Abstract: A portable fluid heating unit which may be used for supplying warm water to divers which includes a three stage heat exchange system wherein a fluid source, such as sea water, is initially heated as it passes through coils within the heating unit firebox and is subsequently heated in a first heat exchange chamber surrounding the firebox, after which, the fluid is heated by heat exchange with the exhaust gases from the firebox in a second heat exchange chamber. The temperature of the fluid is continuously regulated to insure that the heated fluid being conveyed to a diver is maintained at a substantially constant temperature.

Abstract: An unpressurized heater for water or another liquid includes a shell which may be substantially filled with liquid to be heated and within which is immersed a fire box which delivers hot combustion products through fire tubes above the fire box which are themselves surrounded by the liquid contained in the shell. The fire box may be fired by gaseous, liquid or solid fuel. A secondary heat exchanger or heat exchangers within the shell also immersed in the liquid can receive salt water or other fluid which is heated proportionally to the temperature of the liquid in the shell and is circulated through a diver's suit and is ultimately returned to the sea after warming the diver. Back-up heating elements are included for diver applications along with required controls and instrumentation in dry compartments. Built-in fuel storage tanks complete a self-contained system.

Abstract: A supported melting pot for recovered globules of solder includes a metering valve and feeder tube through which melted solder is delivered in controlled amounts to a die. The die includes separable sections, at least one of which is heated, and is provided with an elongated spiral molding groove. On each use of the apparatus, a spiral solder section having a length as great as twenty feet is produced.

Abstract: A boiler construction is disclosed which eliminates the need for bolting together of internal parts thereby greatly facilitating mass production and rapid assembly procedures. Internal side protectors, in addition to establishing the size of the boiler in the front-to-back direction, serve as support rails for a removable boiler module and as a retainer for fire bricks which are further retained by a firebox grate. Front and back protectors for the boiler interior rest upon the grate support members and are maintained in properly spaced relationship through interfitment with the side protectors. A boiler scraping attachment and boiler tube cleaner are disclosed. A positive releasable retainer arrangement for the slide-in, slide-out boiler module is included.

Abstract: A compact rectangular boiler for hot water heating systems serves as a booster or helper boiler but can be used in some cases as a primary boiler. A boiler power module consisting of fire tubes and a surrounding water chamber is readily removable like a sliding drawer for cleaning and repair, when necessary. Beneath the boiler power module is a sturdy refractory lined fire box for burning wood or other solid fuel including a cast iron grate. Beneath the grate is a readily removable ash receiving drawer or pan. The boiler power module may employ an alternate heating source in the form of an electrical heating element. Forced draft and manual draft arrangements are included.

Abstract: An article crusher comprised of a base plate support having an upstanding member supporting a pivoted lever with a platen carried thereon adapted to be moved within a cylinder mounted on the support plate to crush an article or the like positioned therein, with said cylinder being shaped to facilitate the insertion and removal of the article.