volumescope
Vol*u"me*scope, n. Etym: [Volume + -scope.] (Physics) Defn: An instrument consisting essentially of a glass tube provided with a graduated scale, for exhibiting to the eye the changes of volume of a gas or gaseous mixture resulting from chemical action, and the like. Vo*lu"me*scope, n. [Volume + -scope.] (Physics) Defn: An instrument consisting essentially of a glass tube provided with a graduated scale, for exhibiting to the eye the changes of volume of a gas or gaseous mixture resulting from chemical action, etc.