deaths
February 5, 1922
Slavoljub Eduard Penkala, Croatian engineer, invented the mechanical pencil (born 1871)
Slavoljub Eduard Penkala
Slavoljub Eduard Penkala was a Croatian engineer and inventor.
Mechanical pencil
A mechanical pencil or clutch pencil is a pencil with a replaceable and mechanically extendable solid pigment core called a "lead". The lead, often made of graphite, is not bonded to the outer casing, and the user can mechanically extend it as its point is worn away from use. The vast majority of mechanical pencils have erasers.