I have searched extensively on the internet and can't seem to find a mention of windows like mine! I would love to understand my windows, their age, mechanism, etc. My house was built around 1865-1870. The windows seem very old, though they don't have ropes and pulleys. They have a thin, rounded (not flat tape) metal cord and metal plates in the sides, covering the mechanisms. I was hoping someone could teach me a little about them or perhaps at least tell me when they might be from? Thanks so much in advance!!!