castell 8/10 circular slide rule right from the maker.

Original circular rule data as we find it.
CLICK for Fowler Jubilee Magnum circular rule instructions
Learn How to operate your Fowler Jubilee Magnum Circular Slide Rule right from the maker.

Original 1948 circular rule data as we find it, this is courtesy of Manfred Hausmann.
CLICK for Fowler  Magnum circular rule instructionsLearn How to operate your Fowler Magnum Circular Slide Rule right from the maker. Original circular rule data as we find it, this is courtesy of Dave Thompson and Giuseppe Bianchi.
CLICK for Fowler Universal circular rule instructions
Learn How to operate your Fowler Universal Circular Slide Rule right from the maker.

Original circular rule data as we find it, this is courtesy of Tina Cordon.
CLICK for Gilson circular rule instructions
Learn How to operate your Gilson Atlas/Binary circular slide rule right from the maker.

Original circular rule data as we find it.
General
Information

CLICK to visit the SCALES page
Slide Rule
SCALES
& their meaning.
The Data-Guide SLIDE RULE GUIDE ((C) 1956)
CLICK for Hi-Res JPG
Slide Rule Guide Page 1, CLICK for bigger PIC!
Slide Rule Guide Page 1, CLICK for bigger PIC!

Covers set up and use of all rule functions
from multiplication and division to roots and logs
. A wonderful and concise set of directions from almost 50 years ago!
CLICK for Hi-Res JPG
Slide Rule Guide Page 2, CLICK for bigger PIC!
Slide Rule Guide Page 2, CLICK for bigger PIC!

Covers set up and use of all rule functions
from multiplication and division to roots and logs.
A wonderful and concise set of directions from almost 50 years ago!

Great Manual Sources on the Net
Didn't find what you wanted in this list? Try Greg's site here for more digitized slide rule manuals at OZMANOR! Contributors from all over the net have provided manual scans for your reference, a great resource. OZMANOR
DOWNLOADABLE
MANUALS

Click to visit!
Looking for hard to find European manuals and instructions? Visit Tina's Slide Rule Books and other Good Stuff. A rich and varied resource. CLICK to Visit!
Tina's Slide Rule Books
and Other Good Stuff

Cleaning and Adjusting a Slide Rule
Factory
Information
CLICK to learn how to care for your slide rule
Learn How to take care of your slide rule right from K+E, Dietzgen, etc.
Practical
Information
CLICK to CLEAN that RULE!
CLICK to CLEAN that RULE!How to CLEAN
and CARE FOR
your Slide Rule!
CLICK to visit the PARTS EXCHANGE
Our Spare Parts Exchange

Get parts to fix that sad looking rule, donate parts for others.
CLICK to Read the article!Accuracy
vs.
Precision

A detailed explanation, just updated.

General
Information
CLICK to visit the BOOK reviews
Visit Our Library & Book Reviews

See what books are out there for slide rules, and what they are like.
CLICK to go Searching for Rules!
Learn How Rules Get Found


A detailed explanation of the whole mysterious process from Foo in Singapore
See Numero UnoNUMERO UNO
The Sept. 1999 survey of everybody's FAVORITE slide rule
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.
Outside
Information
OughtredJoin the Oughtred Society
A non-profit association for slide rule collectors
CLICK to visit our LINKSVisit our LINKS to Other Places
Now includes the link to the Moonstick!

Places to go in the Slide Rule Universe, people to see....
CLICK to visit the Slide Rule Marketplace
Click to visit!
CLICK HEREBuy 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 the Slide Rule Archives!
Click to visit!
CLICK HERETour our extensive archives of slide rule manufacturers and models from all over the world. Find out who made what, and what became of them after they stopped making slide rules. See how slide rules survive today in the form of slide charts still made in the millions annually.
CLICK to visit our LINKS
Click to visit!
CLICK HEREVisit 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.
CLICK to visit the Marketplace
Click to visit!
CLICK HERENice things people have said about us in print and on TV, see the original articles. We always appreciate it!
CLICK to visit the Test Equipment Site!
Click to visit!
CLICK HEREVisit our TEST EQUIPMENT site everything from Scopes, CRT's and DMM's to nixie tubes, HP and Tektronix spare parts. A little electronic something for everybody.
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