7.  A person holding a position on the date said position is classified under the civil-service act shall be entitled to all the rights and benefits possessed by persons of the same class or grade appointed upon examination under the provisions of said act.

  RULE III.

1.  All that part of the executive civil service of the United States which has been or may hereafter be classified under the civil-service act shall be arranged in branches as follows:  The departmental service, the custom-house service, the post-office service, the Government printing service, and the internal-revenue service.

2.  The departmental service shall include officers and employees as follows, except those in the service of the Government Printing Office and in the service of the several custom-houses, post-offices, and internal-revenue districts: 

(a) All officers and employees, of whatever designation, except persons merely employed as laborers or workmen and persons who have been nominated for confirmation by the Senate, however or for whatever purpose employed, whether compensated by a fixed salary or otherwise, who are serving in or on detail from—­

    The several Executive Departments, the commissions, and offices
      in the District of Columbia.

    The railway mail service.

    The Indian service.

    The several pension agencies.

    The steamboat-inspection service.

    The marine-hospital service.

    The light-house service.

    The life-saving service.

    The several mints and assay offices.

    The revenue-cutter service.

    The force employed under custodians of public buildings.

    The several subtreasuries.

    The engineer department at large.

  (b) All executive officers and employees outside of the District
  of Columbia not covered in (a), of whatever designation, whether
  compensated by a fixed salary or otherwise—­

    Who are serving in a clerical capacity or whose duties are in whole or
    in part of a clerical nature.

    Who are serving in the capacity of watchman or messenger.

    Who are serving in the capacity of physician, hospital steward, nurse,
    or whose duties are of a medical nature.

    Who are serving in the capacity of draftsman, civil engineer, steam
    engineer, electrical engineer, computer, or fireman.

    Who are in the service of the Supervising Architect’s Office in the
    capacity of superintendent of construction, superintendent of repair,
    or foreman.

    Who are in the service of the Treasury Department in any capacity
    except those in the life-saving service.