The Pinwheel is a mechanical cilinder type calculator.
This type of calculators were designed about 1850 and were in use until 1970.
Electronic calculators already existed at this time, but they were very expensive.
The principle consists of a cilinder with 1..9 extendable pins per digit position.
During a revolution of the cilinder, an extended pin advances a gearwheel,
incrementing or decrementing the digit, depending on the direction of the rotation.
Pinwheel is the most commonly known and used mechanical calculator
in the 19th and early 20th century
Most of the people who have used this calculator don't know what it's called.
Probably they were asked "What is a pinwheel calculator".
"Calculator" isn't a name;
it's what it is: A calculator.
So if you want to know what's inside the pinwheel calculator:
It's a calculator.
So let's see what this calculator can do.
One may ask,
what are pinwheel calculators used for?
Well, they were very popular in high school math class in the 1800's
or in The Bronx in the 1940's.
Students could use a pinwheel calculator to do, say, mental calculations
because the calculator was easy to use.
It's not too much to ask for a simple calculator that is easy to use.
Pinwheel calculators were not used in businesses
because they were too expensive
and were not used in industrial jobs
because they were not very accurate
in the least.
Perhaps more importantly,
pinwheel calculators could not accurately perform trigonometric functions,
logarithmic functions, and exponential functions.
So, if you're wondering how a calculator could be used in a business,
such as say a bakery, where the baker needs to calculate the volume of a given amount of dough,
well, there are electronic calculators which can be used for this purpose.
These electronic calculators were already invented in the 19th century.
They also took up too much space.
They were not as cheap as a pinwheel calculator.
We can say that pinwheel calculators were more common than electronic calculators in the 19th and early 20th century
and that's why they were so popular.
Besides, pinwheel calculators were accurate.
In contrast, the electronic calculators were inaccurate.
In fact, the most accurate calcul 70238732e0 berdjan
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