The London Eye holds 32 capsules (although it is possible to board capsule number 33 as number 13 has been skipped). Visits last for one rotation, which takes about 30 minutes, and during that time visitors rise to a peak height of 443ft (135m). From there, it’s possible to see up to 25 miles (40km) away.
The pitch of each consecutive fret is defined at a half-step interval on the chromatic scale. Standard classical guitars have 19 frets and electric guitars between 21 and 24 frets, although guitars have been made with as many as 27 frets. Frets are laid out to accomplish an equal tempered division of the octave.