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Scope: 農政全書
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卷十九

3
《龍尾車記》曰:龍尾車者,河濱挈水之器也。治田之法,旱則挈江河之水入焉,潦則挈田間之水出焉。治水之法,淺涸則挈水而入方舟焉,疏濬則挈水而出畚鍤焉。不有水之器,不得水之用。三代而上,僅有桔槔。東漢以來,盛資龍骨。龍骨之製,日灌水田二十畝,以四三人之力。旱歲倍焉,高地倍焉。駕馬牛,則功倍,費亦倍焉。溪澗長流而用水,大澤平曠而用風,此不勞人力自轉矣。枝節一,全車悉敗焉。然而南土水田,支分櫛比,國計民生,於焉是賴,即茲器所在,不為無功已。獨其人終歲勤動,尚憂衣食。至北土旱災,赤地千里,欲拯斯患,宜有進焉。今作龍尾車,物省而不煩,用力少而得水多。其大者一器所出,若決渠焉。累接而上,可使在山,是不憂高田。築為堤塍而出之,計日可盡,是不憂潦歲與下田。去大川數裏數十里,鑿渠引之,無論水稻若諸水生之種,可以必濟,即黍稷菽麥木棉蔬菜之屬,悉可灌溉,是不憂旱。濬治之功,出水當五分之一,今省十九焉,是不憂疏鑿。龍蟠之鬥,旱熯之年,上源枯竭,穿渠旁引,多用此器,下流之水,可令複上,是不憂漕也。蓋水車之屬,其費力也以重。水車之重也,以障水,以帆風,以運旋本身。龍尾者,入水不障水,出水不帆風,其本身無銖兩之重,且交纏相發,可以一力轉二輪;遞互連機,可以一力轉數輪。故用一人之力,常得數人之功。又向所言風與水,能敗龍尾之車也,在鶴膝、鬥板。龍尾者,無鶴膝,無鬥板,器居水中,環轉而已。湍水疾風,彌增其利。故用風水之力,而常得人之功。若有水之地,悉皆用之,竊計人力可以半省,天災可以半免,歲入可以倍多,財計可以倍足。方於龍骨之類,大略勝之。然而千慮之一,以當起予可也。智士用之,曲盡其變,不盡方來,或者無煩覼縷焉。

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