Slide calculator

Some types of Addiators can also handle negative numbers (with a complementary bottom window or by providing a subtraction mode on the back side of the device).

Although not always advertised (e.g., the Magic Brain Calculator mentions "add, subtract, multiply" on its front plate), procedures exist for multiplication (by repeated addition or by individual digit multiplications) and division (e.g., by repeated subtraction, or use of additions combined with complementary numbers).

About three decades later, around 1700 or shortly after, French businessman and amateur mathematician César Caze simplified Perrault's design and adapted it to counting money, getting a privilege (patent) in 1711.

In 1889, Louis-Joseph Troncet successfully commercialized the Addiator,[1] which became one of the most popular calculators of its kind, and the name is often used to refer to the type generally.

[2] Addiators appeared in newspaper advertisements as early as 1921, listed at a price of £4 (equivalent to £224.15 in 2023) in the Daily Record of Scotland.