▁quality ▁cast . ▁It ▁was ▁only ▁in ▁modern ▁times ▁that ▁repeat able ▁harm onic ▁tun ing ▁using ▁a ▁known ▁scientific ▁basis ▁was ▁achieved . ▁The ▁main ▁partial s ▁( or ▁harm on ics ) ▁of ▁a ▁well - t un ed ▁bell ▁are : ▁▁ ▁hum ▁note ▁( an ▁oct ave ▁below ▁the ▁named ▁note ) ▁ ▁strike ▁tone ▁( also ▁called ▁tap ▁note ▁or ▁named ▁note ) ▁ ▁tier ce ▁( a ▁minor ▁third ▁above ▁named ▁note ) ▁ ▁qu int ▁( a ▁fifth ▁above ▁named ▁note ) ▁ ▁nom inal ▁( an ▁oct ave ▁above ▁named ▁note ) ▁ ▁Further , ▁less - aud ible , ▁ ▁harm on ics ▁include ▁the ▁major ▁third ▁and ▁a ▁perfect ▁fifth ▁in ▁the ▁second ▁oct ave ▁above ▁the ▁named ▁note . ▁ ▁This ▁quest ▁by ▁various ▁found ers ▁over ▁centuries ▁of ▁bell ▁found ing ▁has ▁resulted ▁in ▁development ▁of ▁an ▁optim um ▁profile ▁for ▁casting ▁each ▁size ▁of ▁bell ▁to ▁give ▁true ▁harm onic ▁tun ing . ▁Although ▁b ells ▁are ▁cast ▁to ▁accurate ▁patterns , ▁variations ▁in ▁casting ▁mean ▁that ▁a ▁final ▁tun ing ▁is ▁necessary ▁as ▁the ▁shape ▁of ▁the ▁bell ▁is ▁critical ▁in ▁producing ▁the ▁desired ▁strike ▁note ▁and ▁associated ▁harm on ics . ▁Tun ing ▁is ▁undert aken ▁by ▁cl amp ing ▁the ▁bell ▁on ▁a ▁large ▁rot ating ▁table , ▁and ▁using ▁a ▁cutting ▁tool ▁to ▁remove ▁metal . ▁This ▁is ▁an ▁iter ative ▁process ▁in ▁which ▁metal ▁is ▁removed ▁from ▁certain ▁parts ▁of ▁the ▁bell ▁to ▁change ▁certain