What were the two electronic devices that farnsworth combined to invent the electronic television?

In 1930, the same year that Farnsworth was granted a patent for his all-electronic TV, his labs were visited by Vladimir Zworykin of RCA, who had invented a television that used a cathode ray tube (1928) and an all-electric camera tube (1929).

It seems to me that the President was giving a speech about resigning or leaving office. Although it is hard to know for sure giving the following answer options. The president talks about sealing a book and normally this metaphor is used when referring to one's self. Secondly, he speaks about public opinion polls. The most important public opinion polls that we have in the United States are for the presidential election when choosing between to presidential candidates. Or in this situation reelection. So to me it seems to me that this speech is a resignation speech.