Old-fashioned scale
A scale is emblematic of the methodology of experimental design which includes comparison, replication, and factorial considerations.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Balance à tabac 1850."
https://en.wikipedia.org/wiki/File:Balance_%C3%A0_tabac_1850.JPG
Wikipedia
CC BY-SA.
