Nearly time independent measurements of low-absorption coefficients of atmospheric constituents can be made with long-path absorption cells by obtaining short-term averages of transmittance values related to cell mirror reflectivity through rapid changes in the cell pathlength between short and long multipaths.

A multiple-feedback path bandpass/bandreject filter which exhibits a nearly constant Q over a predetermined frequency range, and which is tunable by means of a single variable impedance element is provided. A Thevenin equivalent voltage source is placed in series with the tuning element, wherein the Thevenin voltage is a predetermined constant fractional amplitude of the bandreject output voltage, or its equivalent.

In a semiconductor speech path at least a crosspoint element for forming a unitary matrix is formed on a semiconductor chip. The interconnections between the crosspoint elements and the matrix wirings are made on a ceramic wiring plate. By mounting a plurality of semiconductor chips on the ceramic wiring plate by face-down bonding, unitary matrix arrays are formed and at the same time the whole of a matrix array is formed. A row wiring having first speech path wirings and first selection wirings...

A passive device is taught which diverts radio-frequency electromagnetic energy from an original path to a new path at a 90.degree. angle. The device eliminates the large reflective sheets which characterize prior art devices for the same purpose. The device utilizes a modified Yagii-Uda parasitic array to excite a cross-dipole element which reradiates the energy along the new direction. A particular application is shown for placing the device in or on a wall or the like for unobtrusive diversio...

A recording apparatus having multiple recording devices, each recording device being associated with a separate document feed path, in order to provide simultaneous recording on more than one document for the purpose of increasing effective document recording speed. The recording apparatus also includes driving mechanism for driving the documents along the feed paths, selection means for selecting an appropriate document feed path for each document which is introduced to the recording apparatus,...

An interferometer is provided for producing an interference pattern from light such as laser light which travels along first and second optical paths and at the end of each such path there is a respective fixed mirror for directing light to a common optical path. Means are provided to vary the optical path length of light in the or each first or second optical path to produce an interference pattern in the common optical path, which means comprises a pair of parallel-plane optical flats in accor...

A screen display includes a path context window for displaying a signal path in its entirety apart from the schematic sheets on which the path portions appear. The window contains multiple display portions each graphically displaying a path portion appearing on a separate schematic sheet. The multiple display portions are arranged adjacent to each other to display the entire signal path as continuous. The screen display also includes a path list window and may include view sheet windows each sho...

The present device includes a pair of wires which are located one above the other in a plane that lies parallel and orthogonal to the center lines of a path which a scanning head is going to view, as it travels in a scanning excursion. The wires are held taut and when they are in vertical alignment to the human eye (for convenience as reflected in a tilted mirror) then material to be scanned along a certain path can be centered under what appears to be "one wire" and in this way the scanning hea...

Apparatus is disclosed for construction of a bicycle path on the berm of roadways, or the like, and includes standard components such as rails, runners, shim members and spikes whereby the path can be constructed either on existing berms or as part of new construction projects, and a smooth surface for bicycle travel will be provided by endless runners that have side boundaries defined by rails.

A game apparatus which may be played by two or more players, having playing pieces in the shape of equilateral hexagons for each player and a pre-marked game board having a matrix of contiguous spaces disposed thereon in the shape of equilateral hexagons which accommodate the playing pieces. At least two different types of playing pieces (and as many as three types) may be provided, i.e. offensive pieces and defensive pieces, and optionally hybrid pieces known as offensive-defensive pieces. The ...