Description of Mechanism free essay sample

The design also varies from manufacturer to manufacturer, but the principle is the same. It holds the mirror and allows for adjustments. Objective Lens Assembly: This is the primary light gathering assembly for a refractor telescope. It is basically a collar which holds the primary lens in place and fits onto the telescope tube. Altazimuth Mount: An Altazimuth or alt-azimuth mount is a simple mount used for moving a telescope along two perpendicular axes of motion, one vertical and one horizontal. The vertical movement is known as the altitude, while the horizontal motion is called the azimuth. Amazon. com offers great deals on altazimuth telescope mounts. Counterbalance: The counterbalance is a simple weight used on a equatorial mount to balance the weight of the telescope optical tube assembly. Proper balance must be maintained to prevent wear on gears. Slow Motion Controls: Used on most mounts, these are a finer set of gears used to make incremental adjustments. We will write a custom essay sample on Description of Mechanism or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page It attaches to the axis gear and the user turns the knob slowly to move the gear in either direction, allowing the user to â€Å"follow† or â€Å"track† objects as the Earth moves. Here’s an example of a Slow Motion Control Unit. Setting Circles: Part of an equatorial mount, setting circles give the correct numerical settings for ascension and declination of sky coordinates. By aligning the numbers with listed coordinates, setting circles can be used to aid the observer in locating deep space objects. Eyepieces: Eyepieces are as wide and varied as telescopes themselves. In essence, a telescope eyepiece is an arrangement of lenses in a barrel-shaped array to aid in image magnification. They come in a wide variety of sizes to match the focuser and an equally wide variety of magnification factors and styles.Amazon. com offers a variety of telescope eyepieces up for grabs! The triple beam balance is a rugged, inexpensive weighing instrument. It is named for the three beams which carry weights. A. The middle beam reads only in 100 g increments. B. The far beam reads only in 10 g increments. The weights in each of these must always sit in a notch. They cannot be placed at arbitrary points on the beam. C. The weight on the front beam can be placed to read continuously from 0 to 10 grams. The Triple Beam Balance is a typical mechanical balance. It has a beam which is supported by a fulcrum.