In the previous section we saw limits that were infinity and itâs now time to take a look at limits at infinity. By limits at infinity we mean one of the following two limits. In other words, we are going to be looking at what happens to a function if we let x get very large in either the positive or negative sense.
Testing the Device. Bellâs assistant, Thomas Watson, was in a nearby room in Bellâs workshop, waiting to see if Bellâs device would work. Bell spoke these famous words into his device: âMr. Watson, come here. Watson heard the words clearly and distinctly, and thus, the first working model of a telephone was born. Although there were other inventors working on similar designs, including one whose patent application was almost on the same day as Bell submitted his, Bellâs invention was the first actual working telephonic device.
The telephone was the first device in history that enabled people to talk directly with each other across large distances.he hookswitch signals to the central office that the user has picked up the handset to either answer a call or initiate a call. A dial, if present, is used by the subscriber to transmit a telephone number to the central office when initiating a call.