The lens should be a modern anastigmatic by a good maker.
"How to Observe in Archaeology" by Various
Lens, Zeiss Kodak Anastigmat f.6.3.
"Premo Cameras, 1914." by Canadian Kodak Company
For those, however, who wish even greater efficiency and capabilities, we supply the anastigmat lens equipments.
"Kodaks and Kodak Supplies, 1914" by Canadian Kodak Company
It is a symmetrical lens, and in this different from the Zeiss anastigmats that preceded it.
"The Barnet Book of Photography" by Various