Page "Thomas Edison" Paragraph 31

1879.

He assisted in experiments on the telephone, phonograph, electric railway, iron ore separator, electric lighting, and other developing inventions.

However, Hammer worked primarily on the incandescent electric lamp and was put in charge of tests and records on that device.

In 1880, he was appointed chief engineer of the Edison Lamp Works.

In his first year, the plant under General Manager Francis Robbins Upton turned out 50, 000 lamps.

According to Edison, Hammer was " a pioneer of incandescent electric lighting ".