La Girona VIII

Whistle, Astrolab and more

Let’s finish our exploration of the “Treasures from the Girona” permanent exhibit, Ulster Museum, Belfast, Northern Ireland.

One hundred and eighty five (185) years after La Girona ran aground and broke up on the, later named, Spanish Rocks, the first reliable navigational chronometer was tested (1773). The navigators of the Spanish Armada remnants were sore pressed to follow the orders of their commander (see below) because (1) Spanish charts were incomplete and inaccurate (2) without accurate time keeping they were only able to reliably measure the location north/south (latitude), not east/west (longitude). Without this, navigators used Dead Reckoning, they measured current position from the last position, heading (direction of motion), and speed.

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The astrolab (below), used to measure the angle between a heavenly body (sun/moon/star) and the horizon at a given time of day, obtained the latitude. The dividers used on the (unreliable) charts. A weight on a measured cord determined the depth of the bottom. Not recovered was the instrument for estimating speed. It is a length of rope knotted at set intervals and attached to a “chip log” resistant to passage through water. Thrown into the water a sailor counted how many knots passed by in a given time, thus the designation, still used today, of speed in “knots”.

Sound (a whistle) was the method used for command and control by both Spanish and British.

Interesting odds and ends.

Evidence of trade between England and Spain.

Thank You for visiting (Click for the first post of this series)

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Copyright 2020 All Rights Reserved Michael Stephen Wills

4 thoughts on “La Girona VIII

    1. According to Wikipedia, “La Girona (/lɑː xɪˈrɔːnɑː/) was named after the Girones family, who at the time had just become Dukes of Osuna and viceroys of Naples]; thus it is not to be confused with Girona, the Catalan name of the city and province of Gerona in Spain.” Historical references are cited.

      Liked by 1 person

      1. Maybe. The word is a place, ship or family name in all the instances I can find. Historically the heir to the Spanish Throne was the Prince/Princess of Girona, so potentially such a family name was a feudal link to the throne. Found nothing to prove this, though the ship name is a clue.

        Liked by 1 person

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