sentences:  A so-called reliable source was found in a close friend of the Watson family, former head of Kings College Dental Department, dental surgeon John Bell Milne, who claimed to have seen Preston's earliest flying machine, but had not witnessed it in flight.In correspondence with Gibbs-Smith, Bell Milne later described the aircraft as, "...definitely a glider, it had skids.It was of normal biplane build, both wings in the same span.