Abstract: A device for contactless testing of structural and/or surface defects of large-surface bodies, especially of slab-shaped materials includes a conveying device with an unsupported area; a source of heat arranged above the plane of conveyance and extending transversally to the direction of conveyance and which radiates heat in lines or strips onto the plane of conveyance; a thermographic camera having at least one camera line aligned transversally to the direction of conveyance and arranged above the plane of conveyance and after the source of heat in the direction of conveyance; and a computer connected to the camera that has a monitor and generates a separate heat image pattern from every camera line.

Abstract: A device for contactless testing of structural and/or surface defects of large-surface bodies, especially of slab-shaped materials includes a conveying device with an unsupported area; a source of heat arranged above the plane of conveyance and extending transversally to the direction of conveyance and which radiates heat in lines or strips onto the plane of conveyance; a thermographic camera having at least one camera line aligned transversally to the direction of conveyance and arranged above the plane of conveyance and after the source of heat in the direction of conveyance; and a computer connected to the camera that has a monitor and generates a separate heat image pattern from every camera line.

Abstract: The invention relates to a sound body for a stringed instrument, having an upper backframe (6) designed as a frame, to which a soundboard (4) is adhesively bonded, and on which there are provided at least one bridge (8) extending approximately diagonally and a cast frame provided with a set of strings, and having a lower backframe which is arranged under the upper backframe (6) and is connected thereto. In order largely to maintain the once predefined tuning, even during fluctuations in the climatic conditions in a room, the invention proposes that the upper backframe (6) be connected to the lower backframe (16) only in its diagonally opposite connection regions (18a, 18b) facing the ends of said bridge (8), but have a clear spacing from the lower backframe (16) in the remaining edge regions (12a, 12b).