file:///G|/Program%20Files/eMule/Incoming/E.%20E.%20Doc%20Smith%20-%20William%20B.%20%20Ellern%20-%20New%20Lensman.txt
large, slightly battered, metal desk, and one of the tables were piled high with notebooks,
magazines, tapes and papers. Models of gadgets were scattered about the room. A drafting tank and
a bookcase were behind the desk in easy reach. The only real concession to comfort was two well-
upholstered easy chairs and a couch.
Even then, the folded blanket on the floor next to the couch suggested that it had been used for
more than just a place to sit.
'Are you familiar with the Rodebush-Bergenholm field?' Larry asked.
'No,' Dr. Kelvin answered. 'Sit down. Sit. I've seen Rodebush and Bergenholm's note in Nature but
it doesn't give any of the essential details.'
'The field is the best matter shield yet developed,' Larry explained. 'It was derived from a
similarity between the equations for the spaceship wall shield and those for artificial gravity.
However, instead of dissipating the energy impinging on the field, it's stored in the field, or
more accurately, circulated through the matter encompassed by the field. The generator can
actually use part of the energy stored inside the field to strengthen and maintain itself.
However, the field does require a conductor through it. The Hill, where the prototype is being
installed, uses the alloy sheathing covering it as the conductor for the field. It's not as
effective as it could be, so they're cleaning down the surface and copper plating. But until they
finish, the alloy is there, and usable: As part of our program of up-grading Solarian Patrol bases
and major spaceports, we propose to metal coat the surface over Copernicus and use a Rodebush-
Bergenholm field as protection against bombardment.'
'But that would be a major engineering project!' Dr. Kelvin said. 'The Hill was sheathed during
the Jovian Wars using a wartime budget. Sheathing just the crater wall side of Copernicus alone
would be an incredibly difficult task, and financing it during peacetime ...' Dr. Kelvin shook his
head.
'No, a sheath isn't necessary,' Larry said. 'An evaporative coating of copper a few micro-inches
thick would be quite adequate. To the Rodebush-Bergenholm field it would be the equivalent of a
sheath of several feet of alloy. With the field on, it would give a protection no thickness of
alloy alone could give. The field is completely opaque to almost all radiation, so your blaster
batteries and communication antennas will have to be moved. Mayor Love is clearing that with the
appropriate Directors and Copernicus Control.
'I see why it would be useless on spacecraft,' Dr. Kelvin said. 'They would be completely blind.'
He pondered for a moment in thought and then turned to his desk. He called up from the micro-file
inside the desk a series of maps of the crater, a couple of references and the Rodebush-Bergenholm
letter. After consulting these, he connected in the computer and sketched the problem in the
drafting tank. A minute later he looked up at Lt. McQueen.
'To cover an area 50 miles long, 10 miles outward from the crater rim over us and 15 miles from
the rim down to the floor with a thickness of 400 micro-inches of copper will require a minimum of
one million cubic feet of material!' he said.
'That's an order of magnitude thicker than is required by my estimate,' Larry said coolly. 'That
reduces your quarter million tons to around 25 thousand tons. I doubt if you need to cover that
section all the way out to the southern entrance. It's only a single tunnel and represents about
half the total area.
'Wrong. Even though that area isn't inhabited, the shock wave of a near miss could collapse the
tunnels on us here,' Dr. Kelvin answered.
'OK, then you need to cover more than 10 miles out from the top of the rim,' Larry said.
Dr. Kelvin hesitated. 'You're right. Let's check.' He turned to the computer. 'Assuming that the
largest meteoroid they can start moving, without being detected and intercepted, is about 100 feet
on a side ... iron ... I wonder if some kind of quake barriers ... hmmm ...'
A few minutes later he looked up again and said, 'We convert Copernicus into a free standing
triangular prism. We go out about 10 miles on each side of the Dome and cut a slot a few feet wide
to a depth of about a mile below our lowest level, which is about even with the crater floor, and
plate the slot. That will save about 20 per cent of the amount of copper needed but we'll probably
use it anyway, since we won't be able to control the plating process in the slot as well as we can
on the open surface. The slots will be a lot of trouble but we need them for shock protection.'
'What weight of copper do you estimate?'
'Roughly 25 thousand tons.'
Larry smiled. 'When can you start?'
'Well, I've got a lot of work to do,' Dr. Kelvin said, looking at the paperwork on his desk. He
looked up and smiled. 'How about an hour from now?'
'The Himalaya will deliver 14 cylinders of copper, 9 feet in diameter and 60 feet long, in three
days. The remaining amount up to an additional 10 thousand tons will be delivered in any standard
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