Deflection Yoke - pictured below, wraps around the neck on the CRT and extends partway up along the sloped sides. The yoke has signals running through it's wires that create a strong electrical/magnetic field - rapidly deflecting the electron beam, scanning across the screen to paint full frames at a rate of 60 frames per second. The entire concept is truly amazing.
There are actually 4 sets of coils - two sets at the top and bottom to control vertical movement - and two sets on either side to control horizontal movement. Since they are used in combination, the beam can be made to move so that it hits the faceplate anywhere on the screen - all it takes is a a combination of vertical and horizontal magnetic field. The coils are comprised of hundreds of copper coils. A large number of coils are required, since it takes a strong magnetic field to penetrate the thick glass walls of the picture tube and move the beam left and right. The beam scans a picture across the screen, using the same pattern as reading a book does.
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