Abstract: A bi-metal control flap for a wood stove is biased to close by gravity and is controlled to open an air inlet when the temperature rises which is opposite to the traditional bi-metal control systems which close when the temperature rises. The valve is a free pivoted L-shaped flap with a first portion and a second portion extending from a pivot position and supported by a casing. The first portion is positioned over an air supply inlet and retained over the inlet by gravity. A crank arm supported by the casing rotates to push against the second portion of the flap to open the flap a predetermined amount, and a bi-metal strip coil having an outer end attached to the casing and a floating inner end attached to the crank arm such that a change in temperature causes the crank to rotate to open the flap or allow the flap to close by gravity.

Abstract: A lock stitch type hand sewing machine comprises a bed and a needle arm pivoted mutually at one end on the bed. The bed is provided with a shuttle and the needle arm is provided with a needle on its free end. The operation of this sewing machine is effected by gripping the bed and the needle arm with one hand to rock them, and according to this operation, the needle and the shuttle are relatively moved to form lock stitch.