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=== Usage ===
=== Creation ===A dioptra is a somewhat difficult item to make. Assuming you use a [[protractorsight]] of about equal quality to your blacksmithing skill it can be created with as low as 30 skill in blacksmithing. It is recommended to improve the protractor sight first before you try to create it in order to increase the success rate. The quality of protractor sight affects creation chance.
===See also===
Updated description with Cartography use, and that you need to target celestial objects to find your location
{{ItemBox
|name=Dioptra
|image=dioptra2.jpg
|active=[[protractor]]
|passive=[[sight]]
|note=* Improve with a [[bronze lump]].
}}[[CDB|Main]] / [[Skills]] / [[Smithing]] / [[Blacksmithing]] / '''{{PAGENAME}}'''
== Description ==
''An astronomical and surveying instrument, mounted on a tripod.''
The [[dioptra]] is a tool that, along with a [[range pole]], is used primarily in [[bridgeCartography]] planning, along with a and [[range polebridge]]planning. It may also be used to get a general idea of your locationby targeting celestial objects like [[Haven_(moon)|Haven]].
==== Surveying ====
:A dioptra is utilized by activating it and right-clicking another player holding a range pole. There will be a '''Survey''' option with automatic event log messages as follows:
:{{event|inline|As your helper is stood in water, you work out how high you are above the water, and it is <xx>.}}
:Can also be used in a cave to determine the slope to the helper holding the range pole.
:{{event|inline|The range pole is <xx> tiles straight West of you. Also you appear to be <xx> dirt lower than the range pole.}}
==== Navigation ====
:Activate the dioptra and right-click any of Wurm's [[moons]] or [[Sol]] and select '''Use'''. Your general geographical location will be displayed in the event window.
:{{event|inline|You carefully place the dioptra on its tripod in front of you.<br>You make sure the dioptra is level.<br>You line up the dioptra with <moon>.<br>You work out you are in the <location> regions.<br>You pack up the dioptra.}}
==== Bridge planning ====
:A dioptra is utilized by activating it and right-clicking another player holding a [[range pole]]. There will be a '''Plan Bridge''' option which will proceed to plan the bridge with automatic event log messages as follows:
:Should there be any reason why the bridge can not be planned, it will interrupt the sequence with the appropriate message.
* The dioptra uses 0.025 kgs of [[bronze lump]] to improve.
* A starter [[compass]] may be be used in the creation.
*90 blacksmithing skill, 14ql protractor sight gives 29% chance*66 blacksmithing skill, 14ql protractor sight gives 16% chance; 43ql protractor sight 50% chance*55 blacksmithing skill, 28ql sight gives 28% chance*42 blacksmithing skill, 42ql protractor sight gives 25% chance*31.9 blacksmithing skill, 18ql protractor sight gives 6% chance === Additional Notes ===
*Although brass is used to create the [[protractor]], and bronze is used to create the [[sight]], the finished dioptra tool is bronze and is therefore improved with [[bronze lump]].
*Quality of dioptra affects how long the planned bridge may be.
*The dioptra has a relatively high value and is worth the same as, for example, mooring ropes and door locks of equal quality. [[Get price]] = QL^2 * 0.50.
* [[Range pole]]
* [[Sight]]
