Two connecting tubes are required.

Two tubes of EDTA-anticoagulated blood.

Two alternatives to the delay line, the Williams tube and Selectron tube, originated in 1946, both using electron beams in glass tubes as means of storage.

Two nine-pin 12AX7 vacuum tubes were mounted in an octal package and had a model K2-P chopper add-on available that would effectively " use up " the non-inverting input.

Two measuring tubes enable measurements of lower air currents (< 30. 000 m³ / h ) as well as higher air currents (< 60. 000 m³ / h ).

Two banks of resonator tubes are laid into grooves in the frame so that they straddle the damper bar.

Two tubes have a liquid flowing in the same direction.

Two tubes have a liquid flowing in opposite directions.

Two additional transoms are put across from the lift on each side of the feature and are joined on both sides with shorter tubes called tie tubes.

“ Two small scalpels, one short grooved director, a tenaculum, two aneurysm needles which may be used as retractors, one pair of artery forceps, haemostatic forceps, two pairs of dissecting forceps, a pair of scissors, a sharp-pointed tenotome, a pair of tracheal forceps, a tracheal dilator, tracheotomy tubes, ligatures, sponges, a flexible catheter, and feathers ”.

Although originally experimented with by the Germans in World War Two, it was not until the 1950s the U. S. began conducting early experiments using multiple tubes in a " cascade ", by coupling the output of an inverting tube to the input of another tube, which allowed for increased amplification of the object light being viewed.

Two types of chemically absorbent tubes are used to sample for a wide range of chemical substances.

Two matched transistors of the same polarity ( or, less often, Vacuum tubes ) can be arranged to supply opposite halves of each cycle without the need for an output transformer, although in doing so the driver circuit often is asymmetric and one transistor will be used in a Common-emitter configuration while the other is used as an Emitter follower.

Two adjoining cells near the common transverse wall give out protuberances known as conjugation tubes, which further form the conjugation canal upon contact.

** Two 21-inch ( 530 mm ) torpedo tubes

Two 21-inch torpedo tubes were fitted, with a payload of seven torpedoes carried.

The BL 7. 2 howitzer was unique, in that it was one of the few artillery pieces used by any side throughout World War Two that relied on a triple mechanism of conventional hydraulic recoil tubes ; brakes on the wheels ; and wheel recoil ramps, to dampen the enormous recoil pressures when fired.

Two parallel tunnel tubes connect the districts of Whiteinch to the north and Govan to the south in the west of the city.

Until World War Two, the world's largest wind tunnel was built in 1929 and located in a suburb of Paris, Chalais-Meudon, France.

By the end of World War Two, the US had built eight new wind tunnels, including the largest one in the world at Moffett Field near Sunnyvale, California, which was designed to test full size aircraft at speeds of less than 250 mph and a vertical wind tunnel at Wright Field, Ohio, where the wind stream is upwards for the testing of models in spin situations and the concepts and engineering designs for the first primitive helicopters flown in the US.

Two of the four ( Richmond and Wimbledon ) western branches of the route are also the only lines across the entire network to cross the Thames by bridge and not by tunnel.

Two of the trail ’ s unique aspects are walking in the canal itself – on a steel flume across a wash and through a tunnel immediately thereafter.

Two road tunnels, the Queensway road tunnel from Birkenhead, and the Kingsway road tunnel from Wallasey, run underneath the River Mersey and connect the town to Liverpool.

Two wings, one with no sweep, and one with 45 degrees of sweep were tested at Mach numbers of 0. 7 and 0. 9 in the 11 x 13 cm wind tunnel.

Two sides of the wye are built on tall trestles and one side is a tunnel bored through solid rock.

Two to five white, oval eggs are laid in a nest is made of bark fibre, rootlets and fine grass, and placed in tree hollow, a tunnel excavated in the side of a bank or within crevices in man made objects.

Two electronic signs on either side of the tunnels can warn drivers if the tunnel is closed in an emergency.

Two Silver Line services operate in a dedicated tunnel from South Station to Boston World Trade Center, and then in a reserved surface right-of-way for another half-mile further east to Silver Line Way station, and then beyond there in mixed traffic:

Two annex fields ( for warm up / training purposes ) are connected directly to the Olympic Stadium with an underground tunnel.

Two trains entered the tunnel behind the incident train: a lone locomotive directly behind train 7539 ( from which the driver evacuated to the service tunnel ) and a Eurostar passenger train behind that ( which reversed out through the French portal ).

Two of the trains were slightly affected by smoke as they passed through on their way to France and one was instructed to stop in the tunnel near to the site of the fire in order to act as a rescue train.

Lower portal of " Number Two " tunnel, Spiral Tunnels, Field, British Columbia.

Two proposals were made by the transport companies: the SNCF suggested a new tunnel between Châtelet and Gare de Lyon for Line D of the RER allowing traffic to circulate from the north and south-east of Île-de-France.

Two tourist buses were destroyed by fire outside the tunnel in January and March 2008, though the fires were not related to the tunnel.

Two representative examples of the new technology are the nanotechnology-based tunnel that replaces the bridge and the ad-hoc community built on the damaged bridge.

Two steel murals by Robert Savoie, entitled Kawari Kabuto, grace the walls of the great volume over the tunnel vaults, and a mural in the pedestrian tunnel to the northern entrances is by Jean-Paul Mousseau.

Two contractors were hired to assess the structural integrity of the tunnel, and the delay was estimated at two years.

Two work squads began at each end of the tunnel, and met half way almost 800 metres under the mountain.

Two representatives of those assembled were appointed to carry the news of the union to all the churches: John Rogers, for the Christians and " Raccoon " John Smith for the reformers.

Two designations of homicide that carry no criminal punishment are justifiable and excusable homicide.

Two terminals carry the current from the meter, while the other two allow the meter to measure the voltage across the resistor.

Two people, regardless the sex of either, carry out the work of the group through their continued interaction.

Two 600 kV HVDC lines, each approximately 800 km long, carry both Brazilian and Paraguayan energy to São Paulo where the terminal equipment converts the power to 60 Hz.

Two species of elm bark beetle, one of them native, are known to carry the disease in North America.

Two state highways, State Roads 37 and 67, carry large numbers of daily commuters between the two larger communities.

Two swing bridges carry the Lowestoft to Ipswich railway line and the A12 road over the cut to the east of the lock.

Two institutions, the Carney Library and the Carney Elementary School, also carry the name.

Two attempts to carry the works by storm during the Siege of Port Hudson, as at Vicksburg, were dismal failures.

Two BBC animations carry on the legend by introducing Rudolph's son, Robbie the Reindeer.

Two British officers believed they had determined an opening to carry the war to the German fleet.

Two well-known personalities carry this name:

The ' Two Cent Reds ' were among the last stamps used to carry a letter for 2 cents, the rate changing to 3 cents on July 6, 1932.

Two representatives of those assembled were appointed to carry the news of the union to all the churches: John Rogers, for the Christians and " Raccoon " John Smith for the reformers.

Two signals, B-Y ( U ) and R-Y ( V ) are used in the PAL system to carry the color information for a picture, with the phase of the V signal ( hue ) reversed ( i. e. shifted through 180 degrees ) on alternate lines ( hence the name PAL, or phase alternate line ).

Two men dressed as colonial soldiers carry a banner, exploding firecrackers, commemorating Guy Fawkes and his co-conspirators as part of Lewes Bonfire Night celebrations.

Two of his goals came against Romania in Cameroon's second game, and two more came in extra time against Colombia in the last 16 to carry Cameroon to the quarter-finals, the furthest an African team had ever advanced at the World Cup ( Senegal matched this feat in 2002, and Ghana matched it in 2010 ).

Two bombers were arrested before they could carry out attacks.

Conversely, in markets where CTV Two is not available, some CTV affiliates may sometimes carry some CTV Two programming, although this is rare.

Two delegates were sent by the German government to carry out the signing of the protocol, Baron Kurt von Lersner and Herr von Simson.

Major digital television channels in Europe ( for example, the five major UK terrestrial TV channels of BBC One, BBC Two, ITV, Channel 4 and Channel 5 ), as well as Australia, carry anamorphic widescreen programming in standard definition.