The device for measuring the current or emf is connected within the circuit of the thermocouple. It measures the amount of emf flowing through the circuit due to the two junctions of the two dissimilar metals maintained at different temperatures. In figure 2 the two junctions of the thermocouple and the device used for measurement of emf (potentiometer) are shown.
I think that this is what advertisers are shooting for when they pay the big price to get their ads up there. Regular billboards are just as effective as ever, even though there are now digital billboards being made that can have multiple ads on them and switch between them every few seconds.
A peppy jingle or clever catch phrase can make or break an ad campaign. Occasionally, an agency will create a slogan or tune that resonates so strongly with the public that it remains in play for years or even decades. These TV commercials are prime examples of that. MEMORABLE JINGLES: Winston.