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  2. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    Typical fields in the title block include the drawing title (usually the part name); drawing number (usually the part number); names and/or ID numbers relating to who designed and/or manufactures the part (which involves some complication because design and manufacturing entities for a given part number often change over the years due to ...

  3. Engineering drawing - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing

    Drawing number (same for every sheet of this document, unique for each technical document of the organization) Sheet number and number of sheets (for example, "Sheet 5/7") Date of issue (when the drawing was made) Traditional locations for the title block are the bottom right (most commonly) or the top right or center.

  4. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    For example, "11" represents the number eleven in the decimal or base-10 numeral system (today, the most common system globally), the number three in the binary or base-2 numeral system (used in modern computers), and the number two in the unary numeral system (used in tallying scores). The number the numeral represents is called its value.

  5. Blueprint - Wikipedia

    en.wikipedia.org/wiki/Blueprint

    A blueprint is a reproduction of a technical drawing or engineering drawing using a contact print process on light-sensitive sheets introduced by Sir John Herschel in 1842. [1] The process allowed rapid and accurate production of an unlimited number of copies.

  6. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    "A base is a natural number B whose powers (B multiplied by itself some number of times) are specially designated within a numerical system." [1]: 38 The term is not equivalent to radix, as it applies to all numerical notation systems (not just positional ones with a radix) and most systems of spoken numbers. [1]

  7. Piping and instrumentation diagram - Wikipedia

    en.wikipedia.org/wiki/Piping_and_instrumentation...

    The identifications consist of up to 5 letters. The first identification letter is for the measured value, the second is a modifier, 3rd indicates passive/readout function, 4th - active/output function, and the 5th is the function modifier. This is followed by loop number, which is unique to that loop.

  8. GWR locomotive numbering and classification - Wikipedia

    en.wikipedia.org/wiki/GWR_locomotive_numbering...

    Initially standard gauge locomotive numbering was a simple sequential system, starting from 1. Numbering in this series, which included new locomotives and those absorbed from other railways, eventually reached 1297. New locomotives were identified as being paid from either revenue or capital account.

  9. North American railroad signaling - Wikipedia

    en.wikipedia.org/wiki/North_American_railroad...

    In Canada, fully signalled lines use CTC, where signal indication is the authority for movement. This system is supervised by a rail traffic controller (RTC), who is in continual communication with the trains and engines on his territory. The RTC can line routes and give permissive signal requests to the system in the field from a central location.