Abstract: This comprises a lightweight support for books and magazines comprising a baseboard which seats on the lap of the user or other substantially horizontal surface, and a book plate which is adjustable to a desired angular position relative to the baseboard. A particular feature is a tensioning mechanism for holding the pages in place which comprises a line anchored between an adjustable spool at one end and a detachable elastically-biased hook at the other end, which functions to hold the center of the reading material relatively perpendicular to the reader's line of sight.

Abstract: The rotary combustion bed has a rotary drum with a permeable refractory lining through which air is blown during rotation of the drum and cascading of a charge of material in the drum. The air may flow upwardly through the material at a predetermined fixed angle over an angle through which air is blown into the charge.

Abstract: The rotary combustion bed has a rotary drum with a permeable refractory lining through which air is blown during rotation of the drum and cascading of a charge of material in the drum. The air blown into the drum can be controlled to blow through various angular sections of the drum.