Dating faber castell slide rules

I have only a few rules from after the model numbering changed, my largest and most advanced is a 344/83 Novo-Duplex demonstration rule for a 2/83 from 1964, and my youngest is a 1970-75 310/88,89 OHP demonstration rule.The Click on model number to go to model page with detailed descriptions, comparisons and photo gallery of all examples of a model, or click description to jump down to model within context by type and scale length on this page.My second slide rule was an A W Faber-Castell 1/92 Log Log (195? I was immediately impressed with its quality of craftsmanship and 'feel'.In need of a direction in this new interest, I found out a little more about Faber-Castell's slide rules and their history, and decided to focus on them as a manufacturer. Faber Calculating Rule has usually been made of well-seasoned boxwood.The first Faber-Castell slide rule was produced in 1892.As I am interested in 'old things' and their developement, I narrowed my focus on Fabers to from their earliest models in the 1890's, through their model range explosion, up to when they first changed their model numbering system around 1935 - their formative years.

Faber - the name was changed to Faber-Castell in 1906 (see P.

350 made of box wood with the “Mannheim” scales and a glass cursor, and below it No.

360, also made of box wood but with celluloid scales. A later catalogue, dated 1912, offered a wide range of nearly a hundred different rulers, set squares and T squares made of wood, and then 20 models of slide rule of high quality and precision, made of pear wood (ideally suited to the task) with celluloid scales.

I have most of the more common models from my period of interest, but actually less than half of the variants made.

My earliest rules are unlabelled models 350 and 360 from around 1895-99, followed by several examples of models from the period up to the start of the First World War when there was a lot of experimentaton and advances in construction.

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I have a fond affection for slide ruleswhen studying the sciences at high school and college in the early 70s onwards, they were still a common tool before their rapid demise in the mid 70s when electronic calculators became affordable for all.

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