Keeping the Fair Running after Dark
In 1893, the World’s Columbian Exposition took place in Chicago’s Jackson Park beside Lake Michigan. Its extensive halls, plazas, waterways, and roads needed lighting, while elevators, machine tools, and transport facilities required power. For the organizers, electricity was both an exhibit and infrastructure sustaining this temporary city. For visitors, brightly illuminated buildings and water after nightfall were a directly visible experience.
In his account published the following year, electrical department chief John Patrick Barrett separately described generating equipment, transmission and distribution, incandescent and arc lamps, fountains, and exhibits. Viewed through these engineering responsibilities, the fair’s electrical success depended on coordination among suppliers, wiring crews, operating staff, and lighting designers. A ceremonial press of a switch could not explain the entire process.
One Major Contract and Many Parallel Systems
The Westinghouse Electric and Manufacturing Company secured the consolidated contract for incandescent lighting in the grounds and buildings outside the Electricity Building. Barrett recorded a requirement for 90,000 lamps of sixteen candlepower. This figure describes the contract’s scope and should not be confused with the total number of electric lights at the fair or the number its generating equipment could supply. Exhibitors inside the Electricity Building arranged their own lighting and equipment as well.
General Electric, Western Electric, Brush, Siemens & Halske, and other companies also displayed lamps, generators, motors, meters, and switches. Westinghouse’s responsibility for the main incandescent installation therefore did not mean that one company supplied every lamp or electrically powered device. The fair allowed different systems to operate under broadly comparable conditions, enabling both the public and engineers to observe brightness, regulation, and mechanical operation.
References: [1]
The Complete Route from Steam Engine to Lamp
Steam engines in Machinery Hall transmitted mechanical energy to generators. Westinghouse’s installation included large two-phase alternators, smaller single-phase machines, and exciters. Barrett’s equipment list shows that some were belt-driven by engines, while others were directly driven. Marble switchboards brought generators, instruments, and outgoing circuits together for monitoring and switching.
An important advantage of alternating current was that transformers could change its voltage. Barrett recorded that some power was sent to buildings at around 2,000 volts AC through lead-sheathed cables, then reduced to approximately 105 volts for Westinghouse lamps. Transmission at a higher voltage followed by reduction at the point of use allowed dispersed lighting locations to draw power from centralized generating plant. Insulation, cable connections, protection, and load arrangements therefore became indispensable elements of the system.
The winding arrangement of two-phase generators produced two currents with a phase difference, serving lighting as well as demonstrations of polyphase motors. The AC system thus appeared as cooperation among generating, distribution, and consuming equipment, rather than an abstract name for a current detached from machines and wires.
References: [1]
How Visitors Saw Electricity
The Book of the Fair describes lights arranged along the central plaza, pool edges, flowerbeds, and building cornices, with the dome of the Administration Building also outlined in light. Reflections on the water and searchlights transformed the nighttime scene. Lamp chambers beneath fountains used reflectors and colored screens to give changing colors to jets and spray. Visitors did not need to understand electrical machinery to see light organized into a controllable spectacle.
The Electricity Building made part of the control process visible. Visitors could see motors, instruments, switchboards, and railway equipment, while exhibits associated with Tesla explained how changing magnetic fields could drive machinery. Lighting outside offered a sensory experience; operating apparatus inside provided technical explanation. Together, they brought electricity from experimental demonstrations into a public setting on a larger scale.
A Public Demonstration with Operating Responsibilities
Large-scale lighting also required continuous maintenance. Bancroft recorded a fire hazard caused by burned wiring during an early illumination, contained before it spread by prompt action on site. Such accounts remind us that the dazzling nightscape depended on managing wiring, overloads, and fire risks. A complete installation’s performance also included its ability to handle faults safely.
The exposition expanded public familiarity with AC supply and gave manufacturers a venue to demonstrate their equipment to cities, factories, and power-station owners. It was not the beginning of all AC technology, nor did it make existing DC installations disappear overnight. The significance of 1893 lay in bringing contracts, centralized generation, transformer-based distribution, and extensive lighting into one fairground that had to operate every day, making the scale and uses of an engineering system visible.