The only information that I found out so far is that
The Martin Luther Orphanage records are located at Homme Home, P.O. Box G, Wittenberg, WI 54499. A phone number is 715-253-2116. The Orphanage began operating in 1889. It began in Madison and in 1894 it was moved to Stoughton, Dane Co, WI.
Sandi Clark said that she could not find any information from Homme Home but she did get information from another way. I wrote to her but she never answered where she got the information. Maybe if you write to her she may answer you.
I did find my father's brother on the 1940 census.
If I find any information about the Orphanage I will let you know. Have a good day.