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, cor.  F and 7th Sts., Washington, D.C.