| Addiator Arithma Junior |
| Model |
|
|
| Maker |
|
Addiator |
| Origin |
|
W.Germany
(marked Foreign) |
| Date |
|
1960s |
| Serial |
|
|
|
| |
| A pocket calculator for sterling currency. |
| |
| The stylus, carried clipped to the
side of the Arithma Junior, is used
to slide the bands up or down as required. |
| |
| The top set of numbers is used for
addition. If the number is white it
is pulled down to the bottom. If red
it is pulled up to the top, round to
the left and down to carry to the next
column. |
| |
| The bottom set is for subtraction.
This time, if the number is white it
is pushed up to the top and if it is
red down to the bottom, round and up
to the left to carry. That means that
in either addition or subtraction, white
is to the middle and red is away from
the middle. |
| |
| The result is shown in the central
display. |
| |
| The arithma has a soft carrying case. |
| |
| |
