National Rechenwalze, A.G. "System Billeter"
Originally: Julius Billeter Rechenwalze. Gallery includes specimen by son Ernest Billeter
Julius Billeter (1828 - 1914) made 'Rechenwalze' (Computing Rollers)
cylindrical slide rules for the financial industry based on Billeter's 1894 patent.
US Patent No. 513,172 January 23, 1894. French Patent No. 217,367 Nov. 10, 1891.
Most of the designs were marked as "System Billeter".
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National Rechenweize "System Billeter"
Modell No 20 - 1918 Cylindrical Slide Rule
ISRM 13.03.15.01.X
Carolina Radu, John And Walter |
John William Radu
(1879-1944) |
John William Radu with Crow
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National Rechenweize System Billeter Modell No20 1918
Cylindrical Slide Rule (Computing Roller)
Made in Switzerland by National Rechenwalzen. Zurich, Switzerland. c1940,
Construction: Varnished paper scales on 20.5cm (8.12in) dia. x 57.3cm (22.5in) long metal cylinder and on
sliding cylindrical cage. Metal support stand.
Scale: 80 sections of C & D scales equivalent to 20 meters (65.6 ft) in length.
As part of the artifact, the wooden box is present that it was shipped in when it was sent from Zurich to New York City in 1940.
Robert A. Ecker
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This specimen was acquired from Robert Ecker of Long Valley, New Jersey, who owned and preserved this excellent math instrument for 60 years. Robert graduated from Brown '55 (mechanical engineer, tau beta pi);
commissioned USAF, active duty Germany '57-'58 (missile guidance), reserve Capt. until '62 .
Employed by ExxonMobil '56-'85, (refinery ops, supply planning, tanker design).
Robert is a current ham radio operator (W2EKZ Amateur Extra),
Robert A. Ecker expanded Biography
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Robert writes:
"It belonged to my grandfather, John William Radu (born 6/3/1879 in Poland or Romania, and died in
Manhattan 6/4/1944.. He lived in Rochester, NY where he graduated from the University of Rochester
and later moved to New York, NY. He was a many talented person designing and building medical
instruments for his own company and teaching at well known technical Stuyvesant High School in New York.
He built telescopes, collected minerals, conceived magic tricks for Howard Thurston, collected clocks
and music boxes, and must have been a very interesting person. I was only 11 when he died but remember
him showing me his collection of fluorescent minerals under a black light."
A record search shows that he attended U of R between 1903-1908 and that he had his own company, as General
Manager of Radu Surgical Instrument Co. during the same time from 1907-1911. Then he was superintendant
of the German Insurance Building, in Rochester, starting in 1911. In 1920 he was approved to be an
assistance teacher (Instrument making) for high schools and appointed to Stuyvesant (NY Times
Jan 30,1920).One can see why he liked this slide rule. More info on his career was in a donation to
UofR in 1947 in his name that shows a more detailed work history (see attached). There is a
reference that he married Clara Louise Coit who was an Alumnae class of 1897 Elmira College.
She was Robert Ecker's Mother's Mother.
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REF Billeter Rechenwalze 4M Cylindrical Slide Rule
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Billeter Rechenwalze 4M Cylindrical Slide Rule
Made in Switzerland by Julius Billeter. Zurich, Switzerland c1900,
Construction: Varnished paper scales on 5-cm dia. metal cylinder and on
metal vanes on a sliding cylindrical sleeve. Wood support stand
Scale: 20 rows of C & D scales equivalent to 4 meters in length
Note: This is an early example matching Billeter's 1894 patent.
Later examples carry "National Rechenwalze - System Billeter"
Archive - Ed Chamberlain Collection
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REF National Rechenwalzen System Billeter Modell No8 Cylindrical Slide Rule
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National Rechenwalzen System Billeter Modell No8 Cylindrical Slide Rule
Made in Switzerland by National Rechenwalzen. Zurich, Switzerland c1900,
Construction: Varnished paper scales on metal cylinder (8 cm dia. x 16 cm long)
and on metal vanes on a sliding cylindrical sleeve. Metal support stand.
Scale: 40 rows of C & D scales equivalent to 8 meters in length.
Note: Formerly Julius Billeter Rechenwalze. Frequently used by European banks and
accounting offices.
Archive - Ed Chamberlain Collection
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REF National Rechenwalzen System Billeter Modell No16 Cylindrical Slide Rule
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National Rechenwalzen System Billeter Modell No16 Cylindrical Slide Rule
Made in Switzerland by National Rechenwalzen. Zurich, Switzerlan c1910,
Construction: Varnished paper scales on 16cm dia. x 36.5cm long metal cylinder and on metal vanes
on a sliding cylindrical sleeve. Metal support stand.
Scale: 80 rows of C & D scales equivalent to 16 meters in length.
Note: Formerly Julius Billeter Rechenwalze. This cylindrical slide rule has a metal
support stand that could be wall mounted. Frequently used by European banks and
accounting offices.
Archive - Ed Chamberlain Collection
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REF National Rechenwalze System Billeter Modell No20 1918 Cylindrical Slide Rule
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National Rechenwalze System Billeter Modell No20 1918 Cylindrical Slide Rule
Made in Switzerland by National Rechenwalzen. Zurich, Switzerlan. Alleinige Fabrikanten, Switzerland c1920,
Construction: Varnished paper scales on 20.5cm dia. x 57cm long metal cylinder and on
sliding cylindrical cage. Metal support stand.
Scale: 80 sections of C & D scales equivalent to 20 meters in length.
Note: Formerly Julius Billeter Rechenwalze. This cylindrical slide rule has a metal
support stand that could be wall mounted. Commonly used by European banks for
currency trading. This is a previously unknown size. The largest previously known
National cylindrical slide rule had a 16-m scale length.
Archive - Ed Chamberlain Collection
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C.O. Browne, Melbourne, Australia
C.O. Browne Cylindrical "Long Scale Rule"
REF
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C.O. Browne Cylindrical "Long Scale Rule"
Made in Australia by C.O. Browne. , No. F.C.46
Diameter 3", length 13" closed, 18" maximum
Similar construction to Fuller Cylindrical Slide Rules.
The single helical scale is marked on a cylinder about 2-3/4" in diameter and 4-1/2" long.
The scale makes 50 turns around the cylinder, for a total length of 413" (34 feet, or 10.5 metres).
It is marked to 4 significant figures at the top end, and can be read to 1 part in 20000.
The inner core of the rule is covered with tables of constants, formulae, and conversion factor
Scan provided by John Wolff. Australia
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Air Ministries Laboratory (AML) Bygrave
GB162895A
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In 1920 Capt. Leonard Charles Bygrave of the Royal Air Force patented (GB162,865A) a slide rule design in which the scales formed helices wrapped around concentric telescoping
tubes. This allowed the scales to be made sufficiently long (nearly 8 meters) to obtain the required calculational accuracy. Bygrave's method for solving the navigational
triangle involves splitting it into two right triangles and applying Napier's rules. The required operations can then be reduced to a series of multiplications and divisions of
the trigonometric functions of the relevant angles. By suitable rearrangement these can all be written in terms of cosines and cotangents, or equivalently secants and
tangents, The Bygrave slide rule scales are the logarithms of these functions. Versions of the Bygrave slide rule were produced in Germany and Japan both for marine and
aerial use. In German versions, a mechanism that allowed the sliding scale tubes to be locked to together during calculations was introduced.
See "Bygrave Scales" by Robin G. Stuart, 2014 for making your own
Bygrave scales.
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 Höhenrechenschieber (Dennert & Pape) Bygrave (German version)
 Bygrave (Japanese version)
Keuffel & Esser
The 4012 and 4013 are cylindrical slide rules designed by Edwin Thacher in the late 1800s. It was patented in 1881. In 1891 K&E purchased the rights to the patent and began producing it.
The rule is a series of segmented B, C, & D scales arranged on a rotating cylinder. The 4012 is the basic rule. The 4013 is a 4012 with a magnifying glass mounted on it.
The rule was produced by K&E from 1891 to 1952. There were 3 variations in the construction methods over the life of the product:
Note: Thacher's spiral slide rules were rebranded by K& E Models Type I: 1740N, 1740, 1741 (1887-1900); Type II: 4012, N4012, 4013, N4013 (1900-1952) .
Type I ---- Model numbers 1740 and 1741 produced from 1891 to 1899.
Type II --- Model numbers 4012 and 4013 produced from 1900 to 1927.
Type III -- Model numbers N4012 and N4013 produced from 1927 to 1942. The N4012 continued on till 1952. Scale numbering was added to the end of the scales.
LOGA
Daemon-Schmid, Zurich, Switzerland
Daemen-Schmid (Loga) 24 meter cylindrical
REF
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Daemen-Schmid (Loga) 24 meter cylindrical
Made in Switzerland by Daemon-Schmid 1915-1920
Paper faced aluminum drum
CD (100-1000) scales divided into 60 segments for a total length of 24 meter
Archive - Ed Chamberlain Collection
 Galai Photo.
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Loga Calculator (Daemen-Schmid) 15 meter cylindrical
REF
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Loga Calculator (Daemen-Schmid) 15 meter cylindrical
Made in Switzerland by Daemon-Schmid
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Loga (Daemen-Schmid) 7.5 meter cylindrical
ISRM (deaccessioned 11.15.2023)
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Loga (Daemen-Schmid) 7.5 meter cylindrical
Made in Switzerland by Daemon-Schmid c1930
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Loga (Daemen-Schmid) 7.5 meter cylindrical
REF
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Daemen-Schmid (Loga) 7.5 meter cylindrical
Made in Switzerland by Daemon-Schmid c1930
Archive - Ed Chamberlain Collection
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Loga (Daemen-Schmid) 2.5 meter cylindrical
REF
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Daemen-Schmid (Loga) 2.5 meter cylindrical
Made in Switzerland by Daemon-Schmid c1930
Archive - Herman's Slide Rule Catalogue
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Loga Slide Rule
REF
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Loga Slide Rule
Made in Switzerland - Paper and metal backing
Front Scale:
Zz(K1), A [ B, R, C ] D, Zz(K2)
Back Scale:
A [ B, R ] C, Currency Conversions
Archive Herman van Herwijnen's Slide Rule Catalogue
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Loga Pocket Slide Rule
REF
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Loga Pocket Slide Rule
Made in Switzerland - Paper and metal backing
Front Scale:
K, A [ B, R, C ] D, Log
Back Scale:
A [ B, R ] C, Currency Conversions
Archive Herman van Herwijnen's Slide Rule Catalogue
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McFarlane, Glasgow, Scotland
McFarlane's 6 inch Calulating Cylinder (1835)
REF
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McFarlane's 6 inch Calulating Cylinder (1835)
Made by McFarlane, Glasgow, Scotland. Mid 19th century
McFarlane's Calculating Cylinder" (c. 1833), consisting of a cylinder with three
separate revolving parts, on which are inserted several series of numbers,
calculated to propose and answer questions to an almost indefinite extent in
the first four rules of arithmetic. Note that this device does not utilize logarithmic scales.
Made of paper covered turned mahogany, 6 3/8" long overall x 2 1/4" diameter, in 3 sections
plus 2 threaded end pieces. There are two columns on the top section, one column on the
center section, and three columns on the bottom section. The apparatus is designed facilitate
calculations in interest on English money. It is one of the earliest examples of a
handheld cylindrical calculating device.
Archive - Images from 2009 Phillip Wiess Auction, London Science Museum Collection, Gemmary,com
1833 at NMSI.UK
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 Carbic Ltd., London
Cylindrical Pocket Slide Rule with Helical Scales
Scale effective length 66 in (168 cm) with 4 significant figures.
Otis Carter Formby King biography by Susan Richards
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Known addresses of Carbic Ltd. (1921-1972):
0: 44 & 66 Bray's Lane, Coventry (1921)
A: "Ashdene," Emscote Road, Stoke, Coventry (1922)
1: 51 Holborn Viaduct, London, EC1 (c1940)
2: 137 Conway Road, London, N14
3: 171 Seymour Place, London, W1
4: 54 Dundonald Rd, London, SW19
(Addresses 0, 1, 3, and 4 are found
on instruction sheets or rules)
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Patents
UK patent GB 183,723 (1921)
UK patent GB 207,762 (1922)
UK patent GB 207,856 (1922)
US patent US 1,645,009 (1923)
Canadian patent CA 241986
Canadian patent CA 241076
French patent FR569985
French patent FR576616
German patent DE 418814
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Known Scale Sets: 409/410, 414/423, 416/417, 422/424, 429/430
Known Models: K, L, N.
R.H. Smith
W.F. Stanley, Great Turnstile, Holborn, London
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The company was founded in 1854 by William Ford Robinson Stanley (1829-1909). it became a limited company (corporation) in 1900. In 1861 Stanley invented a prize-winning straight-line dividing machine that was used to make accurate scales for slide rules and other mathematical instruments. Among the slide rules manufactured and distributed by the Stanley company were the C.T. Cooper slide rule and the Fuller spiral slide rule, designed by George Fuller in 1878. The H.O. Barnard's slide rule is from 1919. Included in Stanley's 1912 catalogue and continuing there until 1958 was Barnard's Coordinate calculator. It is very similar in construction to the Fuller instruments but its pointers have multiple indices so additional trigonometrical functions can be used. It cost slightly less than the Fuller-Bakewell and a 1919 example is held by the Science Museum, London. In 1962 the Whythe-Fuller complex number calculator was introduced. As well as being able to multiply and divide complex numbers it can convert between Cartesian and polar coordinates.
Note: Professor Fuller's spiral slide rules were rebranded by K& E Models 1742 (1887-1900) and 4015 (1900-1961).
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Barnard's Co-ordinate Spiral Slide Rule
ISRM 24.06.10.01
Note: the LAT COS (Latitude) and DEP SIN (Departure) scale labels.
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Barnard's Co-ordinate Spiral Slide Rule 1909 sn23
Made in United Kingdom Designed Henry (Henri) Osmand Barnard - (1869-1934). Geodesic engineer. M.S., A.C.H. and
Fellow of the Royal Astronomical Society. He was a Superintendent Trigonometrical Surveys, Ceylon (now Sri Lanka) Survey Department. Made by W.F. Stanley & Company See more of his biography in the SR Who's Who page
Description from 1914 catalogue: The Co- ordinate Spiral Slide Rule has been
designed to meet these requirements by Mr. H. O. Barnard, Like Professor Fuller's rule, upon which it is an improvement, it enables the user to perform
Barnard's co-ordinate spiral slide rule.with speed and accuracy arithmetical computations involving multiplication, division, proportion, continuous fractions,
powers, roots, and logarithms ; but in addition, the natural and logarithmic values of trigonometrical functions of any angle
can be determined by inspection with the same accuracy as in numerical computation, while the products, quotients, etc. , of
these functions, by lengths or numbers, integral or fractional, are obtained with equal ease, rapidity and precision . The scope
of its operations will be gathered from the examples which are given to illustrate its use in the instructions supplied with the rule.
Although the co-ordinate spiral rule, as all varieties of slide rules, is based primarily upon the theory of logarithms,
a knowledge of that theory is by no means essential to its practical use.
Original owner: Dr Garry J. Tee, (1933-18Feb2024), Professor Emeritus (1968) Department of Mathematics, University of Auckland, New Zealand.
Gift facilitated by the Powerhouse Museum, Sydney, Australia with permission from Dr. Tee.
Prof. Dr Garry J. Tee, (1933-18Feb2024)(B.Sc. 1952, M.Sc. 1954). grew up during the 1930s Great Depression and in the South Island railway camps of that era.
After Garry Tee graduated from Auckland University College as M.Sc. (N.Z.), his first job was as a computer, with an oil prospecting team in
northwest Australia. In 1958, human computers began to be supplemented by electronic computers in geophysics, and it was obvious to him
that electronic computers were going to become extremely important. Accordingly, he went to England, where he became a mathematician in
English Electric Company, which manufactured DEUCE computers (based on Alan Turing's design for ACE). From 1964 to 1968 he was a
foundation member of the Department of Mathematics at the University of Lancaster, and then he returned to the Department of Mathematics
at the University of Auckland. He has published on numerical analysis and on the history of science, and he has translated books and papers on
numeric analysis from Russian to English. Full Obituary
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Professor Fuller's Calculating Slide Rule
ISRM 12.01.03.01.X
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Professor Fuller's Calculating Slide Rule
Made in United Kingdom by W.F. Stanley & Company - Designed by Prof. George Fuller in 1878.
Original owner in UK
Description from 1912 catalogue: "Professor Fuller's Calculating Slide Scale, the most accurate od all calculating scales, is equal
to a straight slide rule 83 feet long, and gives logarithm, multiplication, division, proportion, etc., results in four or five figures. Its range is
greater than that of most arithetical machines, as besides the operationsof multiplication and division which many instruments can only
perform, results requiring the reciprocals, powers, roots or logarithms of numbers can be quickly and easily obtained by its use. Largely
used by civil, electrical, and mechanical engineers, actuaries, quantity surveyors, etc. In mahagonay case with instructions for use."
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Elizur Wright Arithmeter
Made by Joseph W. Fowle, USA, 1869
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Elizur Wright III (1804-1885), born in South Canaan, Connecticut, was an American mathematician and abolitionist. He was a graduate of Yale College. He is sometimes described in the United States as "the father of life insurance", or "the father of insurance regulation", as he campaigned that life insurance companies must keep reserves and provide surrender values. Wright served as an insurance commissioner for the Commonwealth of Massachusetts. He devised a new formula and created actuarial tables to help insurance companies set premiums. finding the values of policies of various terms, known as the “accumulation formula,” and, in order to facilitate his work, invented and afterward patented (1869) the “arithmeter,” a mechanical contrivance for multiplication and division, based on the logarithmic principle, a form of cylindrical slide rule. U.S. Patent 93,849 issued August 17, 1869. wikipedia.
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Wright's Arithmeter No. 8 Cylindrical Slide Rule
REF |
Wright's Arithmeter No. 8 Cylindrical Slide Rule
Made by Joseph W. Fowle, USA, 1869
Materials" Brass and wood. Paper scales on a brass drum.
Dimensions of Instrument: 36 cm x 48.2 cm x 48.2 cm; 14 3/16 in x 18 31/32 in x 18 31/32 in
Note: Wright sold the Arithmeter to insurance companies for $500.00, though only about 20 were made.
Archive - National Museum of American History
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Wright's Arithmeter No.11 Cylindrical Slide Rule
REF |
Wright's Arithmeter No.11 Cylindrical Slide Rule
Made by Joseph W. Fowle, USA, 1869
Archive - Computer History Museum in Mountain View, California
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Japanese WWII Navy Bygrave Position Line Slide Rule For Navigation
Leather Case
Snap Case
Manual PDF 21MB
Leather Case
Wright's Arithmeter No. 8 Cylindrical Slide Rule
Wright's Arithmeter No.11 Cylindrical Slide Rule
