Eucalyptos e Acacias

Vinte annos de experiencias

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Published: 1920
Language: Portugues
Wordcount: 22,248 / 85 pg
LoC Category: PQ
Downloads: 859
Added to site: 2009.01.07
mnybks.net#: 23038
Genre: Nature
Excerpt

915, mostram que a lenha de Eucalypto dá 4:353 calorias onde a lenha do pinheiro não passa de 3:200--isto é, a lenha do Eucalypto tem um terço a mais do poder calorifero da lenha de pinheiro; e póde mesmo substituir o carvão, valendo um kilo de lenha de Eucalypto por 550 grammas de hulha. De modo que, para este effeito, quando, por exemplo, uma tonelada de pinheiro custar 12 escudos, a de Eucalypto deve valer 16. E, se considerarmos que a mesma superficie plantada de Eucalyptos ou semeiada de pinheiros dá no primeiro caso um volume de madeira que é tres ou quatro vezes, pelo menos, aquelle que póde produzir na segunda hypothese, por ahi se calculará quanto vale a substituição do pinheiro pelo Eucalypto, ainda que não seja senão para criar lenha.

Secarão os Eucalyptos as fontes, segundo muitos crêem? Desconfio. Ganharam essa fama e

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