This is am image taken from a book on tower clocks, published in 1911. The book itself is from the Building Technology Heritage Library at the Internet Archive.
The apparatus above, from page 34, powers both the dial and bells of a tower clock. The opening in the floor is for a pendulum of about 175 lbs. I find the image much more striking (pun quite intended) than those of the exterior, dials and all, of tower clocks. Besides the handsome illustrations, the book offers technical details and a description of the operation of tower clocks. There also is a directory of the companies installed tower clocks in 1911, as well as testimonials by satisfied customers.
If you are interested in historical buildings and / or engineering this book is for you.