A bandwidth reduced teleconferencing system achieving good video presence. The bandwidth reduction is accomplished by dividing the video picture of the camera into segments, by determining the activity level within each segment and by transmitting the signal of each segment with a resolution level which is related to the activity level within the segment. The most active segment is transmitted at highest resolution while other segments are transmitted at lower resolutions.

A cryopump 20 for differentially pumping water vapor and inert gases from a work space comprising a two stage refrigerator 45 in which a radiation shield 32 substantially encloses a second stage cryopanel 40. The radiation shield 32 incorporates a baffle plate 34 which condenses higher condensing temperature gases and restricts passage of low condensing temperature gases through orifices 36 to the second stage cryopanel 40. Backside pumping ports 38 provide a flow path to the second stage refrig...

A photographic objective of reduced size having five lens components of which the 1st and 2nd counting from the front are meniscus lenses of positive powers convex toward the front, the 3rd is a lens of negative power, the 4th is a lens of positive power, and the 5th is a meniscus lens of negative power concave toward the front. The various lens components have characteristics to effect proper aberration correction.

A reduced-shrink chewing gum composition having good film-forming characteristics which is prepared with a relatively high amount of inert inorganic filler and a non-styrene butadiene gum base. The filler material is included as a component of the gum base and as a component added after formation of the gum base.

A reduced impact piston assembly including a cylindrical body with a cavity formed therein and having a cross-bore formed therethrough which intersects the cavity. The cross-bore receives a piston pin which has an exposed intermediate portion aligned with the cavity for attachment of a connecting rod thereto. A wide groove is formed about the outer circumference of the cylindrical body which has its center aligned with the center of the cross-bore. Positioned within this groove are a pair of C-s...

A transmission line having substantially reduced far-end forward wave crosstalk is characterized by a single layer of dielectric material having a thickness chosen to provide a forward wave coupling constant K.sub.F substantially equal to zero. The dielectric layer is located on a ground plane, and has a plurality of signal carrying conductors embedded in it. The thickness H of the dielectric underlayer below the signal carrying conductors is chosen to provide a transmission line having the sele...

The spreading of liquids, e.g., an epoxy resin, on a surface can be prevented or reduced if an inhibitor is added to the liquid. Inhibitors according to the invention have the generic formula [CX.sub.3 --(CY.sub.2).sub.n ].sub.N --R, where X is H or F, Y is H, F, or Cl, n is a number from about 1 to about 12, R is a carboxylic acid, an amide, a substituted amide, an amine, an alcohol, or an ester functionality, and N is 1, 2, or 3 if R is an alcohol or amine functionality, and 1 otherwise. The i...

A gun with a spring-urged thrust hammer which first strikes the firing pin when released by the trigger and then has its forward thrust transferred from the firing pin to the bolt so that the hammer, firing pin and bolt are moving forward the extent of the headspace tolerance to counter recoil as the gun fires. This arrangement is shown applied to a shotgun having a unique barrel and sight.

A fiber insulation application nozzle having a small opening for introducing insulation into cavities through a small opening is provided. The diameter of the body portion of the nozzle corresponds with the diameter of the conventional deliver hose from an insulation blowing machine. The nozzle includes a reducing section tapering to an exit portion having a diameter one-third of the main body. A gas injector tube is introduced along the inside surface of the exit portion of the nozzle and is di...

A plug valve has an actuating stem which is non-integral with the valve plug. The actuating stem is axially movable with respect to the valve plug to compressingly and sealingly engage an external sealing member in response to fluid pressure. The plug wedges itself into sealing engagement in response to fluid pressure.