Need more context or a picture
The steam engine as it was to be used in many machines such as trains, steamboats, factories, farming equipments, etc.
By a boat I am pretty sure
The expert testimony of forensic scientists are convincing because they use state of the art and cutting edge methods to determine different factors which is their job. They are able to tell, based on a fingerprint, to whom this fingerprint belonged, given that these people have the fingerprints in the first place in a database.
