Hourglass

Hourglass - nokugadzirwa zvakachinja maonero munhu panguva. History haapi mhinduro yakajeka pamusoro dzakavapo Zvisinei, zvinganzi vakafunga kuti zano rakadaro rave richizivikanwa kare Asia BC.

Zviri nyore asi zvikuru Mobile nzira kuyera nguva - Ivo nokukurumidza kunyenga muMiddle Ages uye kuva Kuwedzera kukuru yakakurumbira panguva iyoyo chaishandiswa.

Hourglass akabvumira kuyera nguva panguva mambakwedza uye vaiva clepsydra zvikuru yakarurama. A nzvimbo inokosha inogarwa vakarinda ngarava kubva akaukanda asina dzakakurudzira zvakadaro hombe kwakabatsira dira jecha, kusiyana mvura wachi. Zvikurukuru kuburikidza navo chikepe nokukurumidza kutsunga - akanga dumped mumvura tambo pamwe nokusunungura mapfundo uye ari 30-kechipiri wachi akanga kuyerwa. Panguva iyoyowo inverting wachi vafambisi akatura mukaro mumvura anotanga kuverenga, kazhinji kuti kubata, "nodes" - nokudaro kwakange kumhanya ari nokusunungura mapfundo. Uyewo, zvikepe vakashandisa mana awa hourglass, kuvashandisa vanyatsoona nguva derzhurstva arinde chikwata chimwe.

The chikuru drawback pamusoro hourglass kwakadaro miduku zvaivapo kuyera nguva penguva. Saka, zvakanga kupfuura mukurumbira yokurinda, uyere kweawa kana maviri, dzimwe nguva kwemaawa matatu. On the Kugadzirwa uyewo rinowanzoshandiswa wachi iri metered masere kana gumi maawa - nguva rwekuita zuva.

Kururama wachi kwakadaro kunobva zvikurukuru pamusoro unhu mujecha. Yemanyorero vakashandisa jecha chete yaiva kugadzirwa regirazi - annealed, nomucheka uye sifted kuburikidza nesefa yakanaka. Pane jecha aigona kushandiswa dzakarukwa zvakanaka grated goko anoshongwa kana machena haruna kukoromoka. Uyewo hourglass zvakarurama kunobva panyika unhu regirazi kushandiswa Zvisinei nokufamba kwenguva, nokuda abrasion jecha girazi yomukati penyika, kururama wachi yakadaro anowa.

In rechi18 - rechi19 emakore, pamwe kwaita mafekitari mafekitari, zvichiguma isingadhuri kugadzirwa, kushandiswa nevakawanda, kamwe zvinodhura uye kura zvemaziso dzokurinda uye aramu nenguva yeko. Somugumisiro - the hourglass vakanga vadzingwa kushandiswa ose, asi pasinei kunyange nhasi kuti vari zvinowanzoshandiswa indasitiri, mushonga uye nedzimwe nzvimbo dzakawanda.