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Show TAR AND GRAVEL' APPARATUS : Device Invented by New Jersey Man. ufacturer for Heating Material for Pavement. 1 - Emulating the famous hunter of the olden days who killed two birds with one stone, a New Jersey manufacturer has -recently brought out a combination combina-tion tar and gravel heater that heat these two dlSBlmilar materials quite independently in-dependently but with one operation. The device, which is shown, in the accompanying ac-companying illustration, is particularly fitted for street paving where block pavements with tar joints are laid. The apparatus consists of two main parts, a rectangular tar kettle and a T-shaped gravel bin, with a furnace extending beneath both parts, from one end to the other, The furnace is fired from the gravel end of the device. de-vice. The smoke and gases escape through an ordinary stove pipe In the kettle end. The Inside of the gravel HOT OAStS UNDE. i it' JrT tar Kerne, and 'WkJ w VP OUT OF STACK .' , " 1 KlIlNACf ... Combination Tar and Gravel Heating Device In Operation. heater Is triangular shaped while the outride is made up In steps consisting of perforated metal plates. The Y-shaped Y-shaped top acts as a reservoir bin and the gravel feeds down the, steps and out at the bottom. The perforations in the step plates allow the moisture In the gravel to escape readily as it Is turned into steam by the heat of the fire, thereby making it possible to heat both tar and gravel. Popular Science Monthly. |