Markus copied this from old beekeeper books owned by Dee Lusby.
These are the evidences that the bee cells were much smaller in the past and were artificially enlarged.
And be careful when comparing the antigue cell sizes and from 1893 onwards.
It was previously measured by the rhumbus method, and later by the square decimeter method introduced by Baudoux:
http://www.resistantbees.com/zelle_e.html#fatal
Click on the pictures to enlarge!
american_bee_journal_sept_1897
american_bee_journal_sept_1897
Russia August 1927
Compilation of the different cell sizes:
more info:
http://www.resistantbees.com/zelle_e.html