For Mr Krengel et alia,
The Boardman feeder is described in the 1905 edition of the ABC of Bee
Culture by Root. Also in there is a biography of a Mr H R Boardman, born
1834 in Swanzey, N.H. but moved at the age of one to East Townsend, Ohio.
The biography was written in the present tense so he was still alive in
1905.so in all probability he was the designer of this feeder. Sid
P.