Abstract: To locate/size contaminants at the surface of a dielectric or semiconductor material, a P-polarized beam of light from a monochromatic solid-state source is disposed specifically at Brewster's angle and focused to form an illuminated quasi-elliptical spot on the surface that produces effectively no reflected or scattered light from the surface. The spot is scanned over the entire surface so as to assure multiple passes of any contaminant through the spot. On each pass through the spot a contaminant will produce scattered light. A novel high numerical aperture reflective or refractive system is disposed above the surface to always view the spot and to collect/redirect the bulk of the contaminant scattered light to a detector. Illumination at Brewster's angle combined with the high numerical aperture scattered light collector/redirector maximizes the signal-to-noise ratio from the detector. These core components are packaged with support subsystems as a uniquely compact and portable apparatus.

Abstract: A load handling attachment for a forklift truck has an upright base, a load engaging platen, and a push-pull assembly connected to the base above the platen. The attachment also includes a device for connecting the base frame to a carriage of the forklift truck to resist forward movement of the base relative to the carriage. The connecting device includes a linearly movable device mounted on a side frame member of the base, the linearly movable device engaging an upright fork portion when in a carriage attaching position.

Abstract: A bus boarder for a wheelchair and its occupant and for the ambulatory impeded, embodies an elevator platform which is mounted within the entrance area at the front of the bus. The floor and the steps at the entrance are removed and a U-shaped reinforcing frame forms a well for the elevator platform. The elevator platform and its operating mechanism are so constructed that the doors open against each side of the entrance opening as originally provided for the bus. The elevator platform is lowerable to the ground or curbstone with the steps folded into a ramp for the wheelchair which is moved thereon by its occupant or an attendant and onto the platform. A fare box is mounted on a pivoted arm which is rotatable horizontally into a well in the bus dashboard, so as not to impede either the vertical motion of the elevator platform, or the maneuvering of the wheelchair thereon. The wheelchair occupant enters the platform backwards if the chair is of extended size, or if of standard size either forward or backward.

Abstract: A bus loader for a wheel chair and for the infirm embodies a platform which is mounted within the entrance area at the front of the bus. A minimum change in the standard bus is achieved by removing the bottom and intermediate steps at the front entrance and mounting the loading mechanism within the resulting recess. The loading mechanism is so constructed that the doors will swing in at each side of the opening in a manner in which they are normally operated. The platform is moved to the ground or curbstone, the wheel chair is moved thereon and retained in position and the platform, wheel chair and occupant is raised and the platform advanced toward the bus driver and lowered upon the floor permitting the wheel chair occupant to drop a fare in the fare box. A rail is provided on the forward and inner sides of the platform so that the physically handicapped and the infirm may stand upon the platform and be raised into the bus thereby reducing the time required for loading the bus.