Fox looked at him shrewdly. “Does this trip have anything to do with the plans that you mentioned a few days ago?”

“Perhaps. Let us just say that I need much information about this country before I can think about finalizing my intentions. But I will need your aid, Count.”

“You have it, surely you have it.” He paced the cabin, deep in thought. “But we must make careful preparations if this rather — should I say adventurous? — plan can succeed. Your hair and beard will need re-dyeing if they are not to arouse suspicion. I will take a trip ashore in the morning to buy us suitable clothes, though God knows what gentlemen’s attire I will find here. Then I must buy tickets — first-class tickets — and I assume you have looked closely at your Bradshaw and have worked out a schedule?”

“I have.” Sherman took a slip of paper from his jacket pocket and passed it over. “These are the trains we will take. With proper preparations I feel that this trip will be a successful one.”

“Well then!” the Count said, clapping his hands happily. “We must have some champagne and drink to a prosperous journey.”

General Ramsey, head of the United States Army Ordnance Department, had traveled down from Washington City to Newport News, Virginia, on the previous afternoon. He had enjoyed a good meal and a pipe in the bar afterward, then passed a pleasant night in the hotel. He was happy to be away from the endless labors of his position in the War Department for at least a few hours. Now, well relaxed, he was having a coffee in the station cafe when he saw a plump man pause at the entrance and look around. Ramsey stood so that the newcomer could see his uniform. The man hurried over.

“You are General Ramsey, sir? I received your message and I am most sorry to be tardy.”

“Not at all, Mr. Davis.” Ramsey took his watch from his pocket and glanced at it. “I have been informed that the train is running late, so we have plenty of time. Please join me. The coffee here is, if not wonderful, at least drinkable. You are, as I understand it, John Ericsson’s works manager?”

“I have that pleasure.”

“Then perhaps you can enlighten me about your employer’s message. He simply asked that I appear here today with at least one general officer, an officer who has had field experience. That is why I contacted General Grant, who will be arriving on the next train. But I am most curious as to the meaning of this invitation. Could you enlighten me?”

Davis mopped his sweating forehead with a red bandanna. “I wish that I could, General. But none of us are permitted to speak a word about our work when we are outside of the foundry. I hope that you understand…”

Ramsey frowned, then reluctantly nodded his head. “I am afraid that I do. A great deal of my work is secret as well. Listen — is that a train whistle?”

“I believe that it is.”

“Well then — let us meet General Grant on the platform.”

Grant was the first person off the train. The conductor reached to help him, but he waved the man away. He went slowly, holding on to the exit rail with his left hand, his right arm in a black silk sling. Ramsey stepped forward to greet him.

“I hope I did the right thing by asking you to be here, Ulysses. I was assured that you were on the road to recovery.”

“Very much so — and damn bored with all the sitting around. This little trip will do me worlds of good. If you want to know, your telegram was a gift from the gods. But did I detect an air of mystery in your request?”

“You did, General, you certainly did. But it is all a mystery to me as well. This is Garret Davis, Mr. Ericsson’s works manager. He is also very secretive in the matter.”

“I am most sorry, gentlemen,” Davis said with a weak smile. “But I have specific orders. If you would please come this way — there is a carriage waiting.”

It was a short drive from the station to Ericsson’s shipyard. A high wall surrounded the yard itself and there was an armed soldier guarding the gate. He recognized Davis, saluted the officers, then called out for the gate to be opened. They climbed down from the carriage in front of the main building. Davis moderated his pace to accommodate Grant as they entered the building.

Ericsson himself came out to greet them. “General Ramsey, we have met before. And it is my pleasure now to meet with the very famous General Grant.”

“Excuse me if I don’t shake hands, sir,” said Grant, nodding at his immobilized right arm. “Now permit me to be blunt; I wish to know why we have been summoned here.”

“It will be with great satisfaction that I tell you — indeed show you. If you will follow Mr. Davis.” The Swedish engineer explained as they walked. “I assume that both you gentlemen are acquainted with the steam engine? Of course, you will have traveled on trains, been many times on steamships. So then you will know just how large steam engines must be. This immense size has worried me in the construction of the new ironclads. These new ships are far bigger than my first Monitor, which means that to supply steam to engines that rotate the gun turrets, I must run steam lines about the ship. The lines are very hot and dangerous and therefore require thick insulation. Not only that, but they can be easily broken, and they are unsatisfactory in general. But if I generate steam for each turret engine, I will have created a mechanical monstrosity, with engines and boilers throughout my ship. I am sure that you see my problem. No, I thought, there must be a better solution.”

“Smaller, more self-contained engines to move the turrets?” Ramsey said.

“The very truth! I see that you are an engineer as well as a military man, General. That is indeed what I needed. Since an engine of this type does not exist, I, of necessity, had to invent one myself. This way, please.”

Davis showed them into a large workshop that was well lit by an immense skylight. Ericsson pointed to the squat metal bulk of a black machine. It was about the size of a large steamer trunk.

“My Carnot engine,” he said proudly. “I am sure that you gentlemen know the Carnot cycle. No? Pity. The world should understand this cycle because it is the explanation behind all the forces of energy and propulsion. An ideal cycle consists of four reversible changes in the physical condition of a substance, most useful in thermodynamic theory. We must start with specified values of the variable temperature, specific volume, and pressure the substance undergoes in succession—”

“Excuse me Mr. Ericsson,” General Grant interrupted. “Is that Swedish you are talking?”

“Svensk? Nej. I am speaking English.”

“Well, it could be Swedish as far as I am concerned. I can’t understand a word that you said.”

“Perhaps — if you were less technical,” Ramsey said. “In layman’s language.”

Ericsson drew himself up, anger in his eyes, muttering to himself. With an effort he spoke again.

“All right, then, at its most simple. A quantity of heat is taken from a hot source and some of it is transferred to a colder location — while the balance is transformed into mechanical work. This is how a steam engine works. But the Carnot cycle can be applied to a different machine. That machine is what you see here. My Carnot engine has two cylinders, and is much more compact than any steam engine which must rely on an exterior source of steam to run. Here, using a very volatile liquid I have refined from kerosene, I have succeeded in causing combustion within the cylinders themselves.”

Grant hadn’t the slightest idea what the man was talking about, but Ramsey was nodding agreement. Ericsson signaled to a mechanic who was oiling the engine with a long-spouted can. The man put the can down and seized the handle of a crank that was fixed to the front of the machine. He turned it, faster and faster, then reached over and pulled a lever. The engine burst into life with a thunderous roar, then it poured out a cloud of noxious smoke. Ericsson ignored the smoke, fanning it away from his face, as he pointed to the rear end of the machine at a rapidly rotating fitting. “Power, gentlemen,” he shouted above the din. “Power to rotate the heaviest turret in the biggest ship. And the end of the deadly steam lines.” He reached to pull the control lever back and the roar died away.