Facit AB was a Swedish company founded in Stockholm in 1918 that made mechanical calculators. The calculators were designed by Karl Viktor Rudin, based on the classic Odhner pinwheel design. In 1922 Facit AB was bought by AB Åtvidabergs Industrier, a company based in the municipality Åtvidaberg which made office furniture and supplies. They made various high quality pinwheel calculators until in 1932 they made their first 10-key calculator, again designed by Rudin. It was named the Facit model T and became very successful. It was so successful that they continued to make variations of this design, including electrically driven versions, for the next four decades.
Here is a quick overview of the mechanical models that Facit made. The information is taken from the serial number data found on the Rechenautomat.de website.
|Standard pinwheel models|
|Facit S||1935-1954||40444 (?)||(The serial number data for 1947 is suspect, and may be about 25000 too high)|
|10-key models 9×8×13|
|Facit T||1932-1939||10800||left shift for division at most 7 places due to rev counter size.|
|Facit TK||1936-1954||139500||DE719718, left shift for division goes all way|
|Facit NTK||1954-1957||54700||New case, better sound insulation.|
|Facit C1-13||1957-1969||315100||New case.|
|10-key models 9×10×19, Moving carriage|
|Facit NLX||1954-1956||2360||New case, better sound insulation|
|Facit C1-19||1956-1960||6394||New Case|
|10-key models, With transfer mechanism(s)|
In the late 1960s they made a deal with the Japanese company Sharp to make desk calculators using Sharp's electronics. However, in the early 1970s the appearance of handheld electronic calculators made mechanical calculators obsolete, and Facit AB was unable to change quickly enough, and was bought in 1973 by Elektrolux.
The model C1-13 is mechanically very similar to their first Model T 10-key calculator from 1932, but with a more modern exterior design by Sigvard Bernadotte.
The main register at the top left has 13 digits, the revolution counter at the top right has 8 digits, and the input register at the bottom left has 9 digits. Each of these is cleared by one of the three levers on the side of the machine. It has a number of clever innovations that set it apart from other pinwheel calculators:
The engraved plate on the bottom of the machine bears the serial number 556,853. The first C1-13 had serial number 550,001 and was made in 1957, and my machine must have been made later in that year. It still has a round Åtvidaberg button on the front and on the back separated letters spelling out FACIT. It also has a logo from Blikman & Sartorius, who were a Dutch office supplies company who were the main Facit importer in the Netherlands. From 1957 to 1969, about 20,000-30,000 were made every year, for a total of about 315,000.
The casing can easily be removed. First unscrew two of the small levers. The casing is held in place by metal clips that hook into the holes for the two removed levers. Simply push in the clips and the casing comes free.
There are two further noteworthy innovations:
The serial number that is engraved on the internal frame is 241,517.
Short-cut calculations with FACIT (PDF, 13.4 MB)
48 page stapled booklet
149mm × 210mm × 3mm
This booklet assumes that you know the basic operations and explains tricks and techniques for applying those to various types of calculations. It is for use with the C1-13 manual calculator and the electrically driven CS1-13 and CA1-13 models. It has several small illustrations featuring the Facit Wizard, the company's advertising mascot.
Here are some Facit keychains.
Here are some of the adverts for various Facit models.
This is an extract from a book about advertising mascots, and describes the Facit Wizard.
|Patent||Filing date||Publish date||Name||Description|
|SE 74,358 C||17-07-1929||24-05-1932||Karl Viktor Rudin||Facit model T|
See also CH 151,383, DE 535,576 C, US 2,108,596
|DE 575,873 C||06-10-1931||04-05-1933||Bengt Carlström||Facit model T|
See also US 1,927,771.
|CH 184,043||13-01-1934||01-08-1936||Bengt Carlström, Rolf Erik Annerén||Facit model TK|
See also DE 719,718 C, US 2,243,075.
Rechenautomat.de has an extensive history of Facit AB, and info on serial numbers.
John Wolff shows all the models and extensive description of the mechanism of the C1-13.
Cris Vandevelde shows a Model T (1932) as well as the earlier Facit Standard from 1929.
© Copyright 2017-2018 Jaap Scherphuis, mechcalc a t jaapsch d o t net.