Corrected entry: The first appearance of the Martian machinery is the 'Cobra head/Skeleton Ray' that appears from out of the cylinder after the top unscrews and falls to the ground. The size of the hole that the 'Cobra' is protruding through is far too small for the remainder of the Martian war machine to have been able to exit from.
Corrected entry: During the first big battle between the Martians & the U.S. Army, the Martians use their heat ray to vaporise people and equipment. Dr. Forrester, a physicist, then quickly speculates, "It neutralises mesons somehow. They're the atomic glue holding matter together. Cut across their magnetic lines of force and any object will simply cease to exist." During the '50s mesons were theorised to hold atomic nuclei together strongly. But if the Martian rays worked as the Dr. guessed, then objects wouldn't just vaporise. They'd explode with the ferocity of nuclear weapons.