All that can presently (June 2019) be gleaned from sheet music covers and by internet searching is that C.L. Barnhouse is the one-off composer of
Geo'ge Washin'ton's Birthday Pahty (1899).
An educated guess is that Barnhouse was also the publisher
C. L. Barnhouse Company, Oskaloosa, Iowa, USA.
Surfers are welcome to contribute information about this composer.