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For forty years the arithmometer was the only type of mechanical calculator available for sale until the industrial production of the more successful Odhner Arithmometer in 1890. [8] The comptometer, introduced in 1887, was the first machine to use a keyboard that consisted of columns of nine keys (from 1 to 9) for each digit.
Use these free pumpkin carving patterns and stencils to create the best jack-o-lantern on the block. Choose from spooky, cute, and advanced templates.
There are typically three stringers, one on either side and one in the center, with more added as necessary for wider spans. Side stringers are sometimes dadoed to receive risers and treads for increased support. Stringers on open-sided stairs are called "cut stringers". Tread rise: The distance from the top of one tread to the top of the next ...
If deck space is available, homeowners may choose to include for the seating, outdoor couches and benches. Larger buildings may also have decks on the upper floors of the building which can be open to the public as observation decks or greeneries. A deck is also the surface used to construct a boardwalk over sand on barrier islands.
Stringer (name), includes a list of people with the name Stringer (journalism), a type of freelance journalist Stringer, Mississippi, an unincorporated community; Fish stringer, a piece of cord or chain used to keep fish alive and secured while an angler continues fishing
The calculator was code-named Wizard, [4] which is the first known use of a code name for a calculator. It also contained an Easter egg that allowed users to access a not-especially accurate stopwatch mode. [5] [6] An accurate version of the stopwatch mode was officially featured in the 1975 successor of the HP-45, the HP-55.
A difference engine is an automatic mechanical calculator designed to tabulate polynomial functions. It was designed in the 1820s, and was created by Charles Babbage . The name difference engine is derived from the method of finite differences , a way to interpolate or tabulate functions by using a small set of polynomial co-efficients.
Pascaline (also known as the arithmetic machine or Pascal's calculator) is a mechanical calculator invented by Blaise Pascal in 1642. Pascal was led to develop a calculator by the laborious arithmetical calculations required by his father's work as the supervisor of taxes in Rouen , France. [ 2 ]
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