Abstract: Disclosed is a device and method for measuring pressure inside a deformable vessel containing a compressible gas, by the transfer of pressure inside the vessel to a primarily rigid chamber external to the vessel through a flexible membrane covering a window in the chamber, which is filled with a suitable incompressible fluid. The pressure transfer is effectuated by either pressing the vessel against the chamber or the reverse. The transferred pressure is then measured by a traditional gauge or other available pressure sensor. Depending on the elasticity of the vessel exterior wall, a fixed area for compressing a flat area of the vessel exterior wall and transfer membrane is chosen. At this chosen amount of deformation, the pressure differential between the vessel interior and the exterior chamber is zero, facilitating the external measurement of the vessel internal gas pressure.

Abstract: A cylindrical pulley over which a belt or web is looped is composed of a series of flat, annular discs, each of which rotates about its own individual axis, all discs closely adjacent to its neighbors so that the aggregate of discs forms the cylindrical pulley. All rotating disc axes are parallel and all are inclined at a chosen angle to the aggregate pulley axis creating a belt contact surface that moves laterally as well as peripherally. All discs revolve about bearing carriers that are rotated together in outboard bearings to change the orientation of the angled discs with respect to the traveling belt. Thus a belt wrapped about the pulley can be made to move in a direction perpendicular to its travel direction at a rate defined by the degree to which the individual discs deviate from the aggregate pulley axis. More importantly the belt can be made to reverse its direction of lateral travel by opposite positioning of the disc carrier group for which purpose several operating means are shown.