Any person who has made a new discovery or invention can ascertain, free of charge, whether a patent can probably be obtained, by writing to MUNN & Co.

We also send free our Hand Book about the Patent Laws, Patents, Caveats, Trade Marks, their costs and how procured.  Address

  MUNN & CO.,
    361 BROADWAY, NEW YORK.

Branch Office, 622 and 624 F St., Washington, D.C.