Abstract: An ellipsograph structure has first and second arms coupled by pin connections to each other and to a rotatable driving member slidably mounted on a member extending between end supports along a longitudinal axis. A straight line motion mechanism is mounted to one of the end supports for constraining movement of the pin connection between the first and second arms on a straight line along a transverse axis. The straight line motion mechanism includes a pivot member mounted at a fixed pivot point along the longitudinal axis, an extension member in alignment with the longitudinal axis, a swing arm pivotally coupled to the end of the extension member, and a longer guiding arm with one end pivotally coupled to the end of the swing arm and its opposite end pivotally coupled to the pin connection between the first and second arms.

Abstract: A stove suitable for large-burner cooking with a high heat flame has an enclosed stove casing with an upper cooking surface, a hollow interior, and a burner well recessed into the interior of the casing. A large burner is positioned in the burner well, and a cooking vessel can be placed over the well so as to close the burner flame off from the outside. The burner well has an annular rim which can support a wok or other rounded-bottom cooking vessel. The high heat exhaust from the burner is trapped in the well and entrained by natural convection into a duct member to a duct casing at a rear side of the stove which has baffles forming a labyrinthine channel for mixing cold air with the hot exhaust air from the large burner. The stove includes a catch basin member positionable in the interior of the burner well for catching any spillage or debris. The stove casing has a window formed in its front panel for allowing the stove user to visually check the burner flame.

Abstract: A stove suitable for large-burner cooking generating a high heat exhaust has an enclosed stove casing with an upper cooking surface, a hollow interior, and a burner well recessed into the interior of the casing. A large burner is positioned in the burner well, and a cooking vessel can be placed over the well so as to close the burner flame off from the outside. The burner well preferably supports a wok or other rounded-bottom cooking vessel. The high heat exhaust from the burner is trapped in the well and entrained by natural convection into a duct member to a duct casing at a rear side of the stove. The duct casing has a double wall construction and baffles in its interior forming a labyrinthine channel for mixing cold air supplied through openings in the stove casing and the hot exhaust air from the large burner.