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Dating pickett slide rules
Pickett N4-ES This rule uses extended scales, i. The party when closed does not draft beyond the edges of the even. This is the only odd model of the four shown, i. Site Thornton AD Club:.
As you can see on the high resolution scans, this particular rule is little worn in places, but still functional. Standard duplex slide rules are redesigned as the new datings pickett slide rules,andaimed at the US market. Shown complete in factory box with leather case, "How to use Log Log Slide Rules" instruction manual. Jay Kelly Wright, who owned this slide rule 2 of 2was born in Washington D. Aluminum Stock ,Square Braces, extended nylon cursor bars, flat lens. Owned by Paul Roller Michaelis Ph. Pickett Model 4 InDanforth W. One new Hemmi D in two-piece pasteboard case. Some rules with metal springs if not perfectly adjusted can give too much tension giving a stiff slide, especially when cursor is near rule centre.
The size and modest number of most likely used scales combined with British Thornton's reputation for precision also visually give the impression of a very crisp easy to read rule, more so I think than the 'busy' Faber above. This Dating pickett slide rules made rule is the original bought in my teens when studying the sciences at high school. Slide rules weren't mandatory, log tables were more commonly used, but some of my fellow students and I did use them, particularly for physics and chemistry, where the three significant figures was more than sufficient.
At the time, a choice of slide rules were still commonly sold in any high street stationers such as W H Smiths and Boots the Chemist the latter who had their own branded range. I unknowingly purchased a model which, although now joined with ten more in recent years, I still feel is hard to beat. The use of brackets only on the rear face gives a clean uncluttered look but are rather fragile if droppedthe plastic is whiter than most giving high contrast scales, the pastel blue of the slide and a comprehensive but not overwhelming range of scales gives what I think is an elegant and easy to use 'sports car' of slide rules.
Detail of the Sun Hemmi P The scale codes presented on the left were standardised across makers. The simplest rule may just have the A, B, C and D scales and probably the Cl for multiplication and division. This is an example of a 'self indicating' rule because the function of each scale is given on the right; not all rules featured this. The slide when closed does not extend beyond the edges of the stock. Some makers extended the slide e. Unique or indented the stock, e. British Thornton to allow more precise control, especially when slide was nearly closed. Functions such as squares, square roots, cubes, cube roots and trig values can be read off for a value of x by just using the cursor.
Exponential or log log scales are on the reverse of the slide. Size 31 x 4. Pickett were one of the main US makers and whose later models made extensive use of aluminium to give a lightweight but rigid rule. The 'ES' in the model name denotes their 'Eye Saver' yellow finish nmthe benefits of increased visual acuity of scales and reduced eye strain are described in the accompanying leaflet. Models were typically available both in traditional white or the yellow. I've only bought two NIB models. I prefer to acquire the well used but still fully functional models preferably with its box and manual albeit likely tatty where they can often attract barely a few pounds.
The earlier rules engraved or stamped the scales on the wood I don't possess an example ; the examples shown adopt a variety of scale manufacturing methods using celluloid attached to the stock. Even for the cheapest school rules, precision scales were of course vital to be of use. The first two were made by the British company Unique based in Brighton. The first is the 'Brighton' model with mahogany stock, the most sophisticated they made; the second is their basic 'Log Log' model. The third is a Hemmi which I bought partly because it was an example of their use of bamboo, a self lubricating material. The end sections have a very distinctive look of bamboo and is my prize possession for a reason I'll return to later.
Unlike the Unique models, both the Hemmi and Castell use engraved scales on the celluloid itself bonded to the stock. Unique Log Log, Unique Brighton.
The first three from left to right Dating pickett slide rules simplex rules, they only have scales on the front face and the cursor designs reflects this. The Hemmi far right is a duplex with a bamboo stock with the distinct texture seen in end view. Others used end brackets without a base like the Hemmi, an example of an 'open rule'. The first three have so-called 'railway track scales', a feature I like as keeps each scale distinct on a busy rule and can aid reading off values. It's not a design seen on most later rules, possibly because of the added complexity of manufacture if engraved scales rather than printed.
Reiss pocket model, plastic with Cylindrical and circular rules - three examples The slide rules illustrated so far are linear with typical 25 cm or 10 Dating pickett slide rules scales. For greater precision, models pickwtt linear scales of 50 cm picket more were available Dzting they can start to become impractical. Models were typically available both in traditional white or the yellow. Blank Gift Of Edward T. A beautiful bamboo duplex rule. He was a recreational pilot and remembers needing to have a slide rule in order to obain his pilot's license. Black sewed naugahyde sleeve. Narrow nylon cursor blocks. Mr Huang, who prefers to remain anonymous, obtained a B.
After the war, he obtained his high school degree and went on to Case Institute in Cleveland studying mechanical engineering. Has 3 extra scales over the base model, including the double square scales.