David also made the arc he discovered serve mankind. His attempt to transform it into an arc lamp was finally fully applied in Edison's time. In addition, David was the first person to record the catalytic ability of platinum.

From 65438 to 0820, David became the president of the Royal Society. His science lecture in London attracted thousands of male and female audiences. Front seats and main seats are always bought by wealthy elites, while ordinary listeners can only afford cheap side seats. There was a bookstore apprentice in the audience, who was later the famous electrician Faraday.

David found that Faraday only knew people, so he asked him to talk. He warned Faraday: "Science is a miserly housewife, asking people who serve him to pay great labor, but paying little. Besides, experiments often cause explosions ... "Faraday replied ... I pursue science, and scientific work itself is a reward! "

David was deeply moved and hired Faraday as his assistant. Later, Faraday made great contributions to electromagnetism and even surpassed David in scientific achievements. Therefore, people talk about David today, and always say that Faraday is the greatest discovery of all David's discoveries.