A gas analyzer is disclosed which provides a dual channel capability for the simultaneous determination of the presence and concentration of two gases in a stream of sample gas and which has a single infrared source, a single sample cell, two infrared bandpass filters, and two infrared detectors. A separator between the filters and detectors prevents interchange of radiation between the filters. The separator is positioned by fitting it in a slot.

The split bolt comprises plural bolt segments having threaded outer surfaces which are brought radially together to render the bolt insertable into a complementary threaded recess, and spaced radially apart to cause the bolt threads to become engaged when an elongated, generally cylindrically shaped wedge member is inserted between the segments to space them into the threaded engagement. The wedge member has plural camming surfaces along the length thereof which engage corresponding camming surf...

Disclosed is a split-bolt having an improved wedge for separating the two bolt sections into threaded engagement within a nut. The wedge can be easily extracted from between the separated bolt segments by grasping generally cylindrical bosses on the wedge. The bosses are also conveniently accessible with a tool when the wedge is tightly bound by the sections, and thus unextractable by hand.

A split nut to enable complete separation of the longitudinal halves from a threaded shank so that they may be re-fitted to any other portion thereof, particularly long threaded shanks, without the necessity of turning the nut in threaded relationship to such selected position. It is particularly useful in the case of rusted threaded shanks involving great difficulty in screw-threading the nut on the rusted threads. A special feature of the present construction of the nut halves is that it enabl...

A split nut is formed from two substantially identical screw-threaded half nuts, each of which has chamfered ends, preferably at about 60.degree. to the axis of the nut, to engage in a conical counterbore of a washer or workpiece. When the split nut is tightened it remains securely in place. Each half nut has side faces extending in radial planes with complementary locating means symmetrically disposed on either side of the central plane of the half nut taken at right angles to the axis, and the...

A split gland having only three parts is described. The gland has substantially the same stability to the relative motion of the constituent half-gland members during the attachment process to a female fitting as have more complicated designs. Ease of manufacture and use result from the reduction in complexity of the present invention.

There is described a track travelling railroad switch tamping machine which has a transversally extending guide frame at its front end and four ballast tamping units one each mounted in individual sub-frames which are mounted on the guide frame. Hydraulic power means are provided to individually move each of the sub-frames with its tamping unit, transversally of the vehicle on the guide frames, independentally of each other sub-frame. Individual hydraulic power devices are provided on each sub-f...

A keyboard includes a plurality of keys associated with alphanumeric characters including the letters A-Z and at least the numbers 1-9. The keys are split into a left side section and a right side section. The left side section is oriented at least partially above the right side section, or the right side section is oriented at least partially above the left side section. A mobile communication device includes the keyboard. A method for inputting alphanumeric characters into a mobile communicati...

A rolling machine for rolling an annular workpiece. The machine includes a mandrel for supporting the workpiece. The mandrel has two co-operating sections separated across its axis and a part of each section is shaped to conform to the rolled profile of a part of the workpiece.

A split collar for surrounding an article comprises two half sections, each having an internal surface configured to engage the article. A pair of grooves surrounds the collar, and a cut-out is provided to form a pair of attachment projections. An elastic member, such as a rubber band or O-ring, is folded in half and one end is placed around one of the projections. The two strands of the folded elastic member are then placed in the grooves and drawn around the two half sections. The other end of...