They were climbing the hill in the night when the headlights abruptly probed solid blackness, became two parallel luminous tubes which broadened out into a faint mist of light and ended.

The contents of the manifold for liquid phase experiments were then mixed by shaking, redistributed to the reaction tubes, frozen down, and each tube was then sealed off.

In a few experiments the tubes were made from standard 6 mm. i.d. Pyrex tubing of 1 mm. wall thickness.

-- In studying the liquid phase thermal reaction, some 70 tubes from 12 different manifold fillings were prepared and analyzed.

Some 80 reaction tubes from 13 manifold fillings were illuminated in the temperature range from 40 to 85-degrees in a further endeavor to determine the cause of the irreproducibility and to obtain information on the activation energy and the effect of light intensity.

The saline tubes were saved and used for the indirect Coombs test in the following manner.

For preparative ultracentrifugation, fractions from the column were concentrated by negative pressure dialysis to volumes of 1 ml or less, transferred to cellulose tubes and diluted to 12 ml with isotonic saline.

Did she know, he asked, why the colors of the tubes were important to people's health??

The arithmetic logic functions were fully electronic, implemented with vacuum tubes.

Relays and vacuum tubes ( thermionic valves ) were commonly used as switching elements ; a useful computer requires thousands or tens of thousands of switching devices.

The first small-scale applications for caesium were as a " getter " in vacuum tubes and in photoelectric cells.

The first electronic programmable digital computer, the ENIAC, using thousands of octal-base radio vacuum tubes, could perform simple calculations involving 20 numbers of ten decimal digits which were held in the vacuum tube accumulators.

In the early cold cathode vacuum tubes, called Crookes tubes, this was done by using a high electrical potential between the anode and the cathode to ionize the residual gas in the tube ; the ions were accelerated by the electric field and released electrons when they collided with the cathode.

These were called Geissler tubes, similar to today's neon signs.

By the 1870s, British physicist William Crookes and others were able to evacuate tubes to a lower pressure, below 10 < sup >− 6 </ sup > atm.

These were called Crookes tubes.

These tubes didn't need gas in them to work, so they were evacuated to a lower pressure, around 10 < sup >− 9 </ sup > atm ( 10 < sup >− 4 </ sup > P ).

This method of measurement is inherited from the method used for the first generation of CRT television, when picture tubes with circular faces were in common use.

Since these circular tubes were used to display rectangular images, the diagonal measurement of the rectangle was equivalent to the diameter of the tube's face.

This method continued even when cathode ray tubes were manufactured as rounded rectangles ; it had the advantage of being a single number specifying the size, and was not confusing when the aspect ratio was universally 4: 3.

The first portable color television, the General Electric Porta-Color, was designed using 13 tubes, 10 of which were Compactrons.

Compactron's integrated valve design helped lower power consumption and heat generation ( they were to tubes what integrated circuits were to transistors ).

Purified inactive chlorine was then added from one of the tubes described above and the mixture frozen out and sealed off in a flask equipped with a break seal.

This light then passed through an exit slit into photomultiplier tubes that produced pulses or " sprays " of electrons.

These pellets are stacked into tubes which are then sealed and called fuel rods.

Cartridge design evolved from simple paper tubes containing black powder and shot, to sealed brass cases with integral primers for ignition, while black powder itself was replaced with cordite, and then other nitro-cellulose-based smokeless powder mixtures, propelling bullets to higher velocities than before.

There are then no longer flux tubes that simply encircle the axis, but, if there is sufficient symmetry in the twist, flux surfaces.

Techniques to produce and maintain better vacua in tubes were then developed.

Nordenfelt then built the Nordenfelt II ( Abdülhamid ) in 1886 and Nordenfelt III ( Abdülmecid ) in 1887, a pair of 30 metre long submarines with twin torpedo tubes, for the Ottoman Navy.

The cold liquid-vapor mixture then travels through the evaporator coil or tubes and is completely vaporized by cooling the warm air ( from the space being refrigerated ) being blown by a fan across the evaporator coil or tubes.

If however both tubes were completely blocked, so that sperm and egg were physically unable to meet, then fertilization of the egg would naturally be impossible, and neither normal pregnancy nor ectopic pregnancy could occur.

The tubes can then be removed after a few days once it is clear that the condition is improving.

With traditional tubal ligation, the surgeon severs the tubes, and then ties ( ligates ) them off thereby preventing the travel of eggs to the uterus.

The process involves running the ingredients through tubes and then extruding the finished product as a soft cylinder, which is then cut into sections and rolled in a mixture of finely powdered cornstarch and confectioner's sugar.

If insufficient current exists through D, then U < sub > OUT </ sub > will be unregulated, and less than the nominal breakdown voltage ( this differs to voltage regulator tubes where the output voltage will be higher than nominal and could rise as high as U < sub > IN </ sub >).

Thousands of variations of the tetrode design, as well as its later development the pentode, have been manufactured since then, although vacuum tubes in low-power equipment have been almost totally superseded by solid-state semiconductor devices.

The immersed tubes of the 63rd Street Tunnel were also fabricated at a shipyard in Port Deposit and then towed to New York City.

He used hollow steel tubes to create the cantilever, and it was then the largest bridge of its kind in the world.

It is also prone to wear in the rear axle trailing arm bearings, which then wear the trailing arm axle tubes, requiring an expensive rebuild or a replacement axle assembly.

As VOR required two VHF receivers as well as a conventional radio for station identification, the system did not become popular until the era of miniaturized electronics, first with small tubes in the 1950s, and then transistorized systems in the 1960s.

These are usually bamboo tubes in diameter and long, filled with either: water and several hundred grams of calcium carbide, or heated kerosene, then ignited by match.

It was made of terracotta tubes partially inserted into each other and arranged in parallel arches, which were then completely covered with mortar.