With a 1900 manufacture date, it was almost certainly originally intended for glass plates; while roll film had been around for a while, I don't know that sheet film as we know it was available before the First World War. That camera might well have been "full plate" (a size that originates from Daguerreotypes) which, significantly smaller than 8x10 (6 1/2 x 8 1/2, IIRC) would have left room for quite a substantial frame around the plate. Or it might have indeed been made for 8x10; film holder standardization stemmed from everyone who used wooden holders copying the Kodak Premo 4x5, 5x7, and 8x10 holder format, which came along shortly after WWI.