angle of sight
51Rifleman's rule — is a rule of thumb that allows a rifleman to accurately fire a rifle that has been calibrated for horizontal targets at uphill or downhill targets. The rule provides an equivalent horizontal range setting for engaging a target at a known uphill… …
52Norden bombsight — The Norden bombsight at the Computer History Museum in Mountain View, California. This example does not have the associated autopilot attached …
53Intercept method — The Intercept Method , or Marcq St Hilaire method , as it is also rather inaccurately known, is an astronomical navigation method of calculating an observer s position on earth. It was originally called the azimuth intercept method because the… …
54Ordnance QF 18 pounder — Australian gun crew in action in the Ypres sector, 28 September 1917 Type Field gun Place& …
55Celestial navigation — Celestial navigation, also known as astronavigation, is a position fixing technique that was devised to help sailors cross the featureless oceans without having to rely on dead reckoning to enable them to strike land. Celestial navigation uses… …
56Accurizing — is the process of improving the accuracy of a firearm or airgun.cite web |url=http://saami.org/Glossary/index.cfm |title=SAAMI glossary |accessdate=2007 08 30] For firearms, accuracy is defined as the ability to hit exactly what you re aiming at …
57Torpedo Data Computer — The Torpedo Data Computer (TDC) was an early electromechanical analog computer used for torpedo fire control on American submarines during World War II (see Figure 1). Britain, Germany, and Japan also developed automated torpedo fire control… …
58Backstaff — Not to be confused with Ballastella. Davis quadrant from the beginning of the 18th century The backstaff or back quadrant is a navigational instrument that was used to measure the altitude of a celestial body, in particular the sun or moon. When… …
59Longitude by chronometer — Longitude by Chronometer, known by mariners as Long by Chron , is an astronomical navigation method of calculating an observer s position on earth. The method gives the observer a position line on which the observer is situated. Usually the… …
60drafting — /draf ting, drahf /, n. See mechanical drawing. [1875 80; DRAFT + ING1] * * * Precise graphical representation of a structure, machine, or its component parts that communicates the intent of a technical design to the fabricator (or the… …
