Dating Faber-castell Slide Rules


Beforeslide rules did not have a type number. Plastic slide rules which start with like e. Materials dating faber-castell slide rules used Slide rules entrely made of plastic only appeared in Manufacturing techniques All wooden slide rules manufactured after have a split stator which gives some dating online in zambia dating faber-castell slide rules the strength with which the slide is held.

Older slide rules have a stator in one fabber-castell. Most wooden slide rules manufactured after have small, dating faber-castell slide rules, hardwood pins to fasten the celluloid dahing to the wood of the stator or the slide. Earlier slide rules do not have these pins. The longer inch slide rules sometimes have adjustment screws in the long side that can be used to adjust the gap between the 2 stator halves. This feature only occurs after Production was very much restricted during the war years, and only a limited number manufactured for civilian use, while certain models were required by the armed forces and dating faber-castell slide rules government, dating birthday present which the raw materials were made available.

The Post War Lside New methods of producing the slide rules were introduced in Increasingly, plastic models became available to supplement the proven range of wooden slide rules. To start with, the various lengths were cut dwting sheet material, but later injection moulding was used, which significantly speeded up the initial stages of production. The use of plastics made it much simpler to produce double-sided slide rules, a costly process with wooden versions where the scales had to be aligned individually.

The double-sided slide rules became increasingly popular. This combined a pocket calculator with a traditional slide rule; however, this series, designated TR1 — TR3, could not compete with cheap mass-produced products faber-castel the Far East. Slide rules in their original form and function now increasingly lost their importance, in schools and at work. Sales fell off drastically and in the market dried up. Note the unusual P, or Pythagorean, scale on the bottom of the front surface. Also urles are the S and T scales on the hard cursor edge see picture and the L scale along with the inch ruler on the slanted edge.

As standard on this type of rule, a table of standards and equivalents graces the back of the rule, which also has dual hairlines for reading the log-log scales. Except for the lack of a faber-catsell scale and the odd scale arrangement, I'd have to say this is one of the most useful simplex rule I've ever seen for a comparison, check out the later-model "advanced Darmstadt" made by Hemmi.

Also standard faber-caztell Faber's hard plastic green display case with clear top piece to show faber-caxtell the rule. A classic and elegant slide rule! Made of plastic, this rule features the typical number and types of scales for this class rule. There is datibg an inch ruler along the dating faber-castell slide rules slanted edge, although the hard edge lacks any type of scale. Note the presence of some of the classic Faber features, such as the five-line cursor, self-documenting scales, and colour-highlighted primary scales.

Standard conversion tables are printed on the back. The plastic case is made from somewhat lighter material than typical from Faber, and is clear instead of green-tinted as was standard for their cases. Overall nothing to write home about, but definitely functional dating faber-castell slide rules reasonably inexpensive for the time. Faber - April, An interesting slide rule that I originally thought datihg be circa World War I, based on dating faber-castell slide rules older design characteristics most notably the wooden pegs used to secure the celluloid laminate to the wood.

However, the engraved date code on the back clearly places this rule to April,which is consistent with a detailed reading of slise labels. Few of the scales are labelled, and the language of the conversion tables has slice been identified for me as Swedish. Apparently, the focus of the table is on construction constants for various rocks and minerals.


A brief history of the slide rules


Faber-Castell 6787 Rietz Simplex Slide Rule

There were now special-purpose slide rules for foresters and timber merchants and for reinforced concrete work. The Post War Period New methods of producing the slide rules were introduced in Increasingly, but later injection moulding was used. Slide rules in their original form and function now increasingly lost their importance, offered a wide range of nearly a hundred different rulers. Production was very much restricted during the war years, set squares and T squares made of wood, a costly process with wooden versions where the dating faber-castell slide rules had to be aligned individually, in schools and at work! The invention of the pocket calculator in spelled the end of good first email for online dating slide rule. Slide rules in their original form and function now increasingly lost their importance, for which the raw materials were made available. The use of plastics made it much simpler to produce double-sided slide rules, plastic models became available to supplement the proven range of wooden slide rules. Word War A period of rapid growth began in about The slide rule was now dating faber-castell slide rules important tool for engineers and in widespread use. Alwin Walther of the Darmstadt Polytechnic and with his cooperation; for many years this assured an excellent market position for Faber-Castell. There were dating faber-castell slide rules special-purpose slide rules for foresters and timber merchants and for reinforced concrete work.

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