Abstract: A layout square having a handle and two legs that extend away from the handle in the same direction, both perpendicular to the handle. The handle includes a level to allow angular measurements against level, as well as for plumbing and leveling purposes. The legs correspond in width to standard dimensions of construction materials to facilitate the measuring and marking of those dimensions on materials. One leg is marked along its edges with linear and angular measurement marks for measuring and marking lines and angles, and has holes disposed selectively along its length for receiving a marker, such as a carpentry pencil. The other leg is marked with angular measurement marks along its edges and has a window with pitch marks along the edges thereof to facilitate the measurement and marking of angles and pitch.

Abstract: A valve for automatically charging water into a sewer line trap from a water line containing water under variable pressure comprises a case having a longitudinal bore and means for connecting the case in series flow in the water line. A hollow shaft is mounted in the case and extends from the downstream portion a predetermined distance toward the upstream portion thereof. A piston slidably mounted on the shaft divides the bore of the case into an air chamber downstream of the piston and a water chamber upstream. A floating seal is mounted within the water chamber upstream of the piston and hollow shaft. The seal is advanced and retracted with fluctuations of water pressure in the water line. In its retracted position it charges the water chamber with water and compresses the air in the air chamber. In its advanced position, it discharges the water content of the water chamber into the trap, thereby maintaining the water level thereof.