One of the wonderful amenities of older homes are "pocket" doors -- these are doors that slide, and disappear, into walls instead of being in the way. This particular set of two doors, in the old Nellie Glenn house, divides the dining room from a living room, and when the doors were pushed into the walls, a very large room was created. Very seldom will you see "pocket" doors anymore because there are not the normal part of home construction.
On a side note -- while I was working on these posts for this intriguing hardware, I 'googled' 1896 door pulls and doorknobs. At one point, I came across a Sears, Roebuck & Co. catalog for that year and lo-and-behold these were shown. As you may have noticed in other squint shots, I've wondered what might be original to the house and what items might be replications. I believe these might be the original pieces of hardware put in the pocket door at the time the house was built.