Abstract: An automatic photographic system including a housing, a camera having self developing film mounted within the housing, and electrical circuits within the housing providing visual and/or audible customer use instructions, and wherein the housing is adapted for mounting on a single stand-alone support which includes provision for displaying available accessory items such as photographic holders or frames.

Abstract: A modular fluid storage and heating system is provided which includes a plurality of different, interconnectable tank components of standardized dimensions such as fluid storage tanks, closure caps, and heater assemblies. Each of the tank components is sufficiently compact in size to pass through standard-sized corridors and doorways to permit assembly on site of a fluid storage and heating system configured specifically to the needs of a particular user. Because each of the tank components is of a standard size, fluid storage and heating systems may be constructed from standard-sized rather than from custom-sized components, thereby reducing considerably the expense and time associated with construction of such systems.

Abstract: A water heater is shown which has a water tank having a water inlet, a water outlet, and an opening in a sidewall of the tank. A combustion chamber assembly has a submergible portion which is adapted to be received within the opening in the tank sidewall. The combustion chamber assembly has a mounting flange for detachably engaging a tank mounting flange for mounting the assembly within the tank. The combustion chamber assembly has a plurality of curved fire tubes. Each of the tubes has at least one end which communicates through the mounting flange with the tank exterior. The combustion chamber assembly is removable from the tank by detaching the mounting flanges and sliding the assembly out of the tank opening.

Abstract: A water heater is shown which has a water tank having a water inlet, a water outlet, and an opening in a sidewall of the tank. A combustion chamber assembly has a submergible portion which is adapted to be received within the opening in the tank sidewall. The combustion chamber assembly has a mounting flange for detachably engaging a tank mounting flange for mounting the assembly within the tank. The combustion chamber assembly has a plurality of curved fire tubes. Each of the tubes has at least one end which communicates through the mounting flange with the tank exterior. The combustion chamber assembly is removable from the tank by detaching the mounting flanges and sliding the assembly out of the tank opening.

Abstract: A heat exchanger has a modular construction to create uniformity among several of its components. The heat exchanger utilizes concentric tubes, with one fluid flowing through the inner tube, and the other fluid flowing through the annular space in the outer tube. The inner tube fluid flows back over the outer tube, further exchanging heat, as it is discharged. The heat exchanger includes four cup-shaped modules that nest or slide together. Each module includes a sleeve with a port for one of the fluids. Each module also has a convex portion that slides sealingly into an adjacent module and contains holes for the tubes. The tubes are sealed into the holes in the convex portions, causing each module to define one of the four manifolds necessary for the operation of the heat exchanger.

Abstract: A heat exchanger for heating liquids with other liquids or vapors. An inner flow tube is carried concentrically within an outer flow tube to define an inner passage and also an annular passage. A first manifold directs all of the incoming fluid from one fluid source to either the inner or annular passage. A second manifold directs all of the incoming cooler fluid from the other fluid source to the other passage. A third manifold at the other end of the outer tube discharges the fluid from it so that it does not mix with the inner tube fluid. The outer tube is immersed in inner tube fluid to cause heat transfer through the walls of the inner tube and outer tube.