By History.com

On this day in 1980, American oil tycoon Armand Hammer pays $5,126,000 at auction for a notebook containing writings by the legendary artist Leonardo da Vinci.

The manuscript, written around 1508, was one of some 30 similar books da Vinci produced during his lifetime on a variety of subjects. It contained 72 loose pages featuring some 300 notes and detailed drawings, all relating to the common theme of water and how it moved. Experts have said that da Vinci drew on it to paint the background of his masterwork, the Mona Lisa. The text, written in brown ink and chalk, read from right to left, an example of da Vinci’s favored mirror-writing technique. The painter Giuseppi Ghezzi discovered the notebook in 1690 in a chest of papers belonging to Guglielmo della Porto, a 16th-century Milanese sculptor who had studied Leonardo’s work. In 1717, Thomas Coke, the first earl of Leicester, bought the manuscript and installed it among his impressive collection of art at his family estate in England.

More than two centuries later, the notebook–by now known as the Leicester Codex–showed up on the auction block at Christie’s in London when the current Lord Coke was forced to sell it to cover inheritance taxes on the estate and art collection. In the days before the sale, art experts and the press speculated that the notebook would go for $7 to $20 million. In fact, the bidding started at $1.4 million and lasted less than two minutes, as Hammer and at least two or three other bidders competed to raise the price $100,000 at a time. The $5.12 million price tag was the highest ever paid for a manuscript at that time; a copy of the legendary Gutenberg Bible had gone for only $2 million in 1978. “I’m very happy with the price. I expected to pay more,” Hammer said later. “There is no work of art in the world I wanted more than this.” Lord Coke, on the other hand, was only “reasonably happy” with the sale; he claimed the proceeds would not be sufficient to cover the taxes he owed.

Hammer, the president of Occidental Petroleum Corporation, renamed his prize the Hammer Codex and added it to his valuable collection of art. When Hammer died in 1990, he left the notebook and other works to the Armand Hammer Museum of Art and Cultural Center at the University of California at Los Angeles (UCLA). Several years later, the museum offered the manuscript for sale, claiming it was forced to take this action to cover legal costs incurred when the niece and sole heir of Hammer’s late wife, Frances, sued the estate claiming Hammer had cheated Frances out of her rightful share of his fortune. On November 11, 1994, the Hammer Codex was sold to an anonymous bidder–soon identified as Bill Gates, the billionaire founder of Microsoft–at a New York auction for a new record high price of $30.8 million. Gates restored the title of Leicester Codex and has since loaned the manuscript to a number of museums for public display.

Aircraft squadron lost in the Bermuda Triangle  

By History.com

At 2:10 p.m., five U.S. Navy Avenger torpedo-bombers comprising Flight 19 take off from the Ft. Lauderdale Naval Air Station in Florida on a routine three-hour training mission. Flight 19 was scheduled to take them due east for 120 miles, north for 73 miles, and then back over a final 120-mile leg that would return them to the naval base. They never returned.

Two hours after the flight began, the leader of the squadron, who had been flying in the area for more than six months, reported that his compass and back-up compass had failed and that his position was unknown. The other planes experienced similar instrument malfunctions. Radio facilities on land were contacted to find the location of the lost squadron, but none were successful. After two more hours of confused messages from the fliers, a distorted radio transmission from the squadron leader was heard at 6:20 p.m., apparently calling for his men to prepare to ditch their aircraft simultaneously because of lack of fuel.

By this time, several land radar stations finally determined that Flight 19 was somewhere north of the Bahamas and east of the Florida coast, and at 7:27 p.m. a search and rescue Mariner aircraft took off with a 13-man crew. Three minutes later, the Mariner aircraft radioed to its home base that its mission was underway. The Mariner was never heard from again. Later, there was a report from a tanker cruising off the coast of Florida of a visible explosion seen at 7:50 p.m.

The disappearance of the 14 men of Flight 19 and the 13 men of the Mariner led to one of the largest air and seas searches to that date, and hundreds of ships and aircraft combed thousands of square miles of the Atlantic Ocean, the Gulf of Mexico, and remote locations within the interior of Florida. No trace of the bodies or aircraft was ever found.

Although naval officials maintained that the remains of the six aircraft and 27 men were not found because stormy weather destroyed the evidence, the story of the “Lost Squadron” helped cement the legend of the Bermuda Triangle, an area of the Atlantic Ocean where ships and aircraft are said to disappear without a trace. The Bermuda Triangle is said to stretch from the southern U.S. coast across to Bermuda and down to the Atlantic coast of Cuba and Santo Domingo.