Editing 1778 in science (section)

==Technology==
* [[Joseph Bramah]] [[patent]]s an improved design of [[flush toilet]] in [[London]].<ref>{{cite book|last=Williams|first=Hywel|title=Cassell's Chronology of World History|url=https://archive.org/details/cassellschronolo0000will|url-access=registration|location=London|publisher=Weidenfeld & Nicolson|year=2005|isbn=0-304-35730-8|pages=[https://archive.org/details/cassellschronolo0000will/page/331 331–332]}}</ref>
* The brothers [[Grubenmann|Hans Ulrich]] and [[Johannes Grubenmann]] complete a bridge across the [[Limmat]] at [[Wettingen]] in [[Switzerland]], a 60 m span which is the first known use of a [[true arch]] in a [[timber]] bridge.<ref>{{cite book|first=Leonardo Fernández|last=Troyano|title=Bridge Engineering: a Global Perspective|url=https://books.google.com/books?id=0u5G8E3uPUAC&q=Wettingen+bridge+1778&pg=PA159|publisher=Thomas Telford Publishing|location=London|year=2003|isbn=0-7277-3215-3|pages=158–9|accessdate=2011-08-16}}</ref>