Rock Solid

Ahnighito_AMNH,_34_tons_meteoriteAs you may have read, Siberians are rushing out to look for bits of the meteor that exploded there a week ago Friday, in hopes of selling them for a lot of money. (I blogged about that meteor, as well as the one from 1908, here.)

The heaviest meteorite ever moved by humans is now sitting on the ground floor of the American Museum of Natural History. The 34 ton iron rock is so heavy, it has to stand on supports that reach all the way into the bedrock below the museum. It’s called the “Ahnighito”, or the “Cape York Meteorite,” and it was sold to the museum by none other than the famous Arctic explorer, Robert E. Peary.

He excavated three stones from Savissivik, Greenland, after coaxing the local Inuits to show him where to find them. (It took some doing to convince them. In his account, he calls them “Eskimos” and, elsewhere, “a little family of Arctic aborigines.” Shudder.) You can read his firsthand account of that expedition here. You can also read a previous post of mine about Peary and Henson and what the Inuits taught them about Arctic-wear here.

One of the meteorites weighed about 5,500 pounds, another about 1100 pounds. These he arranged to have excavated and moved using hydraulic jacks to dislodge them, then ferried across water on a seven foot thick ice raft.

But removing the monster, the Ahnighito, was a different story. It had collided with the Earth 10,000 years ago. For centuries, the Inuit had chipped off pieces of iron from all the meteorites for metal tools and harpoons.

Peary enlisted “all the able-bodied men of the village” to work for him excavating and transporting the monster onto his ship. I’m pretty sure he didn’t give them any money. But he did pay them with “guns, knives, ammunition, and other articles which I had brought to reward them for their faithful service.” What’s not clear in his account is how the Inuits felt about having their sources of iron removed. Peary sold the meteorites to the American Museum of Natural History for $40,000.

How did they move a 34 ton iron rock? They dislodged it with massive hydraulic jacks. Then they laboriously moved it on rails, rolled it down a hill, and built more rails to get it to water’s edge. It took a few tries–he had to abandon the rock near the water’s edge, for fear of his ship being damaged, returning the following spring.

Raising Peary Meteorite from ship's holdThey needed a big ship. To get it on board . . . well, here’s Peary’s description. You don’t have to read it too closely. If you just scan it, you’ll get the idea. (But if you want to read his account in full, you can do so here.)

The backbone of the bridge consisted of two royal sticks of fourteen inch by sixteen inch white oak, sixty feet long straight grained, tough, and well seasoned, which were to span the gap between the ship and the shore, reach well under the meteorite at one end, across the ship at the other. A third stick of lumber twelve by twelve inches and thirty inches long, reinforced these in the span from ship to the shore, and the whole was bound rigidly together by heavy timber cross heads and spreaders, bolted through an through by powerful screw bolts of the best Swedish iron. The span from the ship to the shore was reinforced and strongly trussed with the ship’s steel-wire cable and posts of twelve inch timbers. Thirty foot standard steel rails of the New York, New Haven, and Hartford R. R. weighing one hundred pounds to the yard were hoisted out and laid in pairs, side by side, on each of the oak timbers, with their inshore ends under the meteorite, and the other ends coming just in board of the Hope’s starboard rail. Two fifteen foot lengths of rail continued the track across the main hatch, and then all were fastened down with numerous spikes.
The massive timber car, clamped together like the bridge, by heavy screw bolts, and sheathed underneath with steel plates was then hoisted on the rails, and pushed out against the meteorite; some of the timbers removed; the front of the meteorite jacked up till half of the car could be forced under it; then this part lowered, the rear raised, the other timbers of the car placed in position, and the car bolted firmly together again, then the meteorite was finally lowered to its position on the car. As the jacks were lowered the weight was transferred entirely to the car, every projection underneath the meteorite buried itself in the solid timber, the joints closed up until almost invisible, every inequality in the steel sheathing beneath the car flattened out, the bases of the rails sank imperceptibly into the oak stringers, and the earth and gravel beneath these, settled and compressed into rock like solidity. The monster was lashed to the car by fathom after fathom and turn after turn of steel chains, tightened by oak wedges, until it and the car were inseparable.

He keeps going, but you get the idea. Once on board the ship, the iron rock made the ship’s compasses go haywire. But they arrived safely at New York–here are more pictures, courtesy of the digital history project website.

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By Mike Cassano (Ahnighito meteorite) via Wikimedia Commons
“Raising the meteorite from the hold,” http://www.digitalhistoryproject.com/2011/07/saviksue-lieutenant-robert-e-peary.html
“The great meteorite being swung on to the wharf,” http://www.digitalhistoryproject.com/2011/07/saviksue-lieutenant-robert-e-peary.html
“The meteorite covered and placed under guard at the wharf,” http://www.digitalhistoryproject.com/2011/07/saviksue-lieutenant-robert-e-peary.html