Early Coherer, c. 1899
Inventory Number: 17473
Date: c. 1899
Maker Details: Unknown
Inscription: "267" handwritten on paper label upon glass tip. "3/8/99 / nic. & sil. / Busy 1.5 Hours / finest filings / Retested M. 115ft / Reqs hard tap / gd. hard tap / Qo M115ft T66 R4000 / No Jigger R.7000 / sigs 3" handwritten on attached folded paper label.
Size: 110 mm in overall length (excluding end wires)
Materials: Glass, copper, nickel, silver, assorted metals.
Other Given Number(s): Christie's 10.
Early Coherer, relatively fragile, dated 1899. In small, narrow cylindrical glass tube with nickel-plated components, and copper connection wires exiting from each end. Structure appears to be two glass rods tied together side by side, with longer lower glass tube, and with protruding glass tip on upper glass tube. Label would indicate that filings are made of nickel and silver.