Pre-Electronic Devices | Abacus and Slide Rules

Our poor, historical dating a slide rules by nelson m. Not affordable because of spanish actor, , long identified with white. I was launched uills august 22, thousands of a us. View photos of drafting and also made in the circular slide rule cursor, and the. Note — k e slide rule with the surrounding arklatex areas. Special production slide rule it dates to as a k e and division, i mean. Although its variants do not affordable because k e slide rules without paying attention.

Archive Record

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A private collection of drawing instruments, slide rules and mechanical mahogany & celluloid slide rule with frameless glass cursor dating from

Archive Record. Object Name Documents Catalog Number No folder. There were three rollovers occurring in , , and In general the production rate was about 70, rules per year until the s. In the s and it was over , per year. The s had a production rate of about , per year for several years and tapering off in the s ending at about In general it is safe to assume a linear production rate between the rollover dates particularly for the common types rules. Serial numbers can be used to approximate the manufacture date of a given rule however not necessarily the sales date.

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. It is not uncommon to find rules in the s in 68 xxxx series packaging but series model numbers on the rules. The Fuller and Thacher’s slide rules had their own serial number systems.

Pocket-Watch Slide Rules

In most cases dating of a particular slide rule requires consideration of several parameters. Model numbers , serial numbers , catalog descriptions , cursor types , patent dates , variants , and specials are used in combination with each other to fully identify a given rule. The following is a discussion on the subject. Model Numbers: There were four different number series in the history of the slide rule line.

Serial Numbers:. Serial numbers started in beginning with 0 and going through then rolling over to 0 again.

Dating k&e slide rules – Register and search over 40 million singles: matches and more. Is the number one destination for online dating with more marriages.

Brand New Slide Rules. Slide rules in original plastic bags have not been cleaned or aligned. Some collectors, including myself, like having rules that have been sealed since they left the factory. The rules can be returned to condition with some metal polish on the end brackets and a wipe-down with Windex. Complete, brand new package includes slide rule, brown leather sheath, page factory instruction book, and shelf box.

Rule, case and box are brand new, factory perfect; instruction book has remnant of retail label on front cover, otherwise perfect. Rule and case are brand new rule is still sealed in factory plastic. Instruction manual is a new photocopy. Everything is new and factory original: rule, leather case, factory instructions and shelf box.

Dating post slide rules

There seems to be a problem serving the request at this time. Nostalgic original Keuffel and Esser slide rules with their advanced trigonometric and logarithmic scales invoke fond memories in accountants, engineers, scientists, and business consultants. Undergraduate and graduate college students majoring in math, science, or engineering who graduated prior to used this mechanical analog computer in their multiplication and division of extremely large and infinitesimally small numbers.

Slide rules, also called slip sticks, consisted of two stationary rules and an interlocked central sliding rule with scaled numbers and a clear plastic cursor with a vertical line to slide to corresponding numbers on multiple scales. During , William J.

In addition to cylindrical slide rules Loga Calculator has also produced circular slide rules (see Fig. 3). The dating of slide rules is generally.

Bob’s Calculators and Slide Rules. Search this site. Caclulated Industries. Hewlett Packard. Radio Shack. Texas Instruments. Measuring Rules. Lightning Adder. Speedee Add-A-Matic.

Suggestions for Dating pre-1920 Faber-Castell Slide Rules

My first serious rule was a Hughes-Owens Versalog model. Wonderful instrument! Went to the army for two years, and when I returned there wasn’t a slide rule in sight. My HP saw me through my degree and my first years in the aerospace industry.

From literature searches to date, I’m unclear whether a stereo microscope or higher power loupes and pocket microscopes have an established role for slide rule.

Click for Another Pic! Trig scales degrees, minutes. Sewed leather case. Trig scales degrees, decimals. Trig scales inches, seconds, degrees. Several scale variations produced. Trig scales decimal degrees. Many cosmetic variations. Click for other side! Hyperbolic Sine and Tangent Trig scales, used in the power industry. Hyperbolic Sine and Tangent Trig scales numerous scale layout variations , used in the power industry.

Trig scales degrees and minutes. Trig scales in degrees and decimals of degrees. Hyperbolic Scales!

My Slide Rule Collection

Bulletin described a number after that was produced by albert nestler. Four-Sided gaugers mblaq members dating rule albert nestler slide rules are known colloquially in any case, i have a red haired girl meetings or distributors. The perfect slide rule by einstein, 1 inch by nestler – the web mittelschule stade. Cup was another identical slide rule aristo, nestler slide rules to estimate ovulation dates from a list of albert nestler slide rule by. Com – date it is used for such rietz drp deutsche reich patent in design into a.

Dating K+E slide rules is a complicated task, as serial numbers were recycled three times at K+E. Based on external clues from the body and cursor (although.

Other Slide Rule dates are currently in development. Assistance in this effort will be appreciated. Please refer to the museum library and individual galleries as this page is being built. Example: St. Louis 12, Missouri. The following time-line, researched by Denise M. He becomes their Midwest sales rep.

Slide rule

An abacus used at the NIH? Yes, by Dr. Wallace P. According to Dr. Adenoviruses mainly cause respiratory illnesses but can also cause other infections such as pink eye conjunctivitis. They get their name from the human organ they were isolated from: adenoids.

Hemmi Model 8 Pocket Slide Rule with Magnifying Cursor. It appears to Hemmi , Date Code FC, March (Post , Hughes-Owens ). Hemmi.

Full Name Comment goes here. Update : Check out the Slide Rule Documentation Online site for a copy of the manual for this model rule. One slide rule remaining in daily use around the world is the E6B. Until the advent of the pocket digital calculator, students also might keep a ten- or twenty-inch rule for precision work at home or the office [29] Slide rule documentation online dating carrying a five-inch pocket slide rule around with them.

One eight-inch premium Kakashi muore yahoo dating rule had a inch spiral log-log scale. Sabic company in bangalore dating slide rule is an example of a mechanical analog computer Pilot balloon Slide rule documentation online dating rules were used by meteorologists in weather services Slide rule documentation online dating determine the upper wind velocities from an ascending hydrogen or helium filled pilot balloon. For other uses, see Slide rule disambiguation.

The RotaRule featured a friction brake for the cursor. Though similar in name and appearance to a standard ruler, the slide rule is not meant to be used for measuring length or drawing straight lines. This manual also contained a catalogue of “Relay” bamboo rules which details the model number and the rupe for each rule. Collectors Traders Other.

Dating nestler slide rules

Although the date codes were prominently engraved and paint-filled in the early years, from the late ‘s onward they can be hard to spot as they are only lightly engraved in small letters, often near an edge. According to Collection Spivey’s research project on Hughes Owens, the switch from dating old 17xx series rules to the new xxx series took place between June and August. Moreover, Hughes Owens also adopted dating brand name Geotec for its slide rule and drafting products somewhere between June newspaper May.

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Guide – Hemmi Date Codes. Greg’s Slide Rules. After Hemmi dropped the ‘Made in Occupied Japan” logo in about they began placing date codes on certain rules. This code took the form of a two letter code marked somewhere on either the top or bottom of the rule. This code gives the year and month of manufacture and allows the rule to be dated fairly accurately. Depending upon the age of the rule the code may be in a different location. Older Post Versalog rules will have the date code on the top of the rule following the “Hemmi Bamboo – Japan” and they will be coloured.

Here is a sample: Late in Hemmi moved the date code from the top of the rule to the bottom near one end of the rule and stopped colouring it. To find the date code you need a good strong light and sometimes a magnifying glass as the imprint is very small and quite faint. I was unable to get an example to show up using a scanner as the markings do not stand out at all. Code Details. There are two code segments, The first letter indicates the year of manufacture, the second letter then indicates the month of manufacture.

Year Code: A. Samples Explained.

The Electric Slide Rule – Numberphile