Glossary A
Air service revolves around the total of scheduled and nonscheduled service.
Aid telescope also known as low vision telescope is described as telescopic optical system, Galilean or Keplerian that forms a magnified retinal image of an object.
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Astronomical telescope makes reference to compound optical system, afocal in normal adjustment, consisting of a positive objective element or group and a positive ocular element or group forming a magnified, inverted image.
Ash yield pertains to the percentage of material remaining after a fuel is burned; that portion of a laboratory sample remaining after heating under standard conditions to constant weight; i.e., until all the combustible matter has been burned away.