A `once-through` boiler which is provided with a water storage drum connected to the boiler inlet and carries a head of water sufficient to maintain a supply of water to the tubes in the event of failure of external water supply to the boiler.

A slip-through watchband buckle in which one end of the band is pivotally secured to the buckle cover at a location between the free end of the cover and the other end of the cover which is mounted on the sides of the buckle base for pivotal movement between an open position away from the base and a closed position over the base and for sliding movement in its closed position between a locked position and a released position. After the tongue has been slipped through the buckle over the base to ...

A volatile fluid is transmitted through a pipeline containing a series of check valves by differential heating along contiguous sections of the pipeline to create a decreasing temperature gradient and a consequent decreasing pressure gradient in the direction of desired transmission to thereby cause fluid flow in a desired direction, the check valves preventing the reversal of fluid transmission upon reversal or discontinuance of the temperature gradient. In long pipelines, the differential heat...

A lead-through device insertable in holes drilled in a concrete floor and the like for leading cables or wires from below to above the floor of a building structure which protects the cable or wires from contact with the concrete and has a resilient hood which extends above the floor a short distance to protect the wires or cable.

This specification describes a flow-through shifter which is very simple and selectively shifts input digital data a prescribed number of spaces to the right in response to a value represented in a binary control word. The shifter provides a plurality of switching gates which are cascaded. A separate bank of gates is provided for each digit position of the control word, and the banks are cascaded such that the outputs from one bank are applied to the inputs of gates which are to the right of tha...

Failure of casing set in wells drilled through permafrost zones can be anticipated if the casing is set in the usual manner. As the warm formation fluid is produced up through the permafrost zone, the permafrost adjacent the well thaws. In many instances the casing could be damaged by buckling when it loses its lateral support, while the upper termination of the casing moves downward due to subsidence. This problem is relieved by cementing the casing only below the permafrost zone and suspending...

A method and apparatus for separately introducing an auxiliary feedfluid into a shell-and-tube-type vapor generator when the flow of main feedfluid is discontinued. The auxiliary feedfluid provides the vapor for preheating the entering main feedfluid when flow of the latter is resumed thereby reducing temperature differentials between the shell and tube sheet metal and the entering main feedfluid so as to eliminate thermal shock.

The method of cementing a porous subsurface earth formation in which well-casing is set and perforated, wherein a body of cement slurry is displaced through the tubing, and a bridge plug is employed to close off the lower end of the tubing, following displacement of the cement slurry through the perforations.

A air whistle which includes spaced annular plates, a tubular wall connecting the plates and surrounding openings in the plates, and a tubular stem mounted on one of the plates surrounding the opening thereof and extending outwardly thereof. When the whistle is drawn through the air, stem first, it emits a piercing sound.

In a double-ended, or feed-through, connector wherein a pair of connector members are arranged back-to-back, for reception of cable plugs, a pair of preformed covers, such as of plastic, of identical construction having elements symmetrically arranged, and fitted on opposite sides of the connector members, frictionally fitted together, and together enclosing the space between the connector members and the connecting elements in that space.