This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Brockhaus and Efron Encyclopedic Dictionary wrong. Brockhaus and Efron Encyclopedic Dictionary XXI Illustration from Brockhaus and Efron Encyclopedic Dictionary wrong formula from Brockhaus and Efron Encyclopedic Dictionary according to vol XXI errata reproducrion from DVD iddk ru html between painter from