generate questions: In 1937, at a luncheon in his honor concerning the death ray, Tesla stated, "But it is not an experiment ... I have built, demonstrated and used it. Only a little time will pass before I can give it to the world." His records indicate that the device is based on a narrow stream of small tungsten pellets that are accelerated via high voltage (by means akin to his magnifying transformer).
When did Tesla claim to have built the weapon? {sep_token} What was the occasion when he claimed he'd made the death ray? {sep_token} Of what material were the death rays pellets made? {sep_token} What was used to accelerate the tungsten pellets? {sep_token} How much time did he claim had to pass before he gave the ray to the world? {sep_token}