This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Frenchhorn. This is meliphone in the same key as French horn It has three valves like trumpet and no trigger It is heavy like double horn but without the fourth valve it cannot be classified as such The meliphone sounds almost exactly like French horn It plays in the key of Old fashioned french horn single high Bb from en Public