Editing Slide calculator (section)

{{short description|Mechanical calculator}}
[[file:Addiator.jpg|thumb|An Addiator Duplex, featuring an addition side]]
{{multiple image|total_width=200
| footer = Two types of Addiators
| image1 = Modern Addiator.jpg
| alt1 = Picture of Addiator
| caption1 = Addition + subtraction, single window
| image2 = Addiator negative values.jpg
| alt2 = Picture showing result of 5 − 8 = −3
| caption2 = Negative value handling in complementary window
}}

A '''slide calculator''', also known as an '''Addiator''' [[Generic trademark|after the best-known brand]], is a [[mechanical calculator]] capable of addition and subtraction, once made by [[Addiator Gesellschaft]] of [[Berlin]], [[Germany]]. Variants of it were manufactured from 1920 until 1982. The devices were made obsolete by the [[electronic calculator]].