In a TDR-based level measurement device, the device generates an impulse that propagates down a thin wave guide ( also referred to as a probe ) – typically a metal rod or a steel cable.

When land surveying, there may be trees or other obstructions blocking the view from the level gun to the level rod.

In order to " turn " the level gun, one must first take a shot on the rod from the current location and record the elevation.

Keeping the level rod in exactly the same location and elevation, one may move the level gun to a different location where the level rod is still visible.

Record the new elevation seen from the new location of the level rod and use the difference in elevations to find the new elevation of the level gun.

The calculation of noon can be made more easily and accurately with a small, exactly vertical rod driven into level ground -- take the time reading when the shadow is pointing due north ( in the northern hemisphere ).

Marsh surface elevations may be measured with a stadia rod and transit, electronic theodolite, Real-Time Kinematic Global Positioning System, laser level or electronic distance meter ( total station ).

The cup holds liquid if filled below the height of the rod, but once filled above that level, it drains all liquid through the siphon to a hole in its base.

In 1998, the addition of a lightning rod to the top of spire extended the tower's overall height to, which is above sea level.

( Interestingly this threshold varies across different species ; a higher proportion of rod cells in the retina will create a higher threshold level.

Levelling is the measurement of geodetic height using an optical levelling instrument and a level staff or rod having a numbered scale.

They differ from other levels in having a very precise spirit level tube and a micrometer adjustment to raise or lower the line of sight so that the crosshair can be made to coincide with a line on the rod scale and no interpolation is required.

Although there are many variations in design, a common function is to force the opposite wheel's shock absorber, spring or suspension rod to lower, or rise, to a similar level as the other wheel.

Besides designing, manufacturing and marketing the industry standard conventional, Mark II and other rod lift pumping units that are used to lift oil from wells, the Oilfield Division provides pumping unit services ( used unit refurbishment and sale, installation, field service, repair, and parts ) and well automation products and services, through Lufkin Automation, ( pump-off controllers, dynamometers, fluid level analysis, consulting, and training ) that lower the costs of producing oil.

The " fire rod " unleashes fireballs whose strength and range depend on Jazeta's health level ; Other items include the " moonbeam moss " which can illuminate dark rooms ; the " rainbow drop " which allows Jazeta to cross small gaps ; " falcon shoes " which give him extra speed ; medicine which refills his life meter ; magic rings which can transform tough enemies into weaker ones ; hourglasses which temporarily stop enemies ; and wings which can warp him back to the place where he last received a password.

However, he noted that what sets it apart from Zelda are the fire rod, the ability to warp with wings, and a lower difficulty level.

Once the assessment is complete, the next step is a thorough measured survey with a tape, rod and level.

Only recently, and perhaps because a television debate can so effectively dramatize President Kennedy's extraordinary mastery of detail, have the abilities on which the capacity for making distinctions depend begun to be clearly discernible at the level of politics.

There the community, faced with the need to formulate policy on the level of absolute justice, can find the answer to its problem in the absolute truth which it holds as partially experienced.

From this point of view the `` militant mobs '' of the past, stirred into action by one ideology or another, were all composed of `` intellectuals '' -- and this is not the level on which the essence of mankind can be discovered.

A belowground basement can cut the fallout radiation to one-tenth of the outside level.

The interaction effect, which is significant at the level, can be seen best in the contrast of mean scores.

Martin and Stendler present evidence that infants and young children can and do solve many problems at a relatively simple perceptual level simply by combining objects and counting them.

Philosophy can prevent the working scientist from becoming slothful and self-content by noting the assumptions and level at which a hypothesis or theory is framed.

The inner life of congregations will prosper so long as like-minded people of similar social and economic level can fraternize together ; ;

He can even be a mild-voiced little-town guy with big-town ideas and level gray eyes and a heart even Houdini couldn't figure out, how it is unlocked.

It has controversially been argued by some evolutionary scientists such as E. O. Wilson that natural selection can act at the level of non-kin groups to produce adaptations that benefit a non-kin group even if these adaptions are detrimental at the individual level.

It has recently been discovered that the location and extent of a neuron's AIS can be altered by the neuron's level of activity and that these changes are thought to influence the excitability of the neuron.

Other details in the novel can be read at the allegorical level.

According to a World Bank official, a country that has around 12 percent rate of growth or even lower, at the range of 7 to 8 percent, can afford a level of public debt of up to 50 percent.

In order for one to achieve proper, firm and healthy Iman one must practice righteous deeds or else his level of Iman chokes and shrinks and eventually can wither away if one does not practice Islam long enough, hence the depth of practicing Islam is good deeds.

It can be reached by underground railway ( although the stations are at a distance from the Park and at a much lower level below the hill ), by city buses, or by commercial tourist buses.

At the molecular level, an antigen can sometimes be characterized by its ability to be " bound " at the antigen-binding site of an antibody.

Art can be difficult at the metaphysical and ontological levels as well as at the value theory level.

On a more abstract level, model theoretic arguments hold that a given set of symbols in a theory can be mapped onto any number of sets of real-world objects — each set being a " model " of the theory — providing the interrelationships between the objects are the same.

This anatomic zonation can be appreciated at the microscopic level, where each zone can be recognized and distinguished from one another based on structural and anatomic characteristics.

The zona fasciculata secretes a basal level of cortisol but can also produce bursts of the hormone in response to adrenocorticotropic hormone ( ACTH ) from the anterior pituitary.

The University can rarely provide all the necessary training in first hand experience that an apprenticeship can, and therefore in addition to graduate level training the profession also tends towards encouraging conservation students to spend time as an intern.

# VBR-Variable bit rate: an average or Sustainable Cell Rate ( SCR ) is specified, which can peak at a certain level, a PCR, for a maximum interval before being problematic.

ground meats are usually prepared from scrap meats at the local level, whereas irradiation at economic volumes of production would require central processing and distribution facilities.

This was because a shot that started at knee level would reveal the weapon of a cowboy, usually holstered at his waist.

The level of protection also usually varies considerably throughout the individual vehicle too, depending on the role of the vehicle and the likely direction of attack.

* Meteorological data: historically these were usually divisional level specialist teams but advances in technology mean they are now increasingly part of artillery units.

) or " plus or minus 1dB " ( roughly the sound level difference people usually can detect ).

In women, the breasts overlay the pectoralis major muscles and usually extend from the level of the second rib to the level of the sixth rib in the front of the human rib cage ; thus, the breasts cover much of the chest area and the chest walls.

Protracted symptoms tend to resemble those seen during the first couple of months of withdrawal but usually are of a sub acute level of severity.

This is two levels below a Bachelor's degree ( Level 6 in the MQF ) and students within the system who intend to further their studies to that level will usually seek entry into Advanced Diploma programs in public universities, polytechnics or accredited private providers.

Citizenship most usually relates to membership of the nation state, but the term can also apply at the subnational level.

* To provide resilience in the event of computer failure, multiple DNS servers are usually provided for coverage of each domain, and at the top level, thirteen very powerful root servers exist, with additional " copies " of several of them distributed worldwide via Anycast.

External views requirements may modify the design of the conceptual level ( i. e., add / remove entities and relationships ), but usually a well designed conceptual level for an application well supports most of the needed external views.

While the conceptual and external levels design can usually be done independently of any DBMS ( DBMS-independent design software packages exist, possibly with interfaces to some specific popular DBMSs ), the internal level design highly relies on the capabilities and internal data structure of the specific DBMS utilized ( see the Implementation section below ).

In the United States scholastic diving at the high school level is usually limited to one meter diving ( but some schools use three meter springboards .).

or A. Mus. D ) degrees in double bass performance provide an opportunity for advanced study at the highest artistic and pedagogical level, requiring usually an additional 54 + credit hours beyond a Master's degree ( which is about 30 + credits beyond a Bachelor's degree ).

To be eligible for a MD degree in the UK one must already hold an entry level medical degree ( for example, MBBS, MBChB, BMed, or a North American MD degree ) and usually must have had at least 5 years of post graduate training and experience.

The second level is a sort of implicit inference that usually follows immediately the episode of knowing p ( knowledge simpliciter ).

At the high school level, it is not uncommon to see multi-purpose goal posts that include football goal posts at the top and a soccer net at the bottom ; these are usually seen at smaller schools and in multi-purpose stadiums where facilities are used for multiple sports.

They place, level, and move the dolly track, then push and pull the dolly, and usually a Camera Operator and Camera Assistant as riders.

They usually offer integration with lower level DLLs generated from a typical 3GL for when the need arise for more hardware / OS specific operations.

This occurs because excited molecules usually decay to the lowest vibrational level of the excited state before fluorescence emission takes place.

Food production in 1946 – 48 was only two-thirds of the prewar level, while grain and meat shipments – which usually supplied 25 % of the food – no longer arrived from the East.

The number of hormone molecules available for complex formation is usually the key factor in determining the level at which signal transduction pathways are activated, the number of hormone molecules available being determined by the concentration of circulating hormone, which is in turn influenced by the level and rate at which they are secreted by biosynthetic cells.