Tangira

Mu myaka ya 1830 nyuma gato y’ivuka ry’imodoka itwara umwuka, hari abantu batekereje guha imodoka ibiti n’imigozi “inzira” z’amapine, kugira ngo imodoka zitwara umwuka zigende ku butaka bworoshye, ariko imikorere ya mbere y’inzira n’ingaruka zayo si byiza, kugeza mu 1901 ubwo Lombard muri Leta Zunze Ubumwe za Amerika yavumburaga imodoka itwara imizigo mu mashyamba, yavumbuye inzira ya mbere ifite ingaruka nziza. Nyuma y’imyaka itatu, injeniyeri wa Kaliforuniya Holt yakoresheje ubuvumbuzi bwa Lombard mu gushushanya no kubaka traktori y’umwuka ya “77″”.

Ni yo trakitori ya mbere ku isi yakurikiranwe. Ku ya 24 Ugushyingo 1904, trakitori yakorewe ibizamini byayo bya mbere hanyuma ishyirwa mu bikorwa byinshi. Mu 1906, ikigo cya Holt gikora trakitori cyubatse trakitori ya mbere ku isi ikoresha moteri itwika lisansi, yatangiye gukorwa mu mwaka wakurikiyeho, ni yo trakitori yatsinze cyane icyo gihe, kandi yabaye icyitegererezo cy’itaki ya mbere ku isi yakozwe n’Abongereza nyuma y’imyaka mike. Mu 1915, Abongereza bakoze trakitori ya “Little Wanderer” bakurikiye inzira ya trakitori y’Abanyamerika “Brock”. Mu 1916, taki za “Schnad” na “Saint-Chamonix” zakozwe n’Abafaransa zakurikiye inzira ya trakitori z’Abanyamerika “Holt”. Taki zamaze imyaka hafi 90 zinjiye mu mateka ya taki, kandi inzira z’iki gihe, hatitawe ku miterere yazo cyangwa ibikoresho byazo, uburyo zitunganywamo, nibindi, zihora zikungahaza inzu y’ubutunzi bwa taki, kandi inzira zahindutse taki zishobora kwihanganira igeragezwa ry’intambara.

Ishinga Amategeko

Inzira ni impeta zoroshye zitwarwa n'amapine akora akikije amapine akora, amapine yo gutwara imizigo, amapine yo kwinjiza n'udupira two gutwara. Inzira zigizwe n'inkweto zo gutwara imizigo n'udupira two gutwara imizigo. Udupira two gutwara imizigo duhuza inzira kugira ngo dukore umurongo w'inzira. Impera ebyiri z'inkweto zo gutwara imizigo zifite imyobo, zifatanye n'uruziga rukora, kandi hagati hari amenyo atera imbaraga, akoreshwa mu kugorora inzira no gukumira inzira kugwa iyo ikigega gihinduriwe cyangwa kizungurutswe, kandi hari urubavu rudacika (rwitwa icyitegererezo) ku ruhande rw'aho ubutaka buhurira kugira ngo hongere imbaraga z'inkweto zo gutwara imizigo no gufatana kw'inzira ku butaka.