Abstract: An apparatus for depositing electrostatically and magnetically responsive particulate matter on a conductive surface having an electrostatically charged latent image comprises an elongate permanent magnet that is disposed adjacent to the conductive surface and that is capable of producing a magnetic field having a region of concentrated magnetic flux that permeates the surface and also a region of dilute magnetic flux that is inclined and generally adjacent to the surface, a hopper for storing the particulate matter, and a channel connected to the hopper disposed in the region of dilute magnetic flux having two opposite converging walls that terminate adjacent to the conductive surface in the region of concentrated magnetic flux. The particulate matter when introduced to the region of dilute magnetic flux is caused to be moved by magnetic forces and gravitational forces from the region of dilute magnetic flux to the region of concentrated magnetic flux.

Abstract: A marking device has a cylindrical housing journalled to an extended arm. The cylindrical housing has an outer peripheral surface whose circumference preferrably corresponds to a standard linear distance that is normally encountered in the building industry. The peripheral surface has at least one marking element extending radially from it so that as the cylindrical housing is rotated over a workpiece, the marking element leaves a mark on the workpiece that serves as a centerline measurement for the accurate alignment and placement of building components on the workpiece. The extended arm of the device includes a movable guide that may be extended radially beyond the peripheral surface of the cylindrical housing for guiding the marking device as it is moved along the workpiece or that may be retracted radially from its extension beyond the peripheral surface so that the marking device may be used on an extended planar surface without the guide interfering with the travel of the device over the planar surface.

Abstract: A unitary drier for use in drying the under portion of an automotive vehicle having a vertically disposed forced air inlet duct, a source of forced air in cooperative association with the air inlet duct, means for heating the source of forced air to a predetermined temperature, and a horizontally disposed forced air dispersing duct connected to the air inlet duct that is capable of being placed underneath the automotive vehicle. The dispersing duct has a plurality of uniformly arranged forced air discharge means to discharge a uniform array of heated air to the under portion of the automotive vehicle whereby moisture is removed from the under portion of the automotive vehicle by the force of the heated air impinging on the under portion and by evaporation.

Abstract: An apparatus for depositing electrostatically and magnetically responsive particulate matter on a conductive surface having an electrostatically charged latent image comprises an elongate permanent magnet that is disposed adjacent to the conductive surface and that is capable of producing a magnetic field having a region of concentrated magnetic flux that permeates the surface and also a region of dilute magnetic flux that is inclined and generally adjacent to the surface, a hopper for storing the particulate matter, and a channel connected to the hopper disposed in the region of dilute magnetic flux having two opposite converging walls that terminate adjacent to the conductive surface in the region of concentrated magnetic flux. The particulate matter when introduced to the region of dilute magnetic flux is caused to be moved by magnetic forces and gravitational forces from the region of dilute magnetic flux to the region of concentrated magnetic flux.