Makeba Kombinator pencil & slide rule Rare Carbic-made Fischer Calculator For calculating in Twaddells !! PTT rule for Cable Radio (Signal Loss/dB) Smallest drum (≈ 2.4m) made by LOGA F-C Laukhuff Organ Pipes/System-Rensch

A man must have a hobby ....

This non-commercial website was a 60th birthday present from Ros. The name stems from another family member - our daughter Siân. As a teenager she often told her friends: “Oh, he collects expensive sticks of wood!”

When the latest PC/tablet is out-of-date in 6 months it may come as a surprise that the Englishman in the image, the Rev. William Oughtred (1575-1660), invented a calculator around 1621 that would be in continual daily use for nigh on the next 400 years. My hobby is collecting and writing about this analogue calculating wonder - the SLIDE RULE.
This site is a “display cabinet” for my collection (as it gets uploaded) and a “bookshelf” for my stories - enjoy browsing.

News - So far 579 rules are loaded from my collection

02 November 2016

NEWLY LOADED – the highlights

Added in recent weeks: (i) latest two articles to be published, (ii) a rare hybrid model, (iii) a “lost” Bakelite model and (iv) an unusual large circular model for typography.

28 October 2016

Have I Got News For You!

The UKSRC Slide Rule Gazette was the guest publication on British television’s highly acclaimed weekly satirical comical news quizz HIGNFY - see the You Tube clip.

21 September 2016

IM2016 - “Splendido!”

The International Meeting in Trento, Italy was memorable - download the Papers or watch the presentations.

Next year the IM2017 will be in Germany.

Bis September in Bonn.

10 April 2016


Colin Barnes, an authority on slide rules & all things technical passed away on 08/04/2016 after a short illness. The “founding father” of the UK collectors group was also a remarkable man.

22 January 2016


Anton Wolfgang Graf von Faber-Castell died yesterday. He was the 8th generation to run the world famous company. His son, Charles, joined the business in 2013. So the dynasty may continue ...

07 February 2014


Site totally revamped/restyled to take advantage of modern design features & navigation aids.

Please tell me what you think ....

Latest additions

Slide Rules

Nestler, 0215, Desktop Darmstadt 360°, L, Closed frame, wood/celluloid veneers

Tech Papers

Wrong Way Up !

Gazette Colin Barnes Memorial Issue 2016

The history - How it all began ....

To learn more about the history of this remarkable calculating wonder check out the Oughtred SocietySlide Rule History” or my 2-page summary (in Dutch!).

Anyone needing a “memory jogger” or is just intrigued how such analogue calculators of the past worked, the International Slide Rule Museum has a richly illustrated “How to use …” guide. After that try doing a few trial calculations with Derek Ross’ online simulation of a Pickett N909-ES slide rule.

Educators looking for related inspiration & teaching aids/material need look no further than Nicola Marras’ website. But if just looking for reference books try one of these: MyList 1 or MyList 2 .

My wish list

Sought after slide rules still missing from the collection:

A.W. Faber-Castell4/60, 4/92, 8/13, 8/14, 8/15 and 8/168
Dargue Brothers Ltd / SimplonSimplon SD10 Duplex
Engineering Instruments Inc.Either “vinylite” circular models
Fearns CalculatorsBarber Shop Harmony Calculator
Festus Mfg. Co. / Acu-Rule Mfg. Co.100
InglisFLASH: Pricing, Photographic Exposure, Stock Exchange, Foreign Money, Paper Trades & Health Insurance
IWA15489 Harmonik
L&C Hardtmuth / ClassicPoclet 5" Series II & III
Lawrence Engineering ServicesS-M (C.V. Ore) & Exposure (MIT)
NestlerCursor (runner) for 342 (50cm) & 24b (100cm)
Slide Rule and Scale Engineering Co.- any -