According to a newspaper article in The Daily Notes (Canonsburg, Pa.), Mr. Weller bought his first studio from his employer and mentor in 1890. He was definitely in business on his own in 1891 since he placed an advertisement in the newspaper. Weller also had a studio in the city of Washington, Pennsylvania, and I'll share those cabinet cards in a future post.
As far as I can tell, Weller's studio operated in Canonsburg until 1915 when he sold it to R.N. Sandberg. So I'm assuming the photos below can be dated as 1890-1915. If you are one of my husband's cousins and can help identify these Cowden photographs, I would love to hear from you!