Short-term disability insurance, which is most often purchased as part of a group at work, can be paid by either the employer or the employee. Group short-term disability insurance policies are guaranteed issue, meaning you do not have to take a medical exam to buy coverage.
In 1650, Otto von Guericke invented the air pump, used to create a partial vacuum. Using hollow copper spheres and an air pump of his own construction, Guericke demonstrated that a partial vacuum could be created by pumping the air out of the sphere.
Guericke was able to prove that the sparks generated were electrical in nature. The first practical use of static electricity was the âelectric pistol,â which was invented by Alessandro Volta (1745-1827). An electrical wire was placed in a jar filled with methane gas.he discovery was known as the Baghdad or Parthian battery (see Figure 1) and was believed to be 2000 years old, dating back to the Parthian period [The Parthian empire existed in what is now Iran from 247 BC-224 AD. â Ed .]. The battery consisted of a clay jar filled with vinegar.