Darnley's Rotatable Lightning Calculator Pen Case
Darnley's Rotatable Lightning Calculator Pen Case, manufactured in 1920s. The barrel rotates to give every answer to times tables up to 20x20. The cap removes for pen storage and also has a ruler printed on the side
Picture No
11041616
Media ID
46877846
Size
6000px x 4004px
(3.3MB)
Credit
(c)Maurice Collins Images Collection /Mary Evans Picture Library
Source
Photograph of an original object in the Maurice Collins Collection
Date
1920s
Pick your License
Adding Addition Calculator Collectable Collectables Divide Gadget Lightning Mathematics Maths Multiplication Multiply Pens Rotatable Rotates Rotating Rules Stationery Storing Subtract Subtraction Sums Widget
Features In These Collections
> Contributors > MAU
