Slide
rules have come in different formats over the years. The most familiar is probably the 3part model with
a fixed outer frame and a sliding inner rod, and a sliding clear window with a reticle line etched into it for
aligning numbers (the cursor). While far from being any type of "collection," I do
have a couple nicely preserved models. The ones from Keufel & Esser (K&E)
are at the top of the table below. The Beginner's slide rule model is very basic with graduations on one side
and some conversions on the other. The best of all is the Pickett N600
ES LogLog that is in new condition and actually still has the box, leather case, instructions and certificate.
The Pickett N600 ES is the slide rule model that went to the moon with the Apollo astronauts
(not the one I own, of course).
Finally,
a few of the cardboard calculators I have are at the bottom. Probably only the VSWR Calculator from M/ACOM can
be considered collectible. My good friend Patrick Fitzgerald bestowed it upon me when I went to work for him at
General Electric right out of college. I can recall some of the older engineers still using slide rules there
when I arrived in the 1980s. In fact, the first algebra textbook I had in a community college right out of high
school in 1976 had a section in it on how to use a slide rule. The Sterling
684 plastic slide rule that I bought at the bookstore is show below. Shortly thereafter, the HP35 hit the
market and the world changed forever (now that was truly a disruptive technology).
April 2015 Update: Thanks to Gary Steinhour for donating three more cardboard calculators to the RF Cafe Museum:
The Ballentine Rule, EM Laboratories,
and the TelLaboratories Slide Rule.
◊ Here is the definitive source: International
Slide Rule Museum
 Slide Rule
Library Archive of books, manuals, instructions
and ephemera.

Instructions on how to use a slide rule.
◊
Or, try the Slide Rule Guy
◊ See the The Quick
and Easy "Lawrence" Slide Rule Instruction Book
◊ The Slide Rule Universe
 great resource
◊ Visit the Oughtred Society
(William Oughtred  inventor of the slide rule in 1622)
◊ Buy
newinthebox, mint condition slide
rules
◊ Virtual Slide Rules:
Standard slide rule
 EngCom.net, Pickett
slide rule  Antiquark.com
◊ Here is a website on
vintage instruments
(slide rules and other instruments of math, drafting, science, and music)
The RF Cafe Museum Slide Rule Collection
Cardboard Slide Rules
HP: Reflectometer & Mismatch Error Limits Calculator
Thanks to Joe Cahak for the donation
(copyright 1976)
AILTECH: Noise Slide Rule
Thanks to Joe Cahak for the donation
(copyright 1973)
Amphenol RF Division: Smith Chart Slide Rule
Thanks to Joe Cahak for the donation
Andrew: Heliax Slide Rule
Thanks to Joe Cahak for the donation
inmet: Gain Equalizer & Conversion Calculator
Thanks to Joe Cahak for the donation
(copyright 1999)
Concise: Chemical Element Slide Rule
Thanks to Joe Cahak for the donation
(copyright 1968)
Microwave Development Labs (MDL): Rigid Waveguide Data Calculator
Thanks to Joe Cahak for the donation
(copyright 1995)
Miteq: Mixer Spur Analyzer Calculator
Thanks to Joe Cahak for the donation
Rogers Corporation: High Frequency Substrate Selector
Thanks to Joe Cahak for the donation
(copyright 2010)
Roos instruments: RF & Reactance Calculator
Thanks to Joe Cahak for the donation
(copyright 1995)
Tektronix: Time Domain Reflectometer Slide Rule
Thanks to Joe Cahak for the donation
(copyright 1972)
Control Components: Valve Sizing Calculator
Thanks to Joe Birsa (N3TTE) for the donation
(copyright 1986)
Ohmart Corporation: Radiation Measurement Calculator
Thanks to Joe Birsa (N3TTE) for the donation
(copyright 1991)
Daniel Industries, Inc.: AirGas Orifice Flow Calculator
Thanks to Joe Birsa (N3TTE) for the donation
(copyright 1977)
The Ballentine Rule: dB <> Ratio Conversion  Volts <>
dB Power Level
Thanks to
Gary Steinhour for the donation
(copyright 1953)
EM Laboratories: U.S. ↔ Metric Conversions
Thanks to
Gary Steinhour for the donation
(copyright 1975)
TelInstrument Electronics Corp.: AC Power Slide Rule
Thanks to
Gary Steinhour for the donation
(copyright 1964)
FXR (now Microlab/FXR): Smith Chart Slide Rule
Smith Chart Side
Slide Rule Side
Thanks to
Gary Steinhour for the donation)
APN85 Pressure Reduction Computer
I. SeaLevel Reduction (left), II. Altimeter Setting (right)
These
were used by air traffic controllers back in the Stone Age This particular model was auctioned off when the
Bedrock Airport closed
Thanks to
Don Hicks for the donation
M/ACOM: VSWR Calculator
(copyright 1983)
Sage Wireline/Wirepac Calculator
Sage Wireline/Wirepac Calculator
(copyright 1992)
I have a spreadsheet available for the
Wireline Calculator.
GE Mobile Radio Range and Transmitter Power Calculator
GE Mobile Radio, Range and Transmitter Power Calculator
(copyright 1977)
Thanks to Alan Kealey for the donation!
Andrew Microwave Antenna System Computer
Andrew Microwave Antenna System Computer
(copyright 1994)
Classic Format Slide Rules
Pickett N600 ES LogLog Slide Rule
Pickett N600 ES LogLog Slide Rule
(this is the same model
that went to the moon w/the Apollo astronauts)
K&E Model N40803 Log Log Duplex Trig
K&E Model N40803 Log Log Duplex Trig, S/N 467192, Copyright 1947 Slide Rule
(wooden frame & bar w/metal ends)
K&E Model 40813 Slide Rule
K&E Model 40813 Slide Rule, S/N 087105
(wooden frame &
bar w/metal ends)
Sterling 684 White Plastic Slide Rule
Sterling 684 White Plastic Slide Rule
(I bought this for
my first algebra class in 1976)
Skala Wilcza 32 Wooden Slide Rule
Skala
Wilcza 32 Wooden Slide Rule (Poland)
Thanks to Alan Kealey for the donation!
Pickett N1010T Slide Rule
Pickett N1010T Slide Rule
(found in my fatherinlaw's basement)
Cleveland Institute 515T Slide Rule
Cleveland Institute 515T Slide Rule (made by Pickett)
Send
me an email
if you want a PDF file of a partial (10 pages) copy of the instruction manual.
[Buy the complete manual set
here]
This advertisement appeared in the August 1967 edition of Electronics World magazine. The unique
slide rule, leather case, and 4course instruction booklet was "...deliberately underpriced at less than $25."
K&E Beginner's Slide Rule
K&E Beginner's Slide Rule, Model 4058C
(allwood frame &
bar)
Lawrence Slide Rule Instruction Book
Lawrence Slide Rule Instruction Book
(copyright 1952)
Cleveland Institute of Electronics
Cleveland Institute of Electronics Slide Rule Product Feature
January 1965 Popular Science
Other Interesting Slide Rule Configurations
Gong Se He Ying
Metalworking calculator for Iron materials
Slide Rule Wallpaper
Slide Rule Wallpaper
Click on the image to open it in a
new window, then rightclick on it and choose Set as Background
Texas Magnum Slide Rule
Texas Magnum, World's Longest Slide Rule
(352 feet long, 300 pounds)
Soviet Slide Rule Watch
Soviet Slide Rule Watch
Projection Slide Rule
Projection Slide Rule