A sealed Bourdon tube responsive to externally applied pressures for effecting displacement within operating ranges correlated to the magnitude of pressure being applied. Preconditioning of the Bourdon tube includes a permanent fluid fill with an incompressible liquid of controlled volume corresponding to the decreased internal tube volume when the tube is subject to application of a predetermined overpressure. The confined fluid thereafter presets an overload limit beyond which the tube cannot ...

An N.sup..alpha., N.sup.G, N.sup.G -trisubstituted arginine is prepared by treating arginine with a benzyl carbonate or a p-methoxy-benzyl carbonate in the presence of a silylating agent and an amide solvent, and treating the resulting product with a lithium salt of an acid having a pK of from about 4 to about 6 and in the presence of an alcohol.

A fluid to fluid heat exchanger in which facial surfaces of the heat exchanger are defined by headers forming drained leak chambers in such separating relation to different flowing fluids as to obviate mixing of a leaked fluid with another fluid in the event of joint failure or the like.

An SCR type switch is connected to short-circuit the control current of the protected semiconductor device when the load current of the latter, which also passes through a sensing resistor, exceeds a maximum permissible value. Several devices can be protected by the same SCR. Reset requires interrupting the current supply to the SCR. The circuit is suitable for motor vehicle electronic controls. A modification provides temperature compensation.

A protected screen vent apparatus including an inverted cup with a downwardly extending side wall and a bottom opening. A tapped member extends between portions of the side wall to engage a nipple which extends downwardly through the bottom opening to the container or other structure being vented. The tapped member is spaced from other portions of the side wall to form ventilation passages therebetween extending from above the tapped member to the bottom opening. A perforate screen is vertically...

A stake of channel shaped cross section adapted to be driven into the ground directly adjacent to the exterior of a building to which telephone service is to be supplied, with the open side of the channel facing and covered by the building. A plate secured to the upper end of the stake has a telephone circuit protector secured to its front. The end portion of a buried service cable adjacent to the building is led up through the enclosure provided by the stake in cooperation with the exterior of ...

A railway crossing protected against impact shock from cars having skewed trucks; an elongated guide rail is positioned ahead of the crossing, spaced from the crossing by at least one full standard rail length, to straighten the wheels of all cars entering the crossing. The guide rail has a long entrance taper to reduce impact shock, and the traffic rails between the guide rail and the crossing are boxed to transfer truck-straightening forces to the roadbed and not to the crossing.

A radioactive isotope capsule is disposed in a container (heat shield) which will have a single stable trim attitude when reentering the earth's atmosphere and while falling to earth. The center of gravity of the heat source is located forward of the midpoint between the front face and the rear face of the container. The capsule is insulated from the front face of the container but not from the rear surface of the container.

The present invention is directed to protected thiol analogs of pyrimidine bases for syntheses of DNA and RNA by chemical or enzymatic methods. The subject analogs include reagents suitable for DNA or RNA synthesis via phosphoramidite, H-phosphonate or phosphotriester chemistry as well a reagents suitable for use by RNA and DNA polymerase, including thermostable polymerases employed by PCR or other nucleic acid amplification techniques. The nucleotide analogs synthesized by methods of this inven...

An improved fault protected electric power cable is disclosed. In the improved fault protected electric power cable, there are at least two insulated power conductors and an uninsulated ground conductor wherein the ground conductor and the insulated power conductors are all in electrical contact with a conductive polymer composition. If an electrical fault occurs in one of the power conductors the conductive polymer composition will carry the current to the ground conductor.