vintageasebo.blogg.se - Friden calculator ad

Friden rented a factory in Oakland (California) in December 1933, and produced the first calculator to his new design in June of 1934.

The "Friden Roto-Flow One-way Drive", like the contemporary Swiss MADAS machine, was essentially a modern implementation of the 19th-century Thomas Arithmometer. He sold his interests back to Marchant in around 1930, and established his own Friden Calculating Machine Company in 1933.įriden based his new machine on the long-established uni-directional stepped-drum mechanism, with subtraction accomplished via differential reversing gears on the registers. He found work with Marchant, and earned substantial royalties from his inventions. I was furnished a marchant calculator for my work at Quaker Maid in late 1950s."Ĭarl Friden (1891-1945) was a young Swedish engineer who arrived in the USA (via Australia) towards the end of the 1914-18 war. The building currently remodeled on the river north of Cherry street was American Can Company, where they made cans. That was when South 3rd street was undeveloped. There were several tomato canning plants in Indiana in 1930's and 1940's, including Louden Company on South 3rd street.

We used a marchant rotary calculator in the 1930's and 1940's to determine the value of a truck load of tomatoes in the family tomato canning factory. The answer was available instantly in the rotary numbers in the carriage. The carriage at the top of the calculator would step over for multiple addition or subtraction. No counting cycles for multiplication or division. They help, but don’t automate they are not internally connected."Friden and Marchant Rotary Calculator were fast and easy to operate. The two shift buttons between register I and registers 2/3 are used to determine the position of the decimal point.The small red button on the left stops a division.It also determines how many digits are are not calculated during division.

The blue knob on the left side determines how many digits are dropped during a transfer.

The right arrow-up key transfers the content of the result register III to the main register I.

Enter the second number and hit the “=” key. Enter the second number and hit the “=” key.Įnter the first number and hit the “:” key. There are also more adjustments than I have seen on any other machine.Įnter a number and hit the “+” or the “-” key.Įnter the first number and hit the “I X” key. It looks like there were a lot of ad-hoc design decisions. For that purpose the carriage registers are driven by a steel string which slips at certain moments during division.Īlthough I’m not an expert I have a slight suspicion that these machines were not very reliable. The way division is implemented requires that the carriage registers can be halted while the main register keeps rotating. This construction allows for a simple way of subtraction by slightly moving the carrier to the left to engage different gears. Technically it differs from it’s competitors regarding the construction of the main register. It is the last non-printing Hamann before the end of the mechanical calculator era. This is the only machine I have seen until now which is operated in almost the same way we use our today’s calculators.