Tokuji Hayakawa was an early-20th-century entrepreneur whose inventions included a mechanical pencil he called the Ever-Ready Sharp Pencil, and later renamed the Ever-Sharp Pencil. Over time his company branched into other types of inventions, and...
water hammer n.— «It sounds as if the condition which you are describing is a perfect example of what is called “water hammer.” This noise generally occurs when you turn off the water at a faucet or an appliance quickly. The...
