Abstract: An optical probe for sensing presence of small moving particles passing through a defined sensing region comprises:i) an emitter optic fiber for transmitting from its tip radiant energy outwardly of the probe;ii) a receptor optic fiber for receiving radiant energy reflected by such particles moving through said sensing region;iii) a lens for focusing radiant energy emitted from the emitter tip into a focal region, spaced outwardly of the probe and which diverges outwardly into a defined high density radiant energy region;iv) the receptor optic fiber defining a diverging viewing region projecting outwardly towards the high density radiant energy region, the receptor optic fiber being positioned relative to the lens to project the viewing region to overlap a useful portion of the high density radiant energy region to define thereby the sensing region. This sensor is particularly useful in monitoring the flow characteristics of catalytic particles in a catalytic reactor for cracking of gasoline constituents.

Abstract: A portable low profile mechanical scale is provided having a carriage with spaced side frames each with wheel means at one end and ground support means at the other end, spacers between the side frames holding them in fixed parallel relation, removable wheeled lift means engaging the side frames adjacent the ground support means for moving the side frames, a pair of torsion bars above said side members at two different parallel levels, one adjacent each side frame and supported thereon by triangular links fixed to the torsion bars at one end and supported on the side members at the other, a weigh bed movable vertically between the side frames and pivoted to the triangular links between the torsion bar and support on the side frames, a lever on each torsion bar adjacent said wheel lift means extending transversely toward each other, one above the other, a link connecting said levers midway between the side frames and a connector on the uppermost lever for connecting to a weight indicating mechanism.