Some were condensing air into a dry tangible substance, by extracting the nitre, and letting the aqueous or fluid particles percolate; others softening marble, for pillows and pin-cushions; others petrifying the hoofs of a living horse, to preserve them from foundering.
There are no more uses of "tangible" in the book.
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They set tangible goals.
The performance goal should be expressed as a tangible, measurable objective, against which actual achievement can be compared.