Mark I papertape equipment

markI ponsband
This picture shows a part of the paper tape equipment used in IBM's Automatic Sequence Controlled Calculator (Harvard Mark I,1944, a relay machine designed by Howard Aiken). Very wide tape (3.25", the width of a punched card) with 24 channels was used for the storage of function tables. It served in fact as what we today would call read-only memory (ROM).
The punched tape in the top picture looks similar to the tape used in the (now obsolete) Monotype typesetting machines: see the lower picture, recently taken in a traditional type foundry.
This could be more than a coincidence, as the British Monotype company contributed strongly to the weapon industry during World War II. However, the actual width of the Monotype tape is 4.3", and there are 26 channels in it.