The first guess is that the anti-gravity aircraft is mentioned in the note. Tesla published several research reports on anti-gravity aircraft before his death. From the report, we can see that the anti-gravity aircraft described by Tesla has no wings and does not need external propulsion. It can always be in an absolutely static state in the air, even if the wind is strong, it can still remain motionless. In the published report, Tesla only showed the design drawings, without specific design principles. At that time, many people said that he was bragging. Later, some scientists found that this situation is indeed possible. Tesla's notes probably contain the design principle of this plane. He is worried that he will be killed by criminals after death. Use it, so burn it. ?
The second guess is that there is a death ray weapon in the note, which is a powerful new weapon. In the papers published at that time, Tesla not only showed the design drawings, but also added design formulas. Tesla's original intention in designing this product was to reduce the cost of power generation so that human beings can be fully electrified, but he was worried that someone would use this weapon in the war and cause world chaos, so he chose to burn it directly.
The third is man-made earthquake. In an oscillator experiment in 1898, Tesla was warned by the police because it caused violent vibration of surrounding houses and buildings. After coming again, Tesla invented the oscillator, which can make ten floors collapse instantly, showing how big the killer is. Based on the above two considerations, Tesla chose to burn the notes.