Abstract: A moisture control system for use on a clay tennis court is disclosed. The moisture control system uses moisture sensors that are buried within the clay court playing surface along with an electronic control module and corresponding software to energize electronic water valves as needed for each end of the court (or zone) so that the moisture level within the clay playing surface is maintained within user-specified controlled limits. Water flow sensors that are connected to each water valve provide the user with current flow rate measurement, thus allowing the user to adjust the flow rate on each water valve as needed. The control module includes an LCD display as well as two-way Wi-Fi communication with a mobile wireless communication device such as a smart phone.

Abstract: A beam-type axle suspension system particularly applicable to trailers and which is subject to torsional forces includes an elongated beam, a pneumatic bellows located on the beam, a hanger bracket located at one end of the beam, a connection for rigidly connecting the beam to the axle and a resilient pivot connection for resiliently connecting the beam to the hanger bracket wherein the beam includes an orifice through which the axle is slid or pressed and rigidly attached thereto, thereby preventing the axle from assuming a cross-sectional shape substantially different from its unstressed shape due to the torsional forces imposed on the axle. This beam-type axle suspension system also includes a resilient pivot connection for connecting the hanger bracket to the beam, thereby allowing the brake components to be attached to the beam instead of to the axle, and having the effect of eliminating stress risers on the axle due to welding the brake components to the axle.