Document ID: chunk:federal_register_of_legislation:F2023C00165:reg:6v:p13
Version: federal_register_of_legislation:F2023C00165
Segment Type: reg
Provision Reference: reg 6V (pt 13/19)
Character Range: 159286–162213

containing the reference axis and one containing axis through reference keys.
3/ To be checked by means of a box system, sheets P27W/2 & 3.
    4/ "x" and "y" denote the offset of the axis of the minor (low wattage) filament with respect to the axis of the major (high wattage) filament.
CATEGORY P27/7W

                                                Sheet P27W/7W/2
Screen projection requirements
(a)                 This test is used to determine, by checking whether:
(b)                 the major (high wattage) filament is correctly positioned relative to the reference axis and reference plane and has an axis perpendicular, within +/- 15 degrees, to the plane through the centres of the keys and the reference axis; and whether:
    the minor (low wattage) filament is correctly positioned relative to the major (high wattage) filament, whether a filament lamp complies with the requirements.

Test procedures and requirements.
      1. The filament lamp is placed in a holder capable of being rotated about its axis and having either a calibrated scale or fixed stops corresponding to the angular displacement tolerance limits. The holder is then so rotated that an end view of the major filament is seen on the screen on to which the image of the filament is projected. The end view of that filament shall be obtained within the angular displacement tolerance limits.

2.                   Side elevation
    The filament lamp placed with the cap down, the reference axis vertical, the reference key to the right and the major filament seen end-on:
2.1. the projection of the major filament shall lie entirely within a rectangle of height "a"               and width "b", having its centre at the theoretical position of the centre of the filament;
    2.2. the projection of the minor filament shall lie entirely within a rectangle of width "c" and height "d" having its center at a distance "u" above the theoretical position of the centre of the major filament.

3.                   Front elevation
The filament lamp placed with the cap down and the reference axis vertical, the filament lamp being viewed in a direction at right angles to the axis of the major filament:
3.1. the projection of the major filament shall lie entirely within a rectangle of height "a"               and width "h", centred on the theoretical position of the centre of the filament;
3.2. the centre of the major filament shall not be offset by more than distance "k" from the               reference axis;
3.3. the centre of the minor filament shall not be offset from the reference axis by more               than +/- 2mm (+/- 0.4mm for standard filament lamps).
CATEGORY P7/7W

Sheet P27/7W/3

Reference  a    b    c    d    u
Dimension  3.5  3.0  4.8  5.1

Reference  a    h     k
Dimension  3.5  11.9  1.0

          CATEGORY WY5W

Sheet WY5W/1

DIMENSIONS in mm                                              Filament