▁group ▁of ▁tor ped o ▁boat ▁destroy ers ▁( TB D s ) ▁built ▁for ▁the ▁Royal ▁Navy ▁in ▁the ▁late ▁ 1 8 9 0 s . ▁They ▁were ▁constructed ▁to ▁the ▁individual ▁designs ▁of ▁their ▁build ers ▁to ▁meet ▁Admir alty ▁specific ations , ▁the ▁unit ing ▁feature ▁being ▁a ▁specified ▁top ▁speed ▁of ▁ ▁and ▁four ▁fun n els , ▁although ▁the ▁fun nel ▁spac ings ▁differ ed ▁between ▁ships . ▁All ▁" 3 0 ▁kn ot ter " ▁vessels ▁with ▁four ▁fun n els ▁were ▁class ified ▁by ▁the ▁Admir alty ▁as ▁the ▁B ▁class ▁in ▁ 1 9 1 3 ▁to ▁provide ▁some ▁system ▁to ▁the ▁naming ▁of ▁H M ▁destroy ers . ▁ ▁Four teen ▁vessels ▁were ▁built ▁by ▁La ird ▁Brothers ▁at ▁Bir ken head ▁( in ▁ 1 9 0 3 ▁to ▁become ▁part ▁of ▁C amm ell ▁La ird , ▁Bir ken head ), ▁seven ▁by ▁Pal mers ▁Sh ip building ▁and ▁Iron ▁Company ▁at ▁Heb burn - on - Ty ne , ▁and ▁one ▁each ▁by ▁Arm strong ▁Whit worth ▁at ▁Walker - on - Ty ne , ▁William ▁Do x ford ▁and ▁S ons ▁at ▁S under land , ▁and ▁J ▁& ▁G ▁Thom son ▁( l ater ▁to ▁become ▁John ▁Brown ▁and ▁Company ) ▁at ▁C ly de bank . ▁All ▁vessels ▁had ▁a ▁distinct ive ▁" t urt le back " ▁forec ast le ▁that ▁was ▁intended ▁to ▁clear ▁water ▁from ▁the ▁bow , ▁but ▁actually ▁t ended ▁to ▁dig