| 摘要 |
The beam widener (1) is composed of a padded wooden plate wider than the body of the beam and slightly longer. Webbing (2,2') fastens the enlarger to the beam (5) There are two bands of visual marks (3) along the widener which delimit the actual width of the beam. The widener has a chamfered guide (4) which fits its width more easily to the width of the beam.The webbing is fastened on one side to a stirrup and on the other side to a piece with a notch. To place the widener it is sufficient to house an iron rod in the webbing into the stirrup notch
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