ASTM F906-85 (2020) pdf free.Standard Specification for Letters and Numerals for Ships.
This specification specifies shape,size，spacing，andshading of letters and numerals to be used aboard ship.
Characters are of Five Types:
Type 1—Plain letters and numerals (16 units).1.2.2 Type 2—Block letters and numerals (12 units).
Type 3—Type 2 characters with shading (shading——1unit).
Type 4—Block letters (10 units) and numerals (12units).
Type 5—Type 4 characters with shading (shading——1unit).
This specification does not give location or size ofvarious shipboard markings incorporating letters and numerals.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards，Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.
ASTM F906 pdf download.When ordering letters and numerals in accordance withthis specification, it is necessary to state the ASTM designationand the type and height of the character.Characters are designed using the grid method whichallows the size of the character to be changed proportionatelyas required.Type 1,Plain Characters—12 in accordance withFig. 1 unless otherwise noted.Type 2，Block Characters—8 units in accordancewith Fig. 2 unless otherwise noted.Type 3，Block Characters with Shading—Same asType 2 plus 1 unit for shading in accordance with Fig.Type 4,Block Characters，Letters—Width varies.Numerals—8 units.Type 5，Block Characters with Shading—Same asType 4 plus 1 unit for shading.
3Space letters in accordance with Fig. 4;spacing shall be equal to the space following the letter.Numerals shall be spaced in accordance with Table Space letters in accordance with Fig. 5;spacing shall be equal to the space following the letter.Numerals shall be spaced in accordance with Table 1 with 1unit added to each value for shading.Spacing Between Words,After Punctuation, or BetweenSentences:The space between words, after a comma, and after aperiod (as after initials) shall be in accordance with Table 1.3.3.2 The space between sentences shall be in accordancewith Table 1.
The space between a letter and a comma or period (forany use) shall be 2 units.The space between lines shall be equal to one half theheioht of the tallest letter.ASTM F906 pdf download.