Abstract: A portable thermal oven includes a metal frame and a plurality of terracotta panels disposed inside of the frame and defining an enclosed chamber having a front panel, a rear panel, two opposite side panels, a top panel and a bottom panel. The furnace also includes a terracotta door hingedly disposed in the front panel and including a handle on one side thereof for opening and closing the door. A plurality of gas manifolds and a plurality of gas burners are disposed on each of the two opposite sides of the chamber and a ventilation hatch is disposed in the top panel for exhausting fumes and excess heat. A first and a second gas cylinder and pipes for connecting the gas cylinders to the manifolds for supplying gas and/or air to the manifolds are also provided.

Abstract: A portable thermal oven includes a metal frame and a plurality of terracotta panels disposed inside of the frame and defining an enclosed chamber having a front panel, a rear panel, two opposite side panels, a top panel and a bottom panel. The furnace also includes a terracotta door hingedly disposed in the front panel and including a handle on one side thereof for opening and closing the door. A plurality of gas manifolds and a plurality of gas burners are disposed on each of the two opposite sides of the chamber and a ventilation hatch is disposed in the top panel for exhausting fumes and excess heat. A first and a second gas cylinder and pipes for connecting the gas cylinders to the manifolds for supplying gas and/or air to the manifolds are also provided.

Abstract: A combined set of interacting instruments for constructing and analyzing mathematical figures includes a ruler, an adjustable triangle assembly, a compass and a protractor. The ruler includes an elongated strip of rigid or semi-rigid plastic having a length, width and relatively thin thickness. A pivot point is provided in a general middle portion of the ruler together with three parallel longitudinally extending guideways along portions of the ruler. One of the guideways includes a positioning hole for a writing instrument to act as a compass. The triangular assembly includes two moveable elements having first and second ends with the two elements pivotally connected together at one end of each of the elements so they can be disposed in an end to end relationship. The moveable elements also have a guide follower that fits within one of the guideways in the ruler.

Abstract: A combined set of interacting instruments for constructing and analyzing mathematical figures includes a ruler, an adjustable triangle assembly, a compass and a protractor. The ruler includes an elongated strip of rigid or semi-rigid plastic having a length, width and relatively thin thickness. A pivot point is provided in a general middle portion of the ruler together with three parallel longitudinally extending guideways along portions of the ruler. One of the guideways includes a positioning hole for a writing instrument to act as a compass. The triangular assembly includes two moveable elements having first and second ends with the two elements pivotally connected together at one end of each of the elements so they can be disposed in an end to end relationship. The moveable elements also have a guide follower that fits within one of the guideways in the ruler.