If your digital TV is getting a signal at all, you're getting clear audio and video. Â­That said, if you have a TV with an analog tuner and a terrestrial antenna -- not a satellite dish antenna -- you need a digital-to-analog converter box to continue watching TV now that the deadline for conversion has passed.igital TV Conversion. You might think that with the switch to digital television you need to buy a new, expensive high-definition television (HDTV) set. You can do that if you want to, and you'd have many good reasons to do so.
Lavoisier immediately repeated Priestleyâs experiments and, between 1775 and 1780, conducted intensive investigations from which he derived the elementary nature of oxygen, recognized it as the âactiveâ principle in the atmosphere, interpreted its role in combustion and respiration, and gave it its name.
He had produced oxygen gas by heating mercuric oxide and various nitrates in 1771â2. Scheele called the gas fire air because it was the only known supporter of combustion, and wrote an account of this discovery in a manuscript he titled Treatise on Air and Fire, which he sent to his publisher in 1775.