# Westinghouse lights the World’s Columbian Exposition with Tesla’s alternating-current system

Date: 1893

## The fact

In 1893 Westinghouse used [Tesla](/people/nikola-tesla)’s alternating-current system to light the World’s Columbian Exposition in Chicago. Tesla presented demonstrations. It is a dated fair installation, not a national grid.

## Context

The fair was a publicity and engineering contest with General Electric’s camp. Success there fed the Niagara contract. Unnamed Westinghouse shop men ran the plant. Sharing is not a reason to drop Tesla’s patents from the file.

Nikola Tesla is not the sole author of every later object, law, or museum label that uses the name. Shared work with courts, excavators, printers, spouses, officials, and later states does not erase a documented role, and it does not make an ancient person the signer of a twentieth-century statute.

## Evidence and sources

IEEE/ETHW’s Tesla page and Smithsonian’s current-war essay independently date Westinghouse/Tesla AC at the 1893 fair.

Official or archival record: Engineering and Technology History Wiki — Nikola Tesla (https://ethw.org/Nikola_Tesla; IEEE / ETHW).

## Significance

Public-proof path for an energy standard. High confidence on the fair lighting.

A fair is not Niagara. Keep 1893 and 1895 on separate rows.

## What is established and what is not

Established: Westinghouse AC lighting at the 1893 Columbian Exposition using Tesla-system apparatus. Not established: that Tesla personally installed every lamp, or that DC vanished that summer.

What would change the picture: a contradictory original with a different date or name, or a measured series that can be argued, with lag and alternatives, as a consequence of this instrument rather than of later institutions.

The date is the date of this instrument, not a licence to back-date every later harm or benefit.

## People

- Nikola Tesla: https://factrail.ai/people/nikola-tesla

## Drivers

- Social Cohesion: https://factrail.ai/drivers/social-cohesion

## Sources

- https://ethw.org/Nikola_Tesla
- https://www.smithsonianmag.com/history/how-edison-westinghouse-and-tesla-battled-over-electricity-120438080/

## Methodology

https://factrail.ai/methodology

Canonical: https://factrail.ai/facts/us-tesla-chicago-exposition-1893