Rula

Rula (kutoka Kiingereza ruler) ni kifaa kinachotumika kupima urefu wa kitu na kuchora. Kizio cha kawaida cha kupima urefu ni Mita (m). 

Hata hivyo, mita si kizio pekee cha kupima urefu, kuna vizio vingine kama vile Kilometa, sentimeta, Milimita na vilevile Maili n.k. ambavyo hutumika kupima urefu."ruler noun - Definition, pictures, pronunciation and usage notes - Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com". www.oxfordlearnersdictionaries.com. Archived from the original on 25 October 2017. Retrieved 25 April 2018.

 Aina 
Rula hutengenezwa kwa aina mbalimbali na urefu tofauti. Baadhi ni za mbao, chuma au plastiki. Rula fupi ni bora kwa kuweka mfukoni, wakati nyingine ni ndefu kwa matumizi mbalimbali. 

 Historia 
Rula zilianza kutumika miaka mingi iliyopita. Ufito wa shaba wa kupimia wa kale kabisa ni wa mwaka 2650 KK na ulivumbuliwa na Mjerumani Eckhard Unger huko Nippur.Engineering Toolbox. "Rollers and Bearings – Uses and Applications". https://www.engineeringtoolbox.comAutoevolution. "Rollers and their Applications in Automobiles". https://www.autoevolution.comMachine Design. "How Rollers Work in Manufacturing Processes". https://www.machinedesign.com

Rula zilizotengenezwa kwa pembe ya ndovu zilitumiwa kwenye Ustaarabu wa Bonde la Indus kabla ya 1500 KK. Rula ya aina hii ilipatikana wakati wa uchimbaji huko Lothal (2400 KK) ikiwa na milimita 1.6.

Anton Ullrich alivumbua rula ya kukunja mwaka 1851. Frank Hunt alivumbua rula inayopindika mwaka 1902.

Marejeo

Jamii:Vifaa