Abstract: A solar energy collector is disclosed which is comprised of a base and a solar energy absorbing element spaced from the base. The solar energy absorbing element has an accordian-like shape including angularly disposed upper ridges and lower valleys interconnected by generally planar surfaces. The lower valleys are positioned immediately adjacent the base. Fluid supply conduits are positioned between the solar energy absorbing element and the base immediately adjacent the upper ridges. The fluid supply conduits are adapted to supply fluid adjacent the solar energy absorbing element upper ridges which fluid may then flow along the planar surfaces until dropping off the lower valleys onto the base, whereby heat absorbed by the solar energy absorbing element is transferred to the fluid. A trough is provided for receiving the flow of heated fluid along the base.

Abstract: An orthodontic face bow is disclosed which is provided with an improved inner safety wire. The inner safety wire includes at least one end adapted for insertion into a patient-mounted buccal tube and a safety extension associated with the at least one end. The safety extension is formed integral with the inner wire, and protects the patient from accidental contact with the at least one end.