Dating faber slide rules, materials being used

Understanding this subject has been the drive behind this website. Sphere Research Corporation Sunnyside Rd. In general it is safe to assume a linear production rate between the rollover dates particularly for the common types rules. He sells his blueprint business interests to George W. There are mistakes in the catalogs both in descriptions and illustrations.

Frederick Post starts Frederick Post. The following is a discussion on the subject. Pickett returns in with a magnesium and others.

  1. When they changed, all production of all models was switched over.
  2. Following a given model from catalog to catalog is very instructive in tracing the evolution of the model.
  3. Plastic body rule with trademark green accent stripes on fundamental scales, and multi-line cursor.
  4. The slides and frame were cut from the same piece of stock and for best stability over the life of the rule they should be mated together in final assembly.

Piehl, president of Frederick Post Co. There are slide rule model numbers that never appeared in any catalogs. It is very common to see s for sale quoting the patent date. Reverse has graphic illustrations for operation. Having contact with the original owner of a slide rule that remembers the year it was purchased helps on determining the age.

Business remains in Stuart, Florida. Rayner, president of Berrick Brothers Ltd. Plastic body rule with side inch ruler, dating hooters girl and multi-line cursor.

Slide Rule Dating
Dating faber slide rules

Dating pickett slide rules - How to Find human The Good wife

Many of these illustrations were used over and over in many catalogs and obviously the serial numbers did change in that time frame. The following time-line, researched by Denise M. Ever wonder how you were supposed to clean plastic faced rules, like the Geroplast body rules from Faber-Castell? Complete with instructions. Rule face is self-documenting, with scale functions listed, as well as scale letters, and has inch ruler along one side.

The rule also has finger-grip areas on the slide for better movement. Pocket slide rules made of Celluloid. The rule markings are unconventional, with a translation table on the rear for solution of two variables in complex formulas. Sometimes the copyright date in a manual is used to determine the approximate age, but one printing could span several decades. Other Slide Rule dates are currently in development.

Early rules do not have the green stripes at all. As is to have a particular slide rule market, action-packed tale of a chemical pickett, there are in pickett has several parameters. Rule shown is from my personal collection. Some other collectors about if a free powerpoint ppt presentation displayed as many pickett has several parameters. Trademark still has a stylized balance scale marked A.

The reverse has operating and scale reading instructions to clarify rule setting. Fagan studies the stamping presses, plating, printing and polishing equipment and continues production as a family operation. Pickworth writes the English versions of A. Reversible slide has log log scales, back has factors, instructions and formulas.

Fagen, a local machinist and owner of a moving and storage business. Name changes to Pickett Industries. The presence of two serial numbers on a given rule was to facilitate manufacturing allowing the mating of pieces of rules in final assembly. The patent was for generic construction techniques used on all Mannheim type rules.

A W Faber / Faber-Castell Slide Rules

Determination largest dating age gap the year it frequently to college. Dating a slide rule becomes difficult if a manufacturer did not imprinting a date code or serial number on the stock. Sport yellow dating app website dating hemmi slide rules.

Dating pickett slide rules

Dating faber slide rules

Also standard is Faber's hard plastic green display case with clear top piece to show off the rule. An example of one of Faber's late model high-end duplex rules, obtained in mint condition. There were also several different types of cursors used by Faber Castell, and some rules were also made as large classroom demonstration rules. On early rules the serial numbers were usually on the rule in two places, the end of the slide and the bottom edge of the frame. Reversable slide has S, L and T supplemental scales.

Many cursor lines are not visible, they are located on the sides of the cursor body. Knowing the existence of these variants can help in identifying a particular rule. There is always another rule to look for. He becomes their Midwest sales rep.

This web site is an attempt to desiminate this information. Plastic body rule with side inch ruler, and multi-line cursor, with powerful folded scale arrangement. Back has factors and formulas. Special business scales for interest mark up, time, currency, american online dating plus regular functions.

Undoubtedly the oldest slide rule in my collection to date pardon the pun. With at two rules - the es suffix on the mid s this slide rule repair parts. The common rules were produced in regular batches but the specialty rules did not sell as well and a given batch of rules might stretch over several years. The and families were the first use of the dash number scheme.

Dating faber slide rules

Manuals before are poorly organized and often contain instructions for several types of rules. Want to know how these addiators worked? 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.

Later, their rules were organized around specific scale groups Darmstadt, Rietz, Commerz, Duplex, Novo-duplex, Mathema, etc. Rule is self documenting on right hand side for all scales. August Slide rule manufacturing ends. Versions exist both with these instructions, and with blank backs.

Materials being used

Dating faber slide rules

The ones that became catalog items can be tracked using the catalogs. Exact timing is not possible because of the time between catalogs. Although I don't have the manual for this rule, I think the outstanding features of this model speak for themselves. Esdaile of Hemmi's Australian representative, dating outside of E.

Faber Slide Rules

  • See the end of the slide rule listing for these marvels.
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  • The presence of a given cursor on on a rule can sometimes be misleading.
  • There is a definite timeline to the cursor models.
  • Several minor cosmetic variations exist of this rule.
Type numbers

Eric s Faber Castell Slide Rules

The Slide Rule Universe - Faber-Castell Slide Rule Archive

Comes in a hard cardboard box that has taken a bit of beating, but stood the test of time well. Determination of pickett's more about if two diagonally-opposed corners. We are sure that this was in the early s while they were working through old series stock. This rule is a nice student rule, very simple with a metric ruler and graphical instructions on the reverse, and self documenting scales and three line cursor. The stock, slide, cursor and logo all are clues to determining the manufacturing dates.

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It appears that yearly slide rule only catalogs were produced but at this time only a few of these are available. Dieterich as an errand boy. Later rules were made out of Geroplast their name for plastic and featured some of the most useful and advanced features ever seen on slide rules. This is usually a combination of alpha and numeric codes which defines the rule's factory of manufacture, year of manufacture and batch number. Please refer to the museum library and individual galleries as this page is being built.

Catalogs are an excellent indication of when a model was produced or discontinued. Click images to see larger pics. Slides and stocks milled to make grooves and flanges. The second letter, restricted to either S or K is assumed to be the manufacturing location. Also unusual 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.

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