"The 1.5-million-volt conical Tesla Coil (billed as the most powerful on earth) at Mid-America Science Museum in Hot Springs (Garland County)," the Texas Amateur Geologist says.

"This permanent exhibit, named “Caged Lightning,” was dedicated on November 19, 2002."

"Featuring the World’s Most Powerful Conical Tesla Coil, as recorded in the Guinness Book of World Records," the official website says.

"Audiences are taken back in time when harnessed electricity was new to the world and the competition of Nikola Tesla and Thomas Edison. This show features 1.5 million volts of electricity sparking off the coil and is a fan favorite among children of all ages.

"The show is free to Museum members. Tickets are available at the admissions desk."

"The Tesla Coil stands inside a floor-to-ceiling, 2.5-ton Faraday cage (thus the name Caged Lightning) which is lined with metal screens to protect the Museum's thrill-seeking viewers from being incinerated," the Roadside America says.

"The operator turns a key, a transformer hums to life, and purple bolts of plasma suddenly explode with ear-splitting crackles and crashes, flinging themselves to all corners of the cage, probing for a weak point. It's like a lightning storm inside a cage inside a building. Whooping and cheering audiences are left with a one-of-a-kind memory, the smell of fresh ozone, and a sense of hearing that will probably never be quite as good as when they arrived.

"The Tesla Coil was donated to the museum by Richard Mathias, a retired electrical engineer and a Hot Springs native. He has subsequently given similar Tesla Coils to science museums in places such as Texarkana and Johnson City, Tennessee, but this one in his home town was his first."

"A Tesla coil is an electrical resonant transformer circuit designed by inventor Nikola Tesla in 1891. It is used to produce high-voltage, low-current, high-frequency alternating-current electricity. Tesla experimented with a number of different configurations consisting of two, or sometimes three, coupled resonant electric circuits.

"Tesla used these circuits to conduct innovative experiments in electrical lighting, phosphorescence, X-ray generation, high-frequency alternating current phenomena, electrotherapy, and the transmission of electrical energy without wires.

"Tesla coil circuits were used commercially in spark-gap radio transmitters for wireless telegraphy until the 1920s, and in medical equipment such as electrotherapy and violet ray devices. Today, their main usage is for entertainment and educational displays, although small coils are still used as leak detectors for high-vacuum systems." (Wikipedia)

"Fans of famed inventor Nikola Tesla – as well as all science and technology aficionados – are invited to witness the world’s largest Tesla Coil in action at “Shock the Rock!,” a Tesla-themed, free event on the grounds of the Clinton Presidential Center. “Shock the Rock!” is powered by Entergy and presented by the Museum of Discovery."

"This is the third time Leyh has built the world’s largest Tesla coil, each exceeding its predecessor in height, power and the ability to produce what Leyh calls “lightning on demand.” At “Shock the Rock!” Leyh’s latest world-record coil will be centered on the large concrete pad at the western edge of the Clinton Center grounds cordoned off from the crowd, ensuring zero danger from being on-site to watch the awesome power of 60-foot bolts of lightning," the Museum of Discovery says.

"“The Museum of Discovery debuted our own world record Tesla coil on July 4, 2015, and this bi-polar, musical device has been a staple of the education and entertainment programs at the museum ever since,” says Kelley Bass, museum CEO. “So who better to give Arkansans the chance to view the awesome displays of powerful lightning this 40-foot Tesla tower emits than our museum? We hope thousands of science fans will turn out for this unique event.”

"The museum, which is Arkansas’s oldest and largest science center, is home to the Guinness World Record’s most powerful conical Tesla coil. The coil, which was first invented by Nikola Tesla in the 1890s, is one of Tesla’s most famous inventions. At the museum, visitors can view a caged-lightning demonstration of this coil, which puts out 1.5 million volts.

"The museum will also have discounts on Tesla related educational items in their museum store throughout the weekend. In true birthday spirit, the Tinkering Studio will also house 160 cupcakes and ice cream samples will be available in the Creek Walk Café to celebrate the day," the Arkansas Tourism says.

"Mid-America Science Museum is located at 500 Mid-America Blvd in Hot Springs. Tesla Fest is a general admission event and there are no additional costs to enter the museum. Tesla shows are $3 per person. Admission to Tesla Fest and to the Tesla shows are free to Mid-America Science Museum members."