Galvanometer from prototype Cox selenium-cell magnifier equipment, 1910-1920 Telecommunications 1910-1920
Front side of right kidney showing internal structure from wax anatomical figure of reclining woman Anatomy & Pathology 1771-1800
filings coherer, small glass tube with bulb at one end and cap of red sealing wax at other end, 1898 Radio Communication 1898
Filings coherer, glass tube bent into U-shape at one end with bulb to form side-pocket on mounting bracket with terminals, 1894-1904 Radio Communication 1894-1904
Front wall of right side of heart from wax anatomical figure of reclining woman Anatomy & Pathology 1771-1800