Abstract: A method of erecting an acoustic shell for stage performances, the shell have frame defining a concave volume that is curved in two orthogonal planes and has an inner surface facing forwardly of a stage for a performance. A plurality of polygonal acoustic panels are positioned in the frame and spaced in rows and column along the inner surface, each panel having an outer acoustically active surface. The frame is formed of plural curved trusses each with a base for support on the stage and a peak. An oculus ring is connected to the peak of each arch and the bases of the arches are space along a bottom curve of the concave volume. The panels comprise plural adjacent blocks in rows and columns, each with a base and inner closed end, the length of each block being different for adjacent blocks.

Abstract: A method of erecting an acoustic shell for stage performances, the shell have frame defining a concave volume that is curved in two orthogonal planes and has an inner surface facing forwardly of a stage for a performance. A plurality of polygonal acoustic panels are positioned in the frame and spaced in rows and column along the inner surface, each panel having an outer acoustically active surface. The frame is formed of plural curved trusses each with a base for support on the stage and a peak. An oculus ring is connected to the peak of each arch and the bases of the arches are space along a bottom curve of the concave volume. The panels comprise plural adjacent blocks in rows and columns, each with a base and inner closed end, the length of each block being different for adjacent blocks.

Abstract: An acoustic shell for stage performances has a frame defining a concave volume that is curved in two orthogonal planes and has an inner surface facing forwardly of a stage for a performance. A plurality of polygonal acoustic panels are positioned in the frame and spaced in rows and column along the inner surface, each panel having an outer acoustically active surface. The frame is formed of plural curved trusses each with a base for support on the stage and a peak. An oculus ring is connected to the peak of each arch and the bases of the arches are space along a bottom curve of the concave volume. The panels comprise plural adjacent blocks in rows and columns, each with a base and inner closed end, the length of each block being different for adjacent blocks.

Abstract: A constant temperature anemometer is disclosed. The anemometer includes electrically conductive pins including a first set of pins and a second set of pins. A conductor is coupled to the electrically coupled pins. A current source is configured to provide a current through the conductor between the first set of pins. A voltage sensor is configured to measure the voltage across the conductor between the second set of pins. The current source and voltage sensor are configured to maintain a constant resistance of the conductor between the first set of pins.

Abstract: A constant temperature anemometer is disclosed. The anemometer includes electrically conductive pins including a first set of pins and a second set of pins. A conductor is coupled to the electrically coupled pins. A current source is configured to provide a current through the conductor between the first set of pins. A voltage sensor is configured to measure the voltage across the conductor between the second set of pins. The current source and voltage sensor are configured to maintain a constant resistance of the conductor between the first set of pins.

Abstract: A constant temperature hot-conductor anemometer includes a set of electrically conductive pins including a pair of inner pins and a pair of outer pins. A conductor is electrically and mechanically coupled to the pins. A current source is coupled to the inner pins. The current source is configured to provide a current through the conductor between the inner pins. A voltage sensor is coupled to the outer pins and configured to measure a voltage across the conductor between the outer pins. The current source and voltage sensor are configured to maintain a constant resistance of the conductor between the inner pins. In an example, a second set of pins, a second conductor and a second circuit are also used to measure dynamic temperature of a fluid and also to calibrate resistances at a known ambient temperature.

Abstract: A constant temperature hot-conductor anemometer includes a set of electrically conductive pins including a pair of inner pins and a pair of outer pins. A conductor is electrically and mechanically coupled to the pins. A current source is coupled to the inner pins. The current source is configured to provide a current through the conductor between the inner pins. A voltage sensor is coupled to the outer pins and configured to measure a voltage across the conductor between the outer pins. The current source and voltage sensor are configured to maintain a constant resistance of the conductor between the inner pins. In an example, a second set of pins, a second conductor and a second circuit are also used to measure dynamic temperature of a fluid and also to calibrate resistances at a known ambient temperature.