Tampilkan postingan dengan label ark. Tampilkan semua postingan
Tampilkan postingan dengan label ark. Tampilkan semua postingan

Rabu, 23 Maret 2016

I DON’T RECALL having heard anything said about plants on Noah’s Ark. Animals, yes, two of every kind, but no flowers or trees or vegetables. Noah certainly had sufficient meat on board for a circumnavigation but he would have found it hard going without barley for his beer and rice for his breakfast crispies.

I like to think of him as one of the first yachtsmen in the business, but perhaps he was more like Thor Heyerdahl than Joshua Slocum, because, contrary to what most of us were taught in Sunday school, Noah didn’t build his ark of wood. At least, not according to The Oxford Companion to Ships and the Seahe didn’t.

The OxCom says that the ark, in which Noah and his family escaped the deluge with all the animals, was probably not built of wood because there simply wasn’t enough wood in the entire Tigris-Euphrates region to build it of timber.

You will recall, of course, that the ark measured 300 cubits in length by 50 in beam and 30 in height. In terms of Egyptian royal cubits of about 21 inches each, that translates to a vessel measuring 521 feet long by 87 feet wide by 52 feet high. More of a ship than a boat, actually.

This has led researchers to assume that the ark was therefore built, according to the local traditional fashion, of papyrus reeds, roughly in the shape of a tea tray, with a little local wood used in the domestic quarters, cowsheds, pigsties, and so on. It sounds an awful lot like a larger version of Heyerdahl’s Kon Tiki raft.

Of course, one has to ponder how a 500-foot-long vessel constructed of reeds would hold together in any kind of seaway, but it is not for us to wonder why. Noah had faith, which is apparently as useful as a good solid wooden keel, and is not to be questioned.

Today’s Thought
God’s revelation to Adam didn’t instruct Noah how to build the ark.
— Ezra Taft Benson

Tailpiece
A little girl had just finished her first week of school.
Im just wasting my time, she said to her mother. I cant read, I cant write, and they wont let me talk!
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Minggu, 13 Maret 2016

 AS A NAVIGATOR in the dark days before GPS, I used to do a lot of guessing. Most of it was informed guessing, however. I had my reasons.

For example, I discovered that a right-handed helmsman sailed a course farther off the wind while on the beat on the port tack than did a left-handed helmsman. The opposite applied when the boat was on the other tack. The left-handed helm was using his right hand on the tiller, his weaker arm, and so the boat rounded up more in the gusts and carved a course closer to the wind. The right-handed helm was able to use his greater strength to apply more weather helm to stay on course.   

The reason I knew this was because, in between sextant sights, it was the navigator’s task to keep a dead reckoning plot. But he couldn’t stay awake in the cockpit day and night to check that the helmsman was following exactly the course he had been given, so he asked the cockpit crew at the end of every four-hour watch to estimate what their average speed had been and what average course they had sailed. This information was then plotted on the chart to give a dead-reckoning position.

In the ancient days of commercial sail they used a traverse board for the same purpose. It was a very clever little device that allowed the navigator to see at a glance the speed and course the ship had covered during the last watch. It was nothing more than a wooden board with a compass rose on its face and 32 radial rows of holes. Every half-hour, when the sand-glass was turned, the helmsman placed a peg in the hole of the compass point that matched the average direction the ship had been steered during the last 30 minutes.

At the same time, the crew ascertained the ship’s speed on a chip log, and a peg was placed in the appropriate hole on a special speed grid. So the navigator could now come on deck and see what had been happening in the way of speed and direction while he was down below, allowing for all the zigs and zags and wavy wake lines.

He would make a note of these averages and start guessing about leeway and current and a few other things that his instinct supplied corrections for, and then he could plot a dead-reckoning position on a chart. Then all the pegs were pulled out of the board for the next watch to play with.

Nowadays, with all those clever satellites twinkling away in the sky, there’s no need for a traverse board or dead reckoning. GPS does all the grunt work and makes navigation so easy that nobody has any respect for the job any more. Ordinary foredeck hands used to step back in awe when the navigator came strolling along jauntily with his sextant box under his arm and a roll of charts in his hand. Skippers used to address navigators with civility, offer them drinks, and treat them almost as if they were human. No longer, I’m afraid. All that has gone. GPS is very clever, but it has a lot to answer for.

Today’s Thought
Navigation is what tells you where you are, and, what’s just as important, where you aren’t.
 — John Vigor

Tailpiece
“Why do all those cows in Switzerland wear bells around their necks?”
“Dunno. Maybe it’s because their horns don’t work.”
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