Tech History Today – Nov. 21

In 1877 – Thomas Edison announced his invention of the phonograph, a machine that could record and play sound.

In 1905 – The Annalen Der Physik published Albert Einstein’s paper, entitled “Does the Inertia of a Body Depend Upon Its Energy Content?” The paper revealed the relationship between energy and mass. You know the relationship as E = mc².

In 1969 The first permanent ARPANET link was established between the Interface Message Processor or IMP at UCLA and the IMP at the Stanford Research Institute.

Like Tech History? Purchase Tom Merritt’s Chronology of Tech History at Merritt’s Books site.