Abstract: A carrier slide is provided for window coverings and includes a main body, at least one vertical roller assembly, and at least one horizontal roller assembly. The main body includes at least one compartment defined therein. At least one vertical hole is defined in an upper end thereof and communicated with the compartment, and at least one transverse hole is defined in the upper side thereof. The vertical roller assembly includes a first roller rotatably received in the compartment. The first roller has a diameter greater than a width of the main body and smaller than a width of a track so as to be in a rolling contact with two inner lateral walls of the track. The horizontal roller assembly includes a second roller rotatably attached to a lateral side of the main body. The second roller is in a rolling contact with the inner face of the bottom wall of the track.

Abstract: A combined aerobic and anaerobic treating method and facility for treating hog wastewater, in which, wastewater flows through six consecutive steps, namely: 1 raw wastewater tank 2 grit removal chamber 3 natural solid-liquid separation device 4 equalization basin 5 aeration tank and 6 final clarifier, and is effectively treated by way of microbiological technology, without adding any chemical precipitatant or coagulant, from highly polluted hog wastewater to qualified effluent for normal discharge. Not only can it help reduce river pollution, but also will be free from secondary pollution by adding chemical additives. An organic fertilizer, which can be directly utilized is a by product.

Abstract: A weighing device includes a housing disposed on an upper end of a post, a displayer disposed on the housing, a piezoelectric element disposed in the housing and having one end located above the opening of the housing, an air bag disposed on a base, a tube coupled to the post and connected to the air bag, and an expandable member disposed on an upper end of the tube for pushing the piezoelectric element when an object is put on the air bag. A signal corresponding to the weight of the object is generated and displayed on the displayer.

Abstract: A student's multi-function protractor for conveniently drawing different geometric figures including a transparent middle plate which fits on the retainment space between an upper base and a lower base. The middle plate is rotatable in the retainment space. The circumferential edge with the middle plate of the upper base has a 360 degree scale. In addition, the middle plate has a plurality of parallel grooves which are scattered on one side from the central point for providing direct drawings. By accompanied with the grooves, scales and the indication elements on the middle plate, the protractor of this invention is used to easily draw different geometric figures.