Musical instruments that start with the letter I include the igil, ipu, Irish uillean, Irish bouzouki, ichigenkin, inci, iya, itotele and istarski mih. The instruments originate from countries ranging from Cuba and Ireland to Croatia, Japan and the Philippines.
Bessel's functions are often used in acoustics for describing circular membranes behaviour (exploited by most of the musical instruments). They are the solutions of the wave equations using polar coordinates. Set the properties of the membrane Bessel's functions describe the vibrational modes of the membrane.
Actor Ted Bessell, best known for playing Marlo Thomas' boyfriend on the trendsetting That Girl sitcom in the 1960s, died of a heart aneurysm Sunday in Los Angeles. He was 61. Thomas yesterday said she was preparing a memorial for her former co-star. I lost a wonderful friend too soon, she said.