Instrument for Measuring Sea Depths
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Current revision as of 10:55, 27 July 2010
Has no specific name.
Contents |
Inventor
Leon Battista Alberti
Historic Period
ca. 1450
Description
Instrument described by Leon Battista Alberti in the Ludi matematici [Mathematical games] for determining the depth of the sea. An iron bar bent in the shape of a "7" is hooked to a floater and dropped to the floor of the sea. When it reaches the bottom, the iron bar settles and frees the floater, which returns to the surface. The time elapsing between the floater's disappearance into the water and its reappearance on the surface is measured with a sort of hour-glass consisting of a vessel from which water falls, drop by drop, into a recipient below it. From the amount of water, equivalent to a determined length, the depth of the sea can be computed.
Bibliographical Resources
Alberti, Leon Battista, Ex Ludi rerum mathematicarum, in L.B. Alberti, Opere volgari, a cura di Cecil Grayson, Laterza, Bari, 1973, III, pp. ??
Images
 Silvio Belli, Libro del misurar con la vista, Venezia 1570, p. 127. |
Author of the entry: Filippo Camerota
