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The charge jor Insertion under thla head Ia One Dollar a linefor each insertion; about eight words to a line. Advertieements must be received at puhlicatlon qJfice as early as Thursday morning to appear innext laauB. Curtis Return Steam Trap returns all condensations mto the boiler without waste. CurtiS Regulator Work s, Boston, Mass.doi:10.1038/scientificamerican12121885-378 fatcat:jdykvkgeczemvgsretujgyd7p4