▁Cook top ▁ ▁A ▁cook top ▁or ▁h ob ▁is ▁a ▁cook ing ▁app liance ▁that ▁he ats ▁the ▁bottom s ▁of ▁p ans ▁or ▁p ots ; ▁it ▁does ▁not ▁have ▁an ▁en closed ▁o ven ▁as ▁used ▁for ▁b aking ▁or ▁ro ast ing . ▁Cook top s ▁may ▁be ▁ ▁he ated ▁by ▁gas ▁or ▁electric ity ▁and ▁may ▁also ▁have ▁exhaust ▁systems . ▁ ▁Fl att op ▁gr ills ▁are ▁also ▁being ▁installed ▁into ▁kitchen ▁coun ters ▁and ▁islands , ▁which ▁do ▁double - d ut y ▁as ▁a ▁direct ▁cook ing ▁surface ▁as ▁well ▁as ▁a ▁platform ▁for ▁he ating ▁p ots ▁and ▁p ans . ▁A ▁hot ▁plate ▁is ▁a ▁similar ▁device , ▁which ▁is ▁mobile ▁and ▁can ▁be ▁used ▁as ▁an ▁appropriate ▁technology . ▁ ▁See ▁also ▁ ▁References ▁▁ ▁Category : Sto ves ▁Category : O vens ▁Sto ve <0x0A> </s> ▁Keith ▁T rit ton ▁is ▁an ▁astronom er ▁and ▁observ atory ▁manager ▁who ▁has ▁worked ▁in ▁various ▁different ▁parts ▁of ▁the ▁world . ▁He ▁joined ▁the ▁Royal ▁Green wich ▁Observ atory ▁( then ▁at ▁Her st mon ce ux ▁in ▁Sus sex ) ▁in ▁ 1 9 6 7 ▁as ▁a ▁research ▁astronom er ▁and ▁later ▁worked ▁at ▁the ▁Rad cl iffe ▁Observ atory ▁in ▁South ▁Africa ▁and ▁the ▁Royal ▁Observ atory ▁Edinburgh . ▁He ▁spent ▁a ▁number ▁of ▁years ▁as ▁a ▁university ▁lect urer ▁in ▁the ▁Philippines ▁and ▁in ▁Th ailand . ▁His ▁particular ▁interest ▁is ▁observ ational ▁astronom y . ▁He ▁was