ings ▁in ▁Wind ham ▁County , ▁Verm ont ▁ ▁References ▁ ▁External ▁links ▁ ▁Category : Com mer cial ▁buildings ▁on ▁the ▁National ▁Register ▁of ▁Historic ▁Places ▁in ▁Verm ont ▁Category : F eder al ▁architecture ▁in ▁Verm ont ▁Category : H ouses ▁completed ▁in ▁ 1 8 1 9 ▁Category : Build ings ▁and ▁structures ▁in ▁Gu il ford , ▁Verm ont ▁Category : National ▁Register ▁of ▁Historic ▁Places ▁in ▁Wind ham ▁County , ▁Verm ont <0x0A> </s> ▁Press ure ▁wave ▁may ▁refer ▁to : ▁▁ ▁P - wave , ▁one ▁of ▁the ▁two ▁main ▁types ▁of ▁el astic ▁body ▁waves , ▁called ▁se ism ic ▁waves ▁in ▁se ism ology ▁ ▁Mechan ical ▁longitud inal ▁waves , ▁also ▁called ▁compression al ▁or ▁compression ▁waves ▁__ DIS AM B IG __ <0x0A> </s> ▁Gr ound - level ▁power ▁supply , ▁also ▁known ▁as ▁surface ▁current ▁collection ▁and ▁Al iment ation ▁Par ▁le ▁Sol ▁( AP S , ▁which ▁literally ▁means ▁feed ing ▁via ▁the ▁ground ), ▁is ▁a ▁modern ▁method ▁of ▁third - ra il ▁elect rical ▁pick - up ▁for ▁street ▁tr ams ▁instead ▁of ▁more ▁common ▁overhead ▁lines , ▁thus ▁it ▁is ▁one ▁of ▁the ▁methods ▁that ▁could ▁allow ▁construction ▁of ▁c aten ary - free ▁light ▁rail ▁system . ▁It ▁was ▁invent ed ▁for ▁the ▁Bor de aux ▁tram way ▁( Tr am way ▁de ▁Bor de aux ), ▁which ▁was ▁constructed ▁from ▁ 2 0 0 0 ▁and ▁opened ▁in ▁ 2 0 0 3 . ▁From ▁