Jaap's Mechanical Calculators Page

Direct II

Direct II


Introduction
My Direct II
How to use the Direct II
Direct II Video
Patents
Links


The company Moesch & Huber was founded by Carl Moesch and Hans Huber in Zürich in 1921 or earlier. They constructed the Demos calculator in about 1922, which was an unsuccessful pinwheel calculator. The Direct calculator followed in about 1926, and later the similar but slightly improved version, the Direct II. There was also a variant called the Direct L which was a listing machine, and the Direct EL which was an electrically driven version of the Direct L listing adding machine. All these variants seem to have been made in two different sizes, one that is 2 columns/digits wider than the other.

The company name shown on the Direct calculators is Theo Muggli AG, also based in Zürich. This company sold office equipment, mainly typewriters and calculators. It is unclear to me how much Theo Muggli himself was involved in the manufacturing of the Direct machines, but his company was the sole distributor of them. Theo Muggli died in 1933, but the company that was named after him continued after his death using the same name until it was finally dissolved in 1995.


My Direct II

The Direct and earlier versions of the Direct II had a black case with a green keyboard plate, and black and white keys. Later the colour of the Direct II was changed to dark brown, with a light brown keyboard and brown and white keys. The differences between the Direct and the Direct II are minor. The Direct had two buttons for selection of + and × mode, whereas the Direct II has a single switch. Also, the two buttons marked S'tot and Corr were combined into a single S/C button.

My Direct II is one of the later versions, so its casing is brown. It has 10 columns of keys, and a 10-digit register. Its serial number is 26509. It is not exactly known when these machines were produced, but it seems they were being made and sold until the 1950s.

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How to use the Direct II

The Direct II has two registers. The display register generally shows the input, but there is also an internal register that keeps track of the result of the calculation, i.e. it holds the running total of all the numbers that were added or subtracted.

The controls are as follows:


Direct II video

Here is a video where I demonstrate my Direct II.




Patents

Here are all the patents by Hans Huber and Carl Moesch that I was able to find. Only one seems to be for the Direct adding machine.

PatentFiling datePriority dateNameDescription
CH 101,84805-09-192216-10-1923Hans HuberDemos calculator
See also DE 405,510 B.
CH 122,10225-03-192501-09-1927Hans HuberDirect display register
See also AT 108,510 B.
FR 613,22022-03-192612-11-1926Hans HuberCarry mechanism, unknown listing machine
CH 234,61410-09-194215-10-1944Carl MoeschMultiplication counter for a Comptometer type adding machine.

Links

Rechenmaschinen-Illustrated shows a black Direct II and the listing variant Direct L.
National Museum of American History's collection of adding machines includes a black Direct II that came from Dorr E. Felt's collection.
Rechnerlexikon's entry for the Direct II.
American History Museum has a black Direct II.


© Copyright 2017 Jaap Scherphuis, .