(this is a very small original image – see note on image sizes)
A lithograph, transferred from a steel plate engraving, with the sky printed in blue from a separate woodblock, published by Thomas Nelson & Sons, c1860. Known as a Nelson print – Thomas Nelson invented this cheap way of multiple printing from a number of identical lithographic stones. The process was an attempt to compete with the increasing popularity of topographical photography. The process involved inking the steel plate with a wax-based ink, and then printing that onto several lithographic stones, so that multiple copies could be printed at one go, after which the woodblock was inked in blue and printed the sky.