细节
A vacuum pump;
Magdeburg hemispheres; a pair of discharge forks; a parallel plate machine; a galvanometer; various coils and condensers; a Post Office resistance box; a galvanometer; and other items (A Lot)
Magdeburg hemispheres; a pair of discharge forks; a parallel plate machine; a galvanometer; various coils and condensers; a Post Office resistance box; a galvanometer; and other items (A Lot)