The drawing is to scale in all three dimensions to aid
construction. F-Front door (the hinges of this door take considerable strain in use, so the bottom board should be cut with
transverse grain, and preferably made of hardwood, to provide a strong attachment). D-Sliding divider separating front
and rear compartments. P-Rear windowpane of clear plastic. B-Back cover (this may be hinged as shown or may slide like
the divider). If painted or varnished, the box should be thoroughly aired in the sun before use. From: Bee lining as a research technique in ecological studies of honey bees. by Visscher & Seeley (1989) ABJ