| 摘要 |
<p>A circular roller (1) turning on a holder (2) with handle (4), carries spacers (5.1-5.3). These project out from the casing of the roller. They are dimensioned such that when rolling on the mass, they penetrate into it, up to the surface of the foundation. In this way the surface of the casing and that of the terrazzo, are held at uniform spacing from the foundation surface. The spacers are annular flanges or annular flange segments. At least three of them are provided, spaced uniformly apart.</p> |
