Detailed Instructions: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Problem:Passage: An evil genius of unknown identity, calling himself "Dr. Vulcan" (heard only as a voice and seen as a mysterious shadow on a brightly lit wall), plots to conquer the world. He needs to first eliminate, one by one, the members of the Science Associates, an organization of America's greatest scientists. 
After narrowly escaping an attempt on his life by Vulcan, one member of Science Associates, Dr. Millard goes into hiding. He soon outfits another member, Jeff King with an advanced, atomic-powered rocket backpack, attached to leather jacket with a bullet-shaped, aerodynamic flight helmet, and a raygun that they had been developing together.
Using the flying jacket and helmet and other inventions provided by Dr. Millard, and aided by magazine reporter and photographer Glenda Thomas, Jeff King, as Rocket Man, battles Vulcan and his henchmen through a dozen action-packed Republic serial chapters. Eventually, Vulcan steals Millard's most dangerous invention, a Sonic Decimator, and uses it to flood, then destroy both New York City and the rest of Manhattan Island. The mysterious Dr. Vulcan is eventually unmasked and brought to justice by Jeff King while in his Rocket Man persona.
Solution:
What is the full name of the person who invented the Sonic Decimator?