. The Scientific American reference book; a compendium of useful information for inventors and mechanics, containing the complete patent laws of the United States ... forms for patents, caveats, assignments, licenses, and shop rights ... etc., etc . ile or oilsoap, cut up in small pieces, in three quarters of a pintof water, and boil it for two or three minutes ; thenadd five ounces of glycerine. When cold, this fluidwill produce the best and most lasting bubbles thatcan be blown. LIQUID GLUES. Take of gum shellac three parts, caoutchouc (india-rubber) one part, by weight. Dissolve the caoutch
. The Scientific American reference book; a compendium of useful information for inventors and mechanics, containing the complete patent laws of the United States ... forms for patents, caveats, assignments, licenses, and shop rights ... etc., etc . ile or oilsoap, cut up in small pieces, in three quarters of a pintof water, and boil it for two or three minutes ; thenadd five ounces of glycerine. When cold, this fluidwill produce the best and most lasting bubbles thatcan be blown. LIQUID GLUES. Take of gum shellac three parts, caoutchouc (india-rubber) one part, by weight. Dissolve the caoutchoucand shellac in separate vessels, in ether free fromalcohol, applying a gentle heat. When thoroughlydissolved, mix the two solutions, and keep in a bottletightly stoppered. This glue is called marine glue,and resists the action of water both hot and cold, andmost of the acids and alkalies. Pieces of wood,leather, or other substances, joined together by it, willpart at any other point than the joint thus made. Ifthe glue be thinned by the admixture of eiher, andapplied as a varnish to leather, along the seams is sewed together, it renders tlie joint or seamwater-tight, and almost impossible to separate. 104 THE LAW OP INFBINGEMEWTS. The general rule of law is,that the prior patentee is en-titled to a broad interpretationof his claims. The scope ofany patent is therefore govern-ed by the inventions of priordate. To determine whetherthe use of a patent is an infringement of another, generallyrequires a most careful study of all analogous prior patentsand rejected applications. An opinion based apon suchstudy requires for its preparation much time and labor. Having access to all the patents, models, public records,drawings, and other documents pertaining to the PatentOffice, we are prepared to make examinations, and giveopinions upon all infringement questions, advice as to thescope and ground covered by patents, and direct with vigorany legal proceedings
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