What is an Arc ? | Arc in Circuit Breaker Before going through details of arc quenching or arc extinction technologies employed in circuit breaker we should know first what is arc actually. What is an Arc ?
Meet the World's Tallest and Shortest Dogs! Gibson and Boo Boo. These are the extremes: the world's tallest dog Gibson (7 ft / 2.1 m tall when standing on his hind legs) has met Boo Boo (4 in / 10 cm high) the world's smallest dog in Sacramento, California for Guinness World Records Day 2007.
Only the cheetah tops him for speed in the animal world.. 20.3 m/s. A member of the sight hound family, the greyhound is one of the few original dog breeds and can be traced back to ancient Egypt. Tombs from the year 4,000 BC to 3500 BC, are adorned with drawings of dogs resembling the greyhound and saluki.