Abstract: The rigid helium balloon has a helium compartment and a separate, channel portion. Helium gas is filled into the helium compartment through a valve in the balloon. Fiberglass rod members are inserted into the channel portion to help retain the desired shape of the balloon. The rod members also provide a counterbalancing weight which prevents the balloon from floating upward. Thus, the balloon, once released into the air, will retain its shape and remain floating at the height from which it was released unless repositioned. No additional weights or tethering devices are required to prevent the balloon from floating upwards.

Abstract: An adjustable book holding device adapted to support one or more groups of books, magazines, file folders, papers or the like in any desired spaced relation along an underlying panel which may be a shelf or tray. The device includes manually adjustable book supports adapted to bear against the outside books in each group. The book supports are longitudinally slidable and self-locking in response to lateral pressure from the books.