The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
a heavy beam running along the sheer strake inside the frames of a small wooden vessel and connecting the upper ends of the frames. The sockets for rowlocks may be fastened to the sheer clamp of a launch.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.