Juggler's Slide Rules

"SYSTEM TOMBEUR"

Image Although casually interested in maths and physics, I didn't properly explore this side of juggling until I discovered slide rules.

Immediately I thought that juggling mechanics would be a great application for a slide rule and, having satisfied myself it hadn't been done, decided to design and build one.

After a few months of research and experimentation, by the end of 2011 I ended up with two versions of "Juggling Slide Rules"; a "Simple" one and a "Complex" or advanced one.

Both versions can be used for easy calculation and comparison of heights and throw rates for different throw weights. The advanced version allows different hold times to be included in the calculations/comparisons, has extra scales for easier comparisons and calculation of throw angle and velocity and general calculation.

There is a PDF guide for the two original rules with background, some theory, full instructions with examples and scales for printing, which can be found in the documents list below. *** THIS GUIDE IS IN THE PROCESS OF BEING RE-WRITEN TO INCLUDE THE SUBSEQUENT DEVELOPMENT OF THE RULES***

As a result of interest from the slide rule community, including a short presentation at the 2012 International Meeting of Slide Rule Collectors, I have rationalized these first two rules to make them easier to use with more conventional layouts. The rules have been re-branded "Juggler's Slide Rules", with the specialist juggling scales design and layout incorporating standard slide rule scales called "System Tombeur", in true slide rule tradition.

The "Simple" rule has become the "S" or Simple series with 2 models; a full size version, the S2, and a pocket version, the "S3". The "Complex" has become the "A" or Advanced series with one model, the A2. Full instructions including theory, examples and care information are available for both model series, see the documents list below.

There are now several S2, S3 and A2 rules scattered around the globe, if interested, please contact me via the email address in the Contact page.
Models Summary
The table below is a complete list of all models ever made. Multiple entries within a model number indicates multiple versions/examples. Click on a model to jump down to its description:

Brand Model No Description Material¹ Scale 
mm 
(Top Face Length x Width mm) Year  (years
produced)
Juggler's Slide Rule A2 System Tombeur, advanced   W/X 244  (282 x 46) 2012 
& 2013 
(2012- )
Juggler's Slide Rule S2 System Tombeur, basic   W/X 244  (268 x 36) 2012  (2012- )
Juggler's Slide Rule S3 System Tombeur, pocket basic   W/X 130  (146 x 30) 2012  (2012- )
Juggling Slide Rule Simple Basic (superceded by S2)   W/X 244  (270 x 36) 2011  (2011)
Juggling Slide Rule Complex Advanced (superceded by A2)   W/X 244  (282 x 46) 2011  (2011)

¹ A = Aluminium; C = celluloid; L = painted; P = plastic; W = wood; X = Perspex
Documents
All documents are A4 size PDF, with the instructions formatted to be printed as an A5 booklet from Acrobat (using the booket printing option in the print dialog). Click to open the PDF or link:

Models by Type
System Tombeur (Juggling mechanics)
Click model header to go to model page with detailed descriptions, comparisons and photo gallery,
or click image to go to version on that page.
13cm Scale Length (Pocket rule)
Click model header to go to model page with detailed descriptions, comparisons and photo gallery,
or click image to go to version on that page.
Prototype (Juggling mechanics)
Click model header to go to model page with detailed descriptions, comparisons and photo gallery,
or click image to go to version on that page.
Count Belmiro © Copyright December 2011 - July 2015
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