laujik gate ke haaidrolik, vaayaveeya aur yaantrik sanskaran maujood hain aur aisi sthitiyon mein istemaal kiye jaate hain jahaan bijli ka upayog naheen kiya ja sakta. pehle do prakaar ko fludeeks ke tahat maana jaata hai. fludeek laujik ka ek prayog, sainya haardaveyar mein hai jiske ek vidyut chumbakeeya pals mein ujaagar hone ki sambhaavana hai (parmaanu EMP, ya NEMP) jo bijli ke sarkit ko nasht karta hai.
1612 mein jemsataaun ke avasthaapan ke chhah saal baad John raalf pehle adhivaasi hain jinhonne tambaakoo ki ek nakadi fasal ke roop mein safalataapoorvak kheti ki. tambaakoo ki maang mein teji se vruddhi hui, use "bhoora sona" kaha gaya, kyonki usane sone ke abhiyaan mein vifal varjeeniya ko share company mein punarjeevit kar diya.[21] puraani duniya ki maangon ko poora karne ke liye tambaakoo ki paidaavaar lagaataar ki gayi jiske parinaamasvaroop jameen ki urvara shakti sheegra hi kam ho gayi. isne pashchim ko ek agyaat mahaadveep mein basane ke liye prerak ka kaarya kiya aur isi tarah tambaakoo utpaadan ka ek vistaar hua.[22] bekan vidroh ke pehle tak anubandhit daasata hi praathamik shram bal ka aadhaar thi jiske kaaran das pratha par dhyaan kendrit hua.[23] yeh pravrutti ameriki kraanti ke baad kam hui aur daasapratha laabhaheen maani gayi. haalaanki yeh pratha 1794 mein punarjeevit ho gayi jab kapaas ki charkhi ka aavishkaar hua.[24][page needed]
pipe dhoomrapaan mein aamtaur par tambaakoo ke dahan ke liye ek chhota sa kaksh (katora) aur ek patali nalika (danda) shaamil hai, jo mukhapatr (thoda) mein samaapt hota hai. tambaakoo ke kase tukadon ko kaksh mein rakha aur prajvalit kar diya jaata hai. pipe mein dhoomrapaan ke liye tambaakoo aksar bahut dhyaan dekar istemaal kiya jaata hai aur svaad ki baareekiyon ki mishrit upalabdhata anya tambaakoo utpaadon mein upalabdh naheen hai.
ek laujik gate ki "vishvasaneeyata", asafalata (MTBF) ke beech uske ausat samay ka varnan karti hai. digital masheenon mein aksar laakhon laujik gate hote hai. iske alaava, adhikaansh digital masheenon ko unki laagat ko kam karne ke liye "anukoolit" kiya jaata hai. nateeja saaf hota hai, ek ekal laujik gate ki vifalta, ek digital machine ke kaam band karne ka kaaran banegi.
sanvedya jagat enalaug ke hain aur is jagat se sanket enalaug maatraaen hain. udaaharan ke liye prakaash, taapamaan, dhvani, vidyut chaalakata, vidyut aur chunbakeeya aadhaar enaalaug hain. sabse upayogi digital system nirantar enaalaug sanketon se digital sanketon ko alag karne ke liye badalna hoga. yeh parimaaneekaran trutiyon ka kaaran banta hai.
prativedan ke liye engineer digital system ke prakaaron par vichaar karte hain. adhikaansh digital system "sanyojan system" aur "anukramik system" mein vibhaajit ho jaate hain. sanyojan pranaali mein hamesha jo input diya jaata hai vahi aautaput vah deta hai. yeh mool roop se laujik prakriya ke set ka pratinidhitv karta hai aur jiski charcha pehle hi ki ja chuki hai.

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