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CONNUNICATIONS RECEIVED. VALUE OF PATENTS How to Obtain Them. Practical Hints to Inventors. How Can I Best Secure My Invention 7 Preliminary Examination. To Make an Application for a Patent. Foreign Patents. Trademarks. Design Patents. Copies of Patents. ington D. C. Advationntnio. Grinder latest and best invention. Only $8.00. L. H. RUSSELL Stratford Conn UV it or f orf eft $500. New articles areJust pat ented. Samples sent free to all. Address 1E53030 PHOTOGRAPHIC APPA RATIIS tk CHEMICALS 'One of our firm who has had a large experience with Order a Wheel and try it. Wood-Working Machinery. Patent Scroll Saws and Band Saws a Specialty. OVE ki 500 id A.CH I NES IN USE. Medal at Cincinnati Indus The Scientific American REFERENCE BOOK. pages illustrated with engravings and forming one of the cheapest and most valuable books of condensed re ference ever printed. Among its contents are Territories and Counties in fulishowing also the area of the several States. cupations of the people of the United States and the number of persons engaged in each occupation. Com piled from the last Census. piled from the last Census. With Directions How to Obtain Patents Official Rules Caveats; Forms for Assignments. in whole and part; Rights cr Employers and Employees in respect to In ventions; State Laws concerning Patents. ing the Trade Mark Law in full with Directions for Registering Trade Marks Costs etc. full. With Dire ction 5 hap ensee etc. scribed and illustrated by 150 small diagrams of great value to Inventors and Designers of Mechanism. illustrations. showing all the parts names etc. and a brief history lating the Horse Power of Steam Engines and Streams of Water. Weight; Apothecaries' Weight; Avoirdupois or Com ard; Dry Measure; Land Measure; Cubic Measure; Liquid Measure; French Square Measure; French with engraving of a section of the English. and a sec 12. Valuable Tables: (1) Table of the Velocity and Force of the Wind. bic toot and Cubic inch of the principal substance