Mr. James S. Gilliam, of Petersburg, Va., writes to us that he is desirous of purchasing some of the best washing machines that were ever invented. Mr. G. writes that he is the keeper of a large hotel, and desires machines that will do work on a large scale. We can do no better than to advise each of the three hundred washing machine patentees to address Mr. G. a letter setting forth the merits of their respective inventions.