I scaled off a large format B&W .tif image obtained from the Library of Congress’ historic American building survey to find the dimensions. The technique is easy with this photo since not only is it a straight-on shot with no distorsion, but I have one known measurement to use to calculate the scale of the objects in the photo with. Using the ruler in an image editor I found the measurement of one of the medallions I own (not shown in the view) which is 18″ to come up with a pixel measurement of the section where the yellow line is. I found that yellow line compared to the size…