I have no life, so I came upon this gem.
"The photo is titled "Two Engines of Equal Power".
I found the size difference quite astounding.
Apparently, the photo originally appeared in 'Power' magazine, 1903 and then as a frontispiece in a book "Modern Engines & Power Generators".
"Made by Yarrow of Poplar, the large one was built for the East London Water Works, triple expansion, 20, 32 & 53 inch cylinders with a 42 inch stroke, 16 rpm @ 150 psi, 80 ton. Small engine was for torpedo boat: triple expansion, 8, 12 & 17 inch cylinders with 9 inch stroke, 550 rpm @ 250 psi., 2 ton. Both rated at 250 hp."
