Vintage 1947 Brunsviga 15 Mechanical Calculator One of only 7470 produced! Still Working!

SPLENDID BRUNSVIGA MODEL 15 MECHANICAL CALCULATING MACHINE MADE IN GERMANY BY THE FAMOUS BRUNSVIGA-MASCHINENWERKE GRIMME, NATALIS & CO AG IN GERMANY BETWEEN 1934 AND 1947. SERIAL NUMBER 219817 INDICATES IT WAS MADE POSTWAR IN 1947. STILL WORKING - ALTHOUGH THE RESET TO ZERO LEVERS SEEM STUCK THIS CALCULATOR CAN STILL PERFORM ADDITION, SUBTRACTION, MULTIPLICATION AND DIVISION OPERATIONS WITH CRANK HANDLE TURNING SMOOTHLY IN A FORWARDS AND BACKWARDS MOTION WHILST MAKING NICE REPITION CLICKING SOUNDS.
 
Attached to the upper right side is a small oval plate with the brand logo on the white lacquered lettering. This logo of a human head with internal gears would start to be used on Brunsviga machines from 1930 onwards. On the lower part, the brand name and model: BRUNSVIGA 15, as well as the manufacturer's data, appear in white letters.
 
THE BRUNSVIGA 15 STILL CAN PERFORM ADDITION, SUBTRACTION, DIVISION AND MULTIPLICATION OPERATIONS. It has a counter register at the top which increases by one with addition and decreaces by one with subtraction. It has an 10 digit input register numbered 1 to 10 and an 15 digit output register below. With addition (one turn of crank handle) the number in the input is added to the output number and the counter grow with one. Subtraction you turn crank in opposite direction. It can multiply by small numbers by turning the crank a small number of times in the forwards direction.
 
A TOTAL OF ONLY 7,470 OF THE BRUNSVIGA MODEL 15 PINION WHEEL MACHINES WERE MANUFACTURED BETWEEN 1932 AND 1948. IN 1934, IT COST RM 640.  Model 15 was the successor model to the Nova II, which had been built since 1925. In 1927, the heavy types of the Nova series (I, II, III, IV, Iva) were supplemented by a lighter variant, the Series 13, with its descendants (13, 13 Z, 13 ZK). In addition to Model 15, there was also Model 20, which had slightly larger movements (12 x 11 x 20) and whose resulting movement could be divided.
 
THIS TYPE OF MACHINES ARE OBJECTS FOR SCIENCE LOVERS. They have their origin in the 17th century, when the first adding machines were built, characterized by using a gear-based operation, which arise to alleviate the work activity of those people engaged in accounting work. This type of machines were much admired at the time.
 
SIZE: 18CM H X 42CM W X 24 CM D
WEIGHT: 12 KG
 
CONDITION: The shiny black metal case has some scrapes and vintage wear. The white and red enamel numerals are neatly arranged on the front of the piece. Crank mechanism located on the right side of the device, turns smoothly. TESTED and can do addition and subtraction. It seems to be able to perform multiplication and division as well. Reset (to zero) levers seem stuck for counter, input and output registers but maybe I just dont know how to get it unstuck. Thus you must work with the input settings as it is at the moment.
 
MARKINGS: BRUNSVIGA 15
219817
BRUNSVIGA-MASHINENWERKE GRIMME, NATALIS & CO. A.-G.
 
BRUMSVIGA MECHANICAL CALCULATOR HISTORY:
The company Grimme, Natalis & Co was set up in November 1871 by Carl Grimme and Kaufmann A. Natalis. They were both sewing machine manufacturers who had decided to join forces. In 1892 they began making pinwheel calculators in their plant in Braunschweig (Brunswick) using the brand name Brunsviga, which is the latin name for the town. Their main engineer and co-director Franz Trinks devised several new designs. It took many years for the market for calculators to develop, but through extensive advertising using the slogan "Gehirn von Stahl" (Brains of Steel), demand grew. Eventually the demand for calculators even began to outgrow that of sewing machines.
In 1927 the company incorporated the brand name into its company name, changing it to "Brunsviga-Maschinenwerke Grimme, Natalis & Co AG", because by then it was producing calculators almost exclusively. The launch of the Brunsviga 13 also occurred around 1925. In 1929, Franz Trinks developed his last model, the Brunsviga Dupla which happened to be electrical. He died in 1931.
In 1952 60 years after the first model, 60 different types were available on the market and the firm accounted for 265.000 sales. Only around 500,000 machines were manufactured in various models through the years.
Competition between calculator companies was fierce, and in 1957 Brunsviga was bought by Olympia a company that mostly made typewriters. By 1959 the merger was complete, and all but a few Brunsviga models were discontinued.
 
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