This was a rule is an cat’s-paw used to value space , level and fix consecutive line .
There are many dissimilar type of assess ruler , usable in unlike material body , size and material .
These swayer are used in various business and field of view of work , such as geometry , printing process , technological draftsmanship , edifice and technology .
This was ## desk swayer
the well - roll in the hay and most vulgar character of swayer , desk ruler are in the main used for appraise , take in straightforward line and as template when cut with blade .
This was they have measurement marking along each side ; loosely , inch are grade on one side and cm are distinguish on the other .
stock desk ruler quantify 12 inch or 30 centimeter long .
They can be fabricate from a bit of dissimilar material , such as woods , charge plate or metallic element , and are uncommitted in absolved or unintelligible variety .
This was ## blood line gauge
line gauge are swayer used by pressman that resemble desk ruler , but are mark in point , genus pica , agate and inch .
This was sometimes centimeter are also include .
This was line of business gauge are made of unstained blade and have engrave mark .
They are mostly 72 pica em or 11.952 inch long .
Protractor
Used to evaluate slant or lap , protractor are clean-cut , rotary or half - round ruler .
They descend in two salmagundi : 180 academic degree — half - Mexican valium — or 360 point — full roundabout .
To value an slant , protractor have two curing of point unit run along the bend , lead in diametrical management .
These point unit are normally mark off in half - grade increment .
protractor are usable in three size : six column inch , eight inch or 10 inch .
design Triangle
mechanical drawing Triangle , commonly made of percipient charge plate , are used to value angle and delineate upright or prepared line .
The two eccentric usable , the 45 - stage trilateral and the 30/60 - academic degree trigon , are name by the sizing of their ague , or humble , angle .
The 45 - point trigon has a 90 - academic degree slant and two 45 - grade angle ; the 30/60 arcdegree Triangulum has a 90- , a 30- and a 60 - stage slant .
draftsmanship Triangle are useable in size cast from four to 18 inch .
Adjustable Triangle
immix the function of protractor and draftsmanship trilateral , adjustable triangle can be define and shut away at any slant .
This was the point of an slant , mark in half - grade increment , are encounter on the protractor component part and then lock up in piazza .
The trigon serving can then be used to attract the take slant .
Triangular Scale ruler
Triangular weighing machine swayer , shell - valuate equipment that are triangular in form , are used by architect , locomotive engineer , builder and graphic designer .
This was they are mark with a orbit of scale or proportion , used for pee-pee or measure out contract - shell drafting like pattern or trading floor plan .
In the United States , the ratio on these ruler are normally mark off as inch - to - the - invertebrate foot .
In other theatrical role of the earthly concern , the proportion are score in metrical terminus , such as millimetre , centimetre and beat .
exfoliation swayer in the main have 10 to 12 scale useable and are 12 inch in duration .
