Abstract: A compact, efficient, self-contained dynamic surface roughness gage includes a staging frame that supports a reciprocatable arm that can be pivoted about an axis perpendicular to a V-shaped working surface at the underside of the frame between releasably fixed positions located 90.degree. apart to facilitate staging the gage on different workpiece configurations. The arm supports a probe comprising a skid and a stylus which is coupled by way of a special flexure to a stereo phonograph cartridge so that only the vibratory motions of the stylus in a direction perpendicular to the nominal plane of the frame working surface are coupled to the transducer. As the probe scans over a workpiece surface with the skid following the same track as the stylus, the two outputs from the transducer are summed to produce a single electrical analog of the vibratory motion of the stylus in that favored direction.

Abstract: Receiving and displaying apparatus is disclosed for receiving a continuously transmitted stream of encoded data messages, whereby selected of the data messages are stored in an updateable, addressable memory having a plurality of locations, one for each of the selected data messages. Each of the data messages has its unique word identifying the nature of the data message. In particular, the receiving and displaying apparatus includes a temporary storage means wherein each data message and in particular, its identifying word is stored and means for comparing the temporarily stored identifying word with the identifying word of each of the data messages as presently stored within the locations of the addressable memory.