George Hadley developed Halley's theory of trade winds by taking into account the earth's rotation and the displacement of air by tropical heat. He was born in 1685 and died in 1768. Research Hadley
The subscapularis is a large triangular shoulder muscle that lies on the front surface of the scapula. It originates in the concave area called the subscapular fossa and converges at its lower end into a tendon which inserts in the lesser tuberosity of the humerus. The subscapularis is innervated by the upper and lower subscapular nerves which branch from the fifth and sixth cervical nerves. It is supplied by branches of the subscapular artery. This muscle rotates the head of the humerus when the arms are raised to prevent displacement. It is also used to move the arms forward and down. Research Subscapularis
In optics an aberration is a defect in the image formed by a lens or curved mirror. In chromatic
aberration the image formed by a lens, but not a mirror, has coloured fringes as a result of the different extent to which light of different colours is refracted by glass. It is corrected by using an achromaticlens. In spherical aberration, the rays from the object come to a focus in slightly different positions as a result of the curvature of the lens or mirror. For a mirror receiving light strictly parallel with its axis, this can be corrected by using a parabolic surface rather than a spherical surface. Spherical aberration in lenses is minimized by making both surfaces contribute equally to the ray deviations, and can (though with reduced image brightness) be reduced by the use of diaphragms to let light pass only through the centre part of the lens. In astronomy an aberration is the apparentdisplacement in the position of a star as a result of the earth's motion round the sun. Light appears to come from a point that is slightly displaced in the direction of the earth's motion. The angular displacement a = v/c, where v is the earth's orbitalvelocity and c is the speed of light. Aberration was discovered in 1728 by the English astronomer James Bradley and was the first observational proof that the Earth orbits the Sun.
In astronomy, aberration is a small periodical change of the position in the stars and other heavenly bodies, due to the combined effect of the motion of light and the motion of the observer; this is called annual aberration, when the observer's motion is that of the earth in its orbit, and daily or diurnal aberration, when of the earth on its axis; amounting when greatest, in the former case, to 20.4', and in the latter, to 0.3'. Planetary aberration is that due to the motion of light and the motion of the planet relative to the earth. In optics, aberration is the convergence to different foci, by a lens or mirror, of rays of light emanating from one and the same point, or the deviation of such rays from a single focus; called spherical aberration, when due to the spherical form of the lens or mirror, such form giving different foci for central and marginal rays; and chromatic aberration, when due to different refrangibilities of the coloured rays of the spectrum, those of each colour having a distinct focus. Research Aberration
Dielectric is the name given to any medium through or across which electrostatic induction can take place. The application of an electric field to a dielectric results only in a displacement of electric charge within the material, due to the molecules becoming polarized and orientating themselves in the direction of the electric field. Faraday first showed that electrostatic induction was not action at a distance, but took place by means of the insulating medium separating the two conductors. The medium he named a dielectric, and measured its specific inductive capacity by taking that of common air as unity. Research Dielectric
A spring is an elastic device for linking two objects together so as to allow of relative displacement between them, this being resisted by a force which increases as the displacement becomes greater. The most common forms of metal springs are the spiral - used chiefly for clockwork, helical - which are used to resist extension or compression in the direction of their axes, double spiral, laminated cantilever and laminated semi-elliptic.
Laminated springs are generally employed in vehicles. They are composed of a number of steel plates bound together at the centre or at one end, but free to slide over one another at other points. The length of the plates increases regularly to give the spring the shape of a triangle, or of two triangles set base to base. The plates are curved , so that they will be straightened by the greatest load they are called upon to carry. It is important in a laminated spring that all the plates are of the same width and thickness.
The most perfect form of spring is of air under compression, as it is infinitely elastic and has no limit of strength.
Thorium is radioactive metal element of the tin group with the symbolTh. Thorium was discovered by Berzelius in 1828. It occurs principally in thorite and other rare minerals. It was formerly isolated by displacement by potassium fluothorate, and is a grey metallic powder. It burns brightly in oxygen. Research Thorium
Triangulation is a technique employed in surveying. A base-line is set out in a convenient and level situation and measured with great accuracy. A theodolite is then set up at each end of the base- line, and readings are taken on some prominent point or beacon, giving the angular displacement of the beacon relative to the base-line. A triangle is thus formed, of which the size of the angles and the length of one side are known, and therefore the length of the remaining sides may be calculated. Research Triangulation
In geology, a fault is a dislocation caused by a slipping of rock masses along a plane of facture. The term also describes the dislocated structure resulting from such slipping. The surface along which the dislocated masses have moved is called the fault plane. When this plane is vertical, the fault is a vertical fault; when its inclination is such that the present relative position of the two masses could have been produced by the sliding down, along the fault plane, of the mass on its upper side, the fault is a normal, or gravity, fault. When the fault plane is so inclined that the mass on its upper side has moved up relatively, the fault is then called a reverse (or reversed), thrust, or over thrust, fault. If no vertical displacement has resulted, the fault is then called a horizontal fault. The linear extent of the dislocation measured on the fault plane and in the direction of movement is the displacement; the vertical displacement is the throw; the horizontal displacement is the heave. The direction of the line of intersection of the
fault plane with a horizontal plane is the trend of the fault. A fault is a strike fault when its trend coincides approximately with the strike of associated strata (i.e., the line of intersection of the plane of the strata with a horizontal plane) ; it is a dip fault when its trend is at right angles to the strike; an oblique fault when its trend is oblique to the strike. Oblique faults and dip faults are sometimes called cross faults. A series of closely associated parallel faults are sometimes called step
faults and sometimes distributive faults. Research Fault
CID is an abbreviation for Caller ID
CID is an abbreviation for Central Institute for the Deaf
CID is an abbreviation for Charge Injection Device
CID is an abbreviation for Computer Integrated Design
CID is an abbreviation for Criminal Investigation Department
CID is an abbreviation for Cubic Inch Displacement Research CID
The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
Abbreviations
Research Hadley
