Apparatus (10) includes means (14) for exciting at least the fundamental radial circumferential mode of vibration (f.sub.1) and the first harmonic (f.sub.2) thereof, detection means (22) for detecting the vibration and analyzing means (12) for determining the internal pressure by reference to f.sub.1 and f.sub.2.

A receiver for use in fastening membranes of waterproofing material to a concrete wall structure so as to tightly secure the upper edge of the membranes and thereby prevent the upper edge from peeling away from the wall and sagging of the membranes. The receiver is in the form of an elongated member which is fastened to the inside of the concrete forms prior to pouring of the concrete, the receiver extending along the length of the forms at grade level. The elongated member is concave in cross-s...

An anchor plate for embedding in a concrete wall has an extending end pivoted to a bar in turn arranged to overlie the top of a roof framing, the pivotal connection permitting swinging of the bar should the horizontal location of the roof framing be slightly out of alignment with the anchor plate. The bar includes a given pattern of nail holes permitting certain nail holes to be selected so as to effect required securement of the bar to the top of the roof framing and thus securely anchor the ro...

An anchoring bracket for use in attaching substantially parallel boards to a generally transverse member or joist and in spacing the boards generally comprises a rain-spacer side and a joist attachment side. The rain spacer side has a spacing portion for placement on the top of the joist for spacing a board from the joist and an extended portion attached to the spacing portion for extending over the edge of the joist. A board spacer tab, affixed to the rain-spacer side, projects generally perpen...

Apparatus for anchoring slabs, such as natural stone slabs, masonry wall blocks or the like, to an anchorage base, e.g. a building, comprising an angular holder having two spaced struts. Each strut includes a vertical holding leg and a horizontal supporting leg. The struts are arranged perpendicular to the surface of the anchorage base. The struts are braced together and combined with an anchor for anchoring the holder in the base, and a support member for supporting the slabs or the like. The h...

A method of and an apparatus for testing the internal pressure of a sealed container carried on a conveyor belt by striking the container with an electromagnetic pulse thereby causing its wall to vibrate, and to check the internal pressure of the sealed container based upon the frequency of the vibratory sound produced by the sealed container. The vibratory sound is converted to an electrical signal by an electroacoustic transducer and is returned to a container striking device in a feedback pat...

A technique for calculating traveltime of a seismic wave in three dimensional tilted transversely isotropic (3D TI) media includes determining a wave vector, defining a unit vector, calculating an angle of the wave vector from an axis and performing a slowness determination, wherein a unit vector for a symmetry axis is defined as: (cos .phi. sin .theta., sin .phi. sin .theta., cos .theta.); where .phi. represents the azimuth of the symmetry axis measured from the x direction; and, .theta. repres...

A control system coupled to a pressure sensor calibrates the pressure sensor. The control system may measure a plurality of capacitance values at a plurality of corresponding applied voltages to compare the values with a first calibration mechanism generated by sample pressure sensors in a comparison. A final calibration mechanism may be generated by adjusting the first calibration mechanism in response to the comparison. The unknown differential pressure may be applied to a diaphragm of the pre...

Method for processing seismic data. In one implementation, the method includes converting a common midpoint (CMP) gather of seismograms into one or more interferogram common midpoint (ICMP) gathers, generating a semblance spectrum for each ICMP gather, stacking the semblance spectrum from each ICMP gather to generate a combined semblance spectrum and deriving a normal moveout (NMO) velocity profile from the combined semblance spectrum.

A single-piece, nonwelded multiple truss metal hanger connector is presented for connecting first and second supported wood members to a supporting wood member. One of the supported members is oriented at 90.degree. with respect to the supporting member and the other supported member is oriented at a skewed angle. The connector has a flat seat for receiving the supported members and a pair of side flanges which extend perpendicularly upward from opposite side edges of the seat to form a U-shaped...