I believe I will go on a short tangent tonight. These are the works of Hans Gude 1825- 1903. Hans was a respected teacher at the Dusseldorf Academy. For almost fifty years Gude was a respected teacher at various art academies around Germany. He is best known for mentoring young Norwegian painters but I suppose he influenced young Americans as well.
Gude was a Norwegian himself and not a German, but he became the professor of landscape painting at the Academy at Dusseldorf. However he was a teacher at the Academy beginning in the early 1840's. The paintings on this page are later than that, but they look a lot like American luminist painting, on which he must have been an influence.
Below is a Sanford Gifford that looks similar to the Gudes.
Here is a Kensett that looks similar.
Gude also worked from sketches outdoors and encouraged his students to do so. He moved on from Dusseldorf and taught in other academies, ultimately moving to Berlin. At the end of his career Paris had eclipsed the German academicians.