usement ▁of ▁the ▁children . ▁ ▁See ▁also ▁ ▁Ac oust ic ▁transmission ▁line ▁ ▁Head ph ones ▁ ▁History ▁of ▁the ▁tele phone ▁ ▁Inter com ▁ ▁Pi pe ▁( fl uid ▁convey ance ) ▁ ▁P neum atic ▁t ube ▁ ▁St eth os cope ▁ ▁T in ▁can ▁tele phone ▁ ▁References ▁ ▁External ▁links ▁ ▁M iche le ▁Ger va is , ▁" Em press ▁of ▁Ireland ▁- ▁Vo ice ▁T ub es ", ▁Canadian ▁Museum ▁of ▁Im m igration ▁at ▁Pier ▁ 2 1 ▁Mar itime ▁voice ▁pip es ▁and ▁terrest rial ▁speaking ▁tub es , ▁The ▁Am pl ifier ▁Institute ▁Vo ice pipe ▁usage ▁proposed ▁for ▁a ▁locomot ive ▁( ne ver ▁built ), ▁The ▁Am pl ifier ▁Institute ▁ ▁Category : History ▁of ▁tele communic ations ▁Category : T ele phony <0x0A> </s> ▁The ▁Ev il ▁Div ide ▁is ▁the ▁e ighth ▁studio ▁album ▁by ▁the ▁American ▁thr ash ▁metal ▁band ▁Death ▁Angel , ▁released ▁on ▁May ▁ 2 7 , ▁ 2 0 1 6 . ▁This ▁album ▁marked ▁the ▁first ▁time ▁since ▁Act ▁III ▁( 1 9 9 0 ) ▁that ▁Death ▁Angel ▁had ▁not ▁made ▁any ▁personnel ▁changes ▁in ▁three ▁consecutive ▁studio ▁albums , ▁and ▁their ▁third ▁collaboration ▁with ▁long time ▁producer ▁Jason ▁Sue c of . ▁ ▁Re ception ▁ ▁The ▁Ev il ▁Div ide ▁has ▁received ▁positive ▁reviews . ▁Kevin ▁Stewart - P ank o ▁of ▁Metal ▁In jection ▁gave ▁the ▁album ▁a ▁rating ▁of ▁seven - and - a -