s a manual aid to calculating that consists of beads or disks that can be moved up and down on a series of sticks or strings within a usually wooden frame.
are numbered rods which can be used to perform multiplication of any number by a number 2-9.
s a mechanical calculator invented by Blaise Pascal in the early 17th century. He designed the machine to add and subtract two numbers directly and to perform multiplication and division through repeated addition or subtraction.
The jacquard´s Loom
s a device fitted to a power loom that simplifies the process of manufacturing textiles with such complex patterns as brocade, damask and matelassé.
is an automatic mechanical calculator designed to tabulate.
it was designed with the main purpose to make some multiply, divide, sum, subtraction, exponent and exponents.
G. Herman Hollerith
his Tabulating Machine was made to store and summarize all the information.