Abstract: A rotary composter includes a rotatable composting drum, a motor for rotating the drum, an aeration system for supplying air to the drum and an open-loop computerized controller for controlling one or both of the motor and the aeration system based on animal growth data. The rotary composter may also have a wireless nitrogen gas sensor for sensing an amount of nitrogen gas in the drum and a load cell for measuring a mass inside the drum to enable the controller to further control one or both of the motor and the aeration system based on signals from the nitrogen gas sensor and the load cell.

Abstract: A rotary composter includes a rotatable composting drum, a motor for rotating the drum, an aeration system for supplying air to the drum and an open-loop computerized controller for controlling one or both of the motor and the aeration system based on animal growth data. The rotary composter may also have a wireless nitrogen gas sensor for sensing an amount of nitrogen gas in the drum and a load cell for measuring a mass inside the drum to enable the controller to further control one or both of the motor and the aeration system based on signals from the nitrogen gas sensor and the load cell.

Abstract: An apparatus for replacing a selected sign on a web with a replacement sign is disclosed. The apparatus includes a first replacement roller for storing the replacement sign and a second replacement roller for receiving the selected sign. The second replacement roller is capable of moving the web to remove the selected sign and to insert the replacement sign. A method of replacing a selected sign on a web with a replacement sign is also disclosed.

Abstract: A scrolling sign apparatus is disclosed. The apparatus includes a web having a number of signs connected in a loop. The web includes a bead along each longitudinal edge thereof. The apparatus includes a housing which has a window for displaying the signs. The web is wound on a number of rollers located in the housing which advance the web through the window. Each roller has two circumferential grooves located near the ends of the roller. The grooves engage the beads along the edges of the web.