Astounding Stories of Super-Science April 1930 Part 49

When the belt was brought, the Doctor turned to Carnes.

"Carnes," he said, "hook on this life saver and climb out on the window ledge. Take this piece of apparatus with you."

He handed Carnes a piece of apparatus which looked like two telescopes fastened to a base, with a screw adjustment for altering the angles of the barrels.

Carnes took it and looked at it inquiringly.

"That is what I was making at the Bureau last night," explained Dr.

Bird. "It is a device which will enable me to locate the source of the beam which was reflected from this pane of gla.s.s onto the President's pillow. I'll show you how to work it. You know that when light is reflected the angle of reflection always equals the angle of incidence?

Well, you place these three feet against the pane of gla.s.s, thus putting the base of the instrument in a plane parallel to the pane of gla.s.s. By turning these two k.n.o.bs, one of which gives lateral and the other vertical adjustment, you will manipulate the instrument until the first telescope is pointing directly toward the President's pillow. Now notice that the two telescope barrels are fastened together and are connected to the k.n.o.bs, so that when the k.n.o.bs are turned, the scopes are turned in equal and opposite amounts. When one is turned from its present position five degrees to the west, the other automatically turns five degrees to the east. When one is elevated, the other is correspondingly depressed. Thus, when the first tube points toward the pillow, the other will point toward the source of the reflected beam."

"Clever!" e.j.a.c.u.l.a.t.ed Bolton.

"It is rather crude and may not be accurate enough to locate the source exactly, but at least it will give us a pretty good idea of where to look. Given time, a much more accurate instrument could have been made, but two telescopic rifle sights and a theodolite base were all the materials I could find to work with. Climb out, Carnesy, and do your stuff."

Carnes climbed out on the window and fastened the hooks of the life saver to the rings set in the window casings. He sat the base of the instrument against the pane of gla.s.s and manipulated the telescope k.n.o.bs as Dr. Bird signalled from the inside. The scientist was hard to please with the adjustment, but at last the cross hairs of the first telescope were centered on the light in the solarium. He changed his position and stared through the second tube.

"The angle is too acute and the distance too great for accuracy," he said with an air of disappointment. "The beam comes from the roof of a house down along Pennsylvania Avenue, but I can't tell from here which one it is. Take a look, Bolton."

The Chief of the Secret Service stared through the telescope.

"I couldn't be sure, Doctor," he replied. "I can see something on the roof of one of the houses, but I can't tell what it is and I couldn't tell the house when I got in front of it."

"It won't do to make a false move," said the Doctor. "Did you arrange for that plane?"

"It is waiting your orders at the field, Doctor."

"Good. I'll go up to the office of the Chief of Air Service and get in touch with the pilot over the Chief's private line. There are some orders that I wish to give him and some signals to be arranged."

Dr. Bird returned in a few minutes.

"The plane is taking off now and will be over the city soon," he announced. "We'll take a stroll down the Avenue until we are in the vicinity of the house, and then wait for the plane. Carnes will take five of your men and go down behind the house and the rest of us will go in front. Which building do you think it is, Bolton?"

"About the fourth from the corner."

"All right, the men going down the back will take station behind the house next to the corner and the rest of us will get in front of the same building. When the plane comes over, watch it. If you receive no signal, go to the next house and wait for him to make a loop and come over you again. Continue this until the pilot throws a white parachute over. That is the signal that we are covering the right house. When you get that signal, Carnes, leave two men outside and break in with the other three. Get that apparatus on the roof and the men who are operating it. Bolton and I will attack the front door at the same time.

Does everybody understand?"

Murmurs of a.s.sent came from the detail.

"All right, let's go. Carnes, lead out with your men and go half a block ahead so that the two parties will arrive in position at about the same time."

Carnes left the building with five of the operatives. Dr. Bird and Bolton waited for a few minutes and then started down Pennsylvania Avenue, the five men of their squad following at intervals. For three-quarters of a mile they sauntered down the street.

"This should be it, Doctor," said Bolton.

"I think so, and here comes our plane."

They watched the swift scout plane from Langley Field swing down low over the house and then swoop up into the sky again without making a signal. The party walked down the street one house and paused. Again the plane swept over them without sign. As they stopped in front of the next house a white parachute flew from the c.o.c.kpit of the plane and the aircraft, its mission accomplished, veered off to the south toward its hangar.

"This is the place," cried Bolton. "Haggerty and Johnson, you two cover the street. Bemis, take the lower door. The rest come with me."

Followed closely by Dr. Bird and two operatives, Bolton sprinted across the street and up the steps leading to the main entrance of the house.

The door was barred, and he hurled his weight against it without result.

"One side, Bolton," snapped Dr. Bird.

The diminutive Chief drew aside and Dr. Bird's two hundred pounds of bone and muscle crashed against the door. The lock gave and the Doctor barely saved himself from sprawling headlong on the hall floor. A woman's scream rang out, and the Doctor swore under his breath.

"Upstairs! To the roof!" he cried.

Followed by the rest of the party, he sprinted up the stairway which opened before him. Just as he reached the top his way was barred by an Amazonian figure in a green bathrobe.

"Who th' divil arre yer?" demanded an outraged voice.

"Police," snapped Bolton. "One side!"

"Wan side, is it?" demanded the fiery haired Amazon. "The divil a stip ye go until ye till me ye'er bizness. Phwat th' divil arre yer doin' in th' house uv a rayspictable female at this hour uv th' marnin'?"

"One side, I tell you!" cried Bolton as he strove to push past the figure that barred the way.

"Oh, ye wud, wud yer, little mann?" demanded the Irishwoman as she grasped Bolton by the collar and shook him as a terrier does a rat. Dr.

Bird stifled his laughter with difficulty and seized her by the arm.

With a heave on Bolton's collar she raised him from the ground and swung him against the Doctor, knocking him off his feet.

"Hilp! P'lice! Murther!" she screamed at the top of her voice.

"d.a.m.n it, woman, we're on--"

Dr. Bird's voice was cut short by the sound of a pistol shot from the roof, followed by two others. The Irishwoman dropped Bolton and slumped into a sitting position and screamed l.u.s.tily. Bolton and Dr. Bird, with the two operatives at their heels, raced for the roof. Before they reached it another volley of shots rang out, these sounding from the rear of the building. They made their way to the upper floor and found a ladder running to a skylight in the roof. At the foot of the ladder stood one of Carnes' party.

"What is it, Williams?" demanded Bolton.

"I don't know, Chief. Carnes and the other two went up there, and then I heard shooting. My orders were to let no one come down the ladder."

As he spoke, Carnes' head appeared at the skylight.