The middle 19th century saw continued growth and diversification of Newark's industrial base. The first commercially successful plastic — Celluloid — was produced in a factory on Mechanic Street by John Wesley Hyatt. Hyatt's Celluloid found its way into Newark-made carriages, billiard balls, and dentures. Dr. Edward Weston perfected a process for zinc electroplating, as well as a superior arc lamp in Newark. Newark's Military Park had the first public electric lamps anywhere in the United States. Before moving to Menlo Park, Thomas Edison himself made Newark home in the early 1870s. He invented the stock ticker in the Brick City.