A safety coffin is a coffin fitted with a mechanism to prevent premature burial or allow the occupant to signal that he has been buried alive. A large number of designs for safety coffins were patented during the 18th and 19th centuries and variations on the theme are still available today.
The Dymaxion car was a concept car designed by U.S. inventor and architect Buckminster Fuller in 1933.
To commemorate the 80th anniversary of the first television, the Cook Islands issued this 39mm copper-nickel 1 Dollar coin in 2006. Pictured on the coin is a black and white picture of John L. Baird, the first successful inventor of electronic television, and a moving recreation of his first broadcast; a hand moving in front of a puppet.
An astrolabe is an historical astronomical instrument used by classical astronomers, navigators, and astrologers.
The Black Star of Queensland, is a black sapphire, and was the world's largest gem quality star sapphire until The Star of Adam was discovered. The stone was reportedly discovered by 12-year-old Roy Spencer in the mid-1930s in the Queensland gem fields. Roy showed the stone to his father who assumed that it was merely a large black crystal. Not realizing the value of the stone with its rough exterior, the family used it as a doorstop in their home for over a decade, until they took a closer look and discovered the gem hidden within.
The Portuguese Diamond is an unusual Octagonal Emerald cut known for its flawlessness and clarity. It weighs 127.01 carats and is regarded as one of the world’s most magnificent diamond gems.