Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity (1854)
Davis, Daniel · Boston : Palmer and Hall · leaf 62
GA I. VANO—DECOMPOSITION. 45 … 30 represents a tumbler divided vertically; with theedges ground together, so as to form a tight joint.Fig. 30. when they include between them a diaphragm of unsized paper.They are held together by ringsof India rubber. A little screw-cup is clamped to the side ofeach of these apartments, fromwhich…