them signals. They are on the frequency of neutral hydrogen, but it's hard to believe they're natural in origin. We've about concluded that somehow our amplifier system is modulating the incoming hydrogen signal from the antenna. The trouble is, we can't locate the cause."
"Is that why you called Dr. Winston?" Rick asked.
"Yes. He has a reputation for finding bugs in electronic circuits. If he can find this one, we'll be tempted to reward him with a pyramid or something appropriate."
Rick saw the twinkle in Dr. Farid's eyes. "Better not make it a pyramid," he said hastily. "His luggage is limited to sixty-six pounds. They might not let him on the plane with it."
"A happy thought," Dr. Farid said seriously. "You have saved us from possible embarrassment. It would be useless to give him a pyramid when his weight limit is thirty kilos, as we call sixty-six pounds."
Rick chuckled. One reason he so enjoyed his association with scientists was the dry sense of humor most of them seemed to share.
They reached the administration building and started through the formalities of customs and immigration. The Americans had filled out customs forms and currency declarations on the plane, and in only a short time the formalities were over and their admission into the United Arab Republic was official. The customs inspectors hadn't even asked them to open their luggage.
The trip from the airport took over an hour. It led through Heliopolis, City of the Sun, the first capital of a united Egypt. The land had been governed for over a thousand years from Heliopolis. But that, as Dr. Kerama explained, was over four thousand years ago.
Rick was awed. Coming from a new land where a hundred years seemed a very long time, the antiquity of Egypt stirred his imagination. But there was little that seemed ancient in modern Heliopolis. There were attractive, modern apartment houses, new public buildings, and rows of trees carefully trimmed into perfect green cylinders.
The entry into Cairo itself was through rows of tall wooden or brick structures, along streets traveled by everything from the latest European cars to plodding donkey carts. The people were dressed in a variety of costumes, from suits and dresses that would have been suitable in New York, to traditional Arab dress with flowing robes and the cloth headdress that is held in place by a band or roll of fabric around the head, just above the eyes.
The car passed the railroad station and the great statue of Rameses the Second, Pharaoh of Egypt. The Nile came into view, and Farid pointed out the row of hotels on the other side. The Shepheard's and the Nile Hilton flanked the older, Victorian bulk of the Semiramis, where they would stay. They sped across a bridge, entered a plaza full of honking horns and speeding cars, then moved to the comparative quiet of a street along the Nile embankment to the hotel.
Uniformed attendants came running for their bags. The group entered the lobby, and Rick looked around with interest.
The Semiramis was big, with lofty ceilings and chandeliers. The walls were decorated with scrolls and tapestries. The rugs had once been red. There was a kind of eighteenth-century grandeur about it, even though it had turned a little shabby over the years.
The formalities of registration were completed, then the Americans went to the cashier and exchanged dollars for Egyptian pounds and coins in units called piastres. They carefully put away their receipts for the exchange, since currency control in the country was strict.
"Go ahead," Winston told the boys. "Farid and Kerama will come with me. I want to start talking over this interesting problem of theirs, and I imagine you want to rest."
Rick did not feel in the least like resting, but made no comment. He and Scotty got into a tiny, ornate elevator cage with walls of gilded-iron lattice. There wasn't room for the porters with their bags; they ran up the stairs while the boys rode with the smiling elevator operator. It wasn't a fast ride.
"Climbing rate, one hundred feet per minute," Scotty said. Rick grinned.
They were let off at the third floor, and weren't in the least surprised to find the porters waiting for them. They followed the men into a room that made them stop short with amazement.
The entrance to the hotel and the lobby had been big, but the room was enormous, spacious, and very tastefully furnished, European style.
"As big as Grand Central Station!" Scotty exclaimed.
Rick echoed, "We'll rattle around in here like a pair of pebbles in a fifty-gallon tank."
The bath was larger than most American hotel rooms, with a twenty-foot ceiling, and the closet would easily have accommodated a king's wardrobe. Rick thought that maybe it had, in times past.
He tipped the porters and closed the door behind them, then motioned to Scotty. "Go on down to the other end of the room and shout. I want to see if I can hear you."
Scotty started to oblige, grinning, then turned and called, "Come look at this view!" He had discovered that the French doors at the front of the room opened onto a tiny balcony that overlooked the Nile.
The great river was only the width of a narrow street away. Sailing gracefully along with brown sail set was a Nile boat. The bridge they had crossed was directly ahead of the boat, and Rick looked for the drawspan through which it would pass. There was none!
"He'll crash right into the bridge!" Rick exclaimed. "Why doesn't he correct his course?"
"Rudder stuck, maybe," Scotty offered. "But why doesn't he drop the sail and try to lose headway?"
They watched helplessly as the boat, fully fifty feet in length, bore down on the bridge. There were many people in sight, and a steady line of cars crossing the bridge, but no one paid the slightest attention.
Scotty grabbed Rick's arm. He started to laugh. "Look at that mast!"
Fascinated, Rick watched as the huge mast dipped slowly backward, triangular sail and all, until it lay nearly flat on the deck. The boat slipped under the bridge with room to spare. On the other side, the mast slowly went up to its normal rakish position again, the sail filled, and wind and current bore the boat steadily down the Nile.
"Not exactly the way we'd do it," Rick said with a grin, "but pretty effective." It was a reminder that they were in a new land, where customs were strange to them.
"You learn something new every day," Scotty agreed. "Let's unpack, then go visit the city."
"Better wait and see what Winston has in mind for us," Rick cautioned. He began to stow his clothing in one of the big dressers. He lifted a shirt, and stared down at the Egyptian cat nestling among his T shirts. "Tell you what, if Winston doesn't need us, let's deliver the cat. We can see some of the city coming and going."
When their clothes were stored, they washed away the grime of travel and Rick called Winston's room.
Hakim Farid answered. "Don't think we've forgotten you," the young radio astronomer said. "But Parnell and Kerama wasted no time in getting down to business. I doubt that you could interrupt long enough to get a sensible answer. Do you have any plans?"
"We have an errand at El Mouski," Rick replied. "Would it be all right for us to go?"
"No reason why not. You'll need a car. I would offer you mine, except that you have no local license. You could take a taxi, but a licensed dragoman would be better. Suppose I suggest one with a car?"
Rick remembered that Bartouki had told them a dragoman was a guide-interpreter. "That would be very good of you," he replied.
"All right. I will send one I know, or a friend of his if he is not available. Wait in your room and he will come for you."
Rick thanked Farid and hung up. He reported the conversation to Scotty.
"First time I've ever had a guide in a city," Scotty said. "Makes me feel important, like visiting royalty or something. Couldn't we just get a map instead?"
"We'd still need a car. Might as well get one with a built-in talking map. Besides, I like the idea. I want to be escorted like a visiting prime minister."
There was a paper laundry bag in the closet. Rick used it to wrap the cat against possible scratches. Scotty took the few moments to get some cards written,