Abstract: An anti-biofouling casing for a seismic streamer is described, the anti-biofouling casing comprising a polymer system comprising a hydrophobically-modified base polymer, the hydrophobically-modified base polymer comprising a base polymer having a backbone and a hydrophobically derivatized chain extender coupled to said backbone of said base polymer, wherein the the hydrophobically derivatized chain extender comprises a hydrophobic moiety. The anti-fouling casing comprises a hydrophobic surface the serves to prevent biofouling of the surface.

Abstract: An anti-biofouling casing for a seismic streamer is provided, the casing comprising an outer-skin, the outer skin comprising a mix of a base material and a molecular additive, wherein the molecular additive is localized throughout the base material and the molecular additive is configured to impart a high contact angle and/or a low surface energy to an outer surface of the anti-biofouling casing to prevent adhesion of living organism thereto. The outer-skin may comprise a casing/skin for a seismic streamer such that the streamer skin comprises a base material with a hydrophobic molecular additive distributed throughout the streamer skin.

Abstract: A bricklayer's combination level and plumb having a first I-section beam, a second I-section beam, and a connector pivotally and slidably connecting the second I-section beam to the first I-section beam wherein the second I-section is angularly displaceable up to and including a right angle relative to the first I-section beam.

Abstract: A bricklayer's combination level and plumb having a first I-section beam, a second I-section beam, and a connector pivotally and slidably connecting the second I-section beam to the first I-section beam wherein the second I-section is angularly displaceable up to and including a right angle relative to the first I-section beam.