Abstract: Unit for thermal incineration of non-explosive gases with minor amounts of organic pollutants and for production of hot air, and which can be adapted to various types of supplementary fuel. There is a combustion chamber which consists of a flame pipe inside an outer jacket. Through the space therebetween, incoming process gas is led as coolant. At its front end, the combustion chamber has a burner for supplementary fuel and a mixing-in zone for process gas. The process gas rapidly mixes with the hot combustion gases in the flame, the gas reaching its reaction temperature directly. Powerful turbulence in the mixing-in zone gas, film-layer cooling, convective cooling and even flow give highly efficient and pure combustion while keeping the flame pipe temperature low enough to prevent corrosion.

Abstract: The invention relates to a device intended to facilitate play on a musical string instrument by transfer of the notes for a tune to be played from the conventional note sheet onto a note sheet where the tones are indicated so as they are to be found at predetermined places on the individual strings of the instrument by the fingers of the hand acting on the strings. The device consists mainly of a preferably rectangular, flat, elongated slotted slider and a preferably rectangular, flat, elongated slide member housed in the slot so as to allow mutual sliding displacement. The slide member is provided with longitudinally extending parallel rows of conventional tone designations by characters, the number of said rows equalling the number of the strings of the instrument. The tone designating characters are in each row positioned according to their subsequent locations on the string.