3. Connecting both truck axles with an equalizing lever so that they
acted in sympathy with each other also did much to prevent
derailments on rough trackage.
4. Bissell states in the patent specification that inclined planes
had been previously applied to railroad car trucks. His claim
rested on the application of this device to locomotive trucks.
5. From a sworn statement of G. M. Milligan dated July 2, 1857. This
along with letters, petitions, receipts, and other such material
quoted in this discussion are from the Patent Office papers housed
in the National Archives, Washington, D.C. (hereafter referred to
as Patent Office papers).
6. The _Lebanon_ was a 4-4-0, used in freight service, that had been
built by the New Jersey Locomotive and Machine Company in December
1855.