light. For example, light-colored paint is used in the interior of the ship to distribute natural and artificial light  to  the  best  advantage.  These  same  properties  of reflection  and  absorption,  incidentally,  make  camou- flage painting possible. For these and other reasons, the Navy uses a great deal of paint. Recommended  Painting  Procedures As you know, there are many kinds of paint. For example, you cannot use the same type of paint on the deck, topside, and bulkheads in the captain’s cabin. There  is  a  different  paint  made  for  almost  every  pur- pose. Detailed instructions on the proper paint to use for each  job  may  be  found  in  the  applicable  NAVSEA instructions. The most important single factor in securing good paint  performance  is  proper  surface  preparation.  Dirt, oil, grease, and rust or mill scale must be removed completely, and the surface must be thoroughly dry. Equipment used to prepare surfaces includes hand tools, power tools, sandblasters and shot blasters, soap (or detergents) and water, and various paint and varnish removers. Each year the Navy spends thousands of dollars developing and testing finishes for specific surfaces. Consequently, you have the best material available. If you  prepare  the  surface  properly,  use  the  recom- mended finish, and apply the finish correctly, you can have a first-rate job that lasts a long time. Do not use any material not provided by or methods not recom- mended by the Navy. Lubrication  and  Inspection Preservation of equipment and spare parts is a con- tinuous job aboard a ship. The moist salt air causes rust to form in a very short time. The operation and mainte- nance manual for each particular item will indicate the type of preservation to be used and which parts should be painted. Moving parts must be kept free of corrosion by application of the proper lubricant. Parts that cannot be painted and that are not used very often should be coated with a preservative compound that is readily removable with solvents or can be wiped off. Dirt and rust should be  removed  carefully  before  applying  preservatives  or lubricants. Such items as webbing and rubber goods require no  preservative;  however,  they  should  be  stowed  in  a clean,  dry  place  when  not  in  use.  These  items  are subject  to  deterioration  because  of  age  and  should  be inspected   frequently.   When   the   over-age   date (stamped on the webbing) is reached, the material should  be  discarded  and  replaced. BLUEPRINTS  AND  DRAWINGS LEARNING  OBJECTIVE:  Describe  the  infor- mation contained in blueprints, charts, and drawings. All  ABFs  must  be  able  to  read  blueprints  and drawings.  As  you  advance  in  rating,  you  are  expected to be able to make sketches and drawings. A sketch is made freehand and shows rough out- lines and only those details that are necessary to visu- alize a system or an object. A drawing is similar to a sketch, but it is made with mechanical drawing instru- ments and is drawn to scale. A blueprint is a duplicate of a drawing or sketch. Usually,  only  accurate  drawings  are  blueprinted. These  blueprints  are  furnished  by  the  manufacturers of the machinery and equipment installed and used aboard ship, and also by the personnel concerned with the building and maintenance of the ship. Mechanical drawing is a special language and is defined as follows: “A language which uses lines, sym- bols,  dimensions,  and  notations  to  accurately  describe the form, size, kind of material, finish, and construction of an object.” Blueprints are the link between the engineers who design equipment and the people who build, maintain. and repair it. In a comparatively little space, they give a great deal of information in a universal language easily  understood. Of the many types of blueprints you may use aboard ship, the simplest one is the plan view. This blueprint shows the position, location, and use of the various parts of the ship. You may use plan views to find your duty and battle stations, the sick bay, the barbershop, and other parts of the ship. In addition to plan views, you will find aboard ship other  blueprints  called  assembly  prints.  These  prints show  various  kinds  of  machinery  and  mechanical equipment. Assembly prints show the various parts of the mechanism, how the parts fit together, and their relation  to  each  other. Individual mechanisms, such as motors and pumps, are shown on unit or subassembly prints. These show location.  shape.  size,  and  relationships  of  the  parts  of the subassembly or unit. Assembly and subassembly 2-34