lower sphere clamp
/ˈləʊə ˈmantəl/
n
English · lower sphere clamp中文 · 下球夹Español · abrazadera inferiorFrançais · bague inférieure de blocage de la sphère
意味：Two clamps secure the glass sphere into the position required to obtain an exact measure of sunshine; this position is based on the coordinates of the meteorological station.