Tracer bullets for aircraft guns, it might be observed, are balls of fire which enable the pilot to see the course his machine gun bullets are taking, so he may correct his fire.
Every vessel built must be registered, and its location is always known from its individual tracer ray.
Ascertaining the stop-number of the tracer ray upon the torpedo which should first reach its destination, Seaton followed it from the stop upon his panel out to the flying messenger.
But there are many possible tracer rays not reactive to a screen such as I was using.
Anything that goes out through it will have a tracer slapped onto it.
Then build me a tracer detector that'll pick it up at high velocity.
In short, by shifting about the pencil, block, and tracer in the different holes you will soon understand the curious properties of your new copying-machine.
Hold thetracer with the right hand, the pencil with the left, and carefully guide the tracer over the outline of your map.
You now want a tracer or stile, for which take a similar screw, and cut off its head by filing the smooth part down to a gently tapering point.
To reverse the map, and keep it of the same size, put the block at C and the tracer at F.
Let the pencil move about as it pleases, and you will find that whatever the tracer does the pencil will mimic.
Hence you have only to transpose your pencil and tracer, putting the pencil at C and the tracer at A.
Quickly, he typed out the coding, punched the tracer button.
With trembling fingers, he typed out the coding, punched the tracer button and sat back, his heart thumping wildly.
Quick-nos'd Tracer first, And Blackfoot give the signal by their yell: Tracer of Crete, and Blackfoot Spartan bred.
The heavens were ablaze with the tell-tale sparkling flashes, while the earth seemed to vomit the fiery trails of tracer shell which crossed and recrossed in all directions.
Further conversation was rudely interrupted by the crash of a gun from ashore, and a thin trail of dim light climbed skywards in a curve as a tracer shell[37] hurtled its way through the air.
A tracershell for use against aircraft has a small cavity in its base filled with composition which is ignited when the gun fires.
Not bothering about them, I kept my sight on one of the balloons and saw the tracer going right into it and causing it to smoke.
For there was not a single sign of Freddy Farmer floating down by parachute anywhere in that tracer bullet and flak burst-filled sky.
There they were, and there were the Mustangs, too, zooming and whirling all over the sky with guns yammering and pounding, and tracersmoke making a crazy crisscross pattern in the dawn air.
And hardly had Dawson seen the silvery paths oftracer bullets cut across the sky before two Nazi Messerschmitts exploded in twin sheets of brilliant red flame that seemed to light up the entire sky for miles and miles around.
Out of the corner of his eye Dave saw tracer bullet smoke weave downward well clear of the Skua, and a tight grin of relief came to his lips.
Its gunners opened up with everything they had, and the air in front of Dave's nose was filled with the wavy streams of tracer smoke.
All the methods use tracer quantities of materials.
In one, a sample of the patient’s blood is withdrawn, stabilized with heparin (to prevent clotting) and incubated with a tracer of radioactive sodium chromate.
The difference is that a scientist can use counting devices to follow the tracer molecules wherever they go.
For several years, iodine-131 has been used as a tracer in determining cardiac output, which is the rate of blood flow from the heart.
When gamma rays emitted by a tracer isotope in the patient’s body struck the scanner, a flashing light produced a dot on photographic film.
If the tracer shows that the cells’ survival time is too short in both recipients to the same degree, the conclusion is that the red cells themselves must be abnormal.
Now sounds the staccato and unexpectedly loud thunder of the machine-gun behind us as the gunlayer begins to direct downwards to one of the searchlights a stream of fiery tracer bullets.
In the direction of Calais, tracer shells, like curving hot coals, moved through the sky continuously.
Only if it holds us, mind, not if it merely tries to find us, or the tracer bullets will give us away.
Lastly, the swift-moving streaks of the fiery tracerbullets from the machine-guns cut across the sky in a dozen directions.
The tracer bullet which we manufactured contained a mixture of barium peroxide and magnesium and in flight burned with the intensity of a calcium light.
Excellent tracer bullets were produced by the National Fireworks Co.
This is done by inserting tracerbullets at intervals in the belts of cartridges fed into the machine gun.
The tracer bullet consisted of a cupronickel shell, the nose of which contained a leaden core to balance the bullet properly.
We at once developed a modified French 11-millimeter tracer incendiary cartridge, which in later use proved to be highly satisfactory.
Special machinery was required for loading the tracer bullet and also for producing the incendiary projectile.
In those seven sectors perhaps a dozen vessels threw out enormous spherical screens of intense red light, and as they did so their tracer points upon all the interlocked lookout plates also became ringed about with red.
I put everything I've got behind a traceron that beam, but haven't been able to lift a single needle off the pin.
I've just got you authorization to lay a tracer alongside that bogey if he refuses to acknowledge your flyby.
Morton figured if giving the guy a flyby didn't get his attention, then Command would want to hand him a little heat, say a tracer from the Tomcat's 20mm cannon.
You have positive authorization to lay onetracer in the vicinity of Icarus Delta One.
Suddenly a blaze streaked past them in the sky as the forward gun fired and a telltale tracer ripped by.
One guiding of the tracer over the curve gives then at once the ten coefficients An and Bn for n = 1 to 5.
If the curve is closed, and the tracer moved round it, the roll will measure the area independent of the position of the axis OX, as will be seen by drawing a figure.
The tracer is then placed on the x-axis of the y-curve and clamped to the carriage, and the instrument is ready for use.
At the same time the frame moves with the tracer in the direction of y.
Let the tracer T be moved, both from the first position OA and the last BA of the rod, along some straight line AX.
When the tracer is placed on the curve at the point [theta] = 0 the one axis is parallel to the axis of [theta].
For a small motion the two wheels will then register just the components required, and during the continued motion of the tracer along the curve the wheels will add these components, and thus give the values of nAn and nBn.
When the rod has been pushed back to Q'Q, the tracer moves along the axis OX.
It is turned by aid of a wire connected with the carriage WW, and turns n times round as the tracer describes the whole length of the curve.
Instead of moving B along the y-curve, a tracer T fixed to the carriage A is guided along it.
Fleischhauer uses three, five or more wheels arranged symmetrically round a tracer whose point is guided along the curve; the planes of the wheels all pass through the tracer, and the wheels can only turn in one direction.
Hereby the sector AOB is again described, and again in the positive sense, if it is remembered that it turns about the tracer T fixed at A.
Small instruments called scanners (see Figure 18) usually are used to track tracer isotopes, but whole body counters are useful in special circumstances.
Sometimes cobalt-60 used as a tracer to measure deterioration of blast furnace walls causes problems in postwar steel, too, so old warship armor is used when possible.
Scanners or other types of instruments are used more typically in followingtracer isotopes.
Scanning devices are commonly used for noting the fate of tracer isotopes in medical diagnosis.
Research on Body Processes Radioactive tracer atoms, either natural or purposefully built into molecules of vital materials like proteins, are revealing how these substances function in the body to produce energy or to form new tissues.
When we know accurately the normal totals and kinds of radioactive substances in the body, we can undertake new kinds of tracer studies without using large amounts of additional radiation.
Describes the use of a liquid scintillator for counting low-energy beta emitters commonly used in biological and medical tracer experiments.
Whole body counters used in tracer studies cause a minimum of inconvenience for the patient.
I knew the meaning of these, machine-gun tracer bullets.
His tracerbullets were going by on the left side, but he corrected his aim, and my motor seemed to be eating them up.
He didn't know that there was a German in the sky, until he saw the tracer bullets.
Nor can I ever forget the peculiar thrill that went through me when I was informed by the head of the agency that a tracer was being sent out for Great-grandfather to call him to the phone.
We'll send out a tracer for him right away," they said.
A tracer bullet seemed to pass right through the aeroplane.
Tracer bullets shot up like lines of light, but so far he had come through untouched.
The end C is fastened to the left side of the drawing board, the picture to be enlarged is placed under the stylus or tracer point, and the paper under the pencil point G.
It is then only necessary to take hold of the pencil and move it over the paper while watching the tracer point to keep it following the lines of the picture.
To make a reduced picture, the original is placed under G, the tracer point changed to G and the pencil to F.
He threw the curve down on his desk and, soothed by the whirring of the tracer motor, fell into a brown study.
She turned ICWEA on and let her warm up, meanwhile fastening a large sheet of paper on the bed of the curve-tracer with tape.
The paper in the curve-tracer was perfectly blank, and there was no punch-card in the transmitter head.
The curve-tracer began to draw a rather abrupt curve, which meandered half across the sheet before Norm realized what it was.
Switch all the power from the Tracer to the newscast beam.
He thought so, but there was another hour of argument before he had overcome Candar's suspicions and convinced him of the absolute necessity of having Astrid to supervise the building of the Tracer and the Drive.
The power of the whole planetary communications system is now being used by Astrid Reine for the tracer system now being built.
The tracer device has already confirmed our belief that Darzent is preparing to attack.
With all the technical resources of Onzar at her disposal, Astrid had a prototype of the tracer in operation the following day.
Thane turned to the tracer that had been installed.
Not that I doubt that you can see it," pursued the Tracer calmly.
The Tracer of Lost Persons' eyes were twinkling as he hung up the receiver and turned in his revolving chair to meet the pretty young woman who had entered in response to his ring.
I beg yours for my impatience," said the Tracer pleasantly.
Then, averting his head, the Tracer of Lost Persons swung open the panel.
Minute after minute passed; the Tracer stood as though turned to stone, gray head bent.
The Tracer of Lost Persons stroked his gray mustache thoughtfully.
The Tracer leaned over the photograph, examining it through the glass.
Gatewood seized the offered hand and wrung it with a fervor out of all reason; and it is curious that the Tracer of Lost Persons did not appear to be astonished.
The Tracer of Lost Persons looked up sharply: "About how much information do you decline to give, Mr. Gatewood?
Why, man, the Pinkerton system itself has become merely a detail in the immense complexity of the system of control which the Tracer of Lost Persons exercises over this entire continent.
I'll bet there's a tracer in the mike and a switch so she can modulate it or key it to send out Morse.
The frame moves in obedience to the action of the tracer, but in a minified degree, and each needle repeats on a scale of one-twentieth the design over which the tracer is moved step by step between each stitch.
The frame holding the cloth is moved by an arrangement of levers under the control of the operator, who conducts a tracer point on the long end of the lever over the design, which is suspended before him.
We discovered tonight that some kind of tracer material had been worked into all your clothes.
It was just possible that the Space Scouts had been able to put that tracer material idea to immediate use.
If they already had spotted me by that tracer material, they could have had an audio pick-up on me, I suppose.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "tracer" in a variety of sentences. We hope that you will now be able to make sentences using this word.
