Section 1 - Pistol and Hand Size Signals: Smoke Grenades AN-M8, M16, M18, and AN-M4Night Drift Signals AN-Mk 4 and AN-Mk 5 Mods 1 and 2; Aircraft Float Light Mk 6 Mods 0 -2
U.S. EXPLOSIVE ORDNANCE
PART 3 - PYROTECHNICS
Chapter 8 - AIRCRAFT PYROTECHNICS
Section 2 - DRIFT SIGNALS

Day Drift Signal Mk 1

Length, inches

 10.0

Maximum diameter, inches

 3.5

Thickness of case, inch

 0.07

Color of slick

Chrome yellow

Use: This signal may be used for a reference point for air navigation.

Description: The case is composed of a waterproofed paper pulp shell pressed in the form of a tear drop, with four fins formed on the tail cone with a diameter approximately the same as the greatest diameter of the nose section. The only other element of this signal is the very fine metallic powder filling which nearly fills the cavity.

Operation: When the signal is dropped into the water, the shell breaks, allowing the powder filling to spread out on the surface and form a slick visible to 15,000 feet.

Remarks: The Day Drift Signal Mk 1 is a Bureau of Aeronautics item. This marker has replaced the Drift Signal M25, which is now obsolete.

Figure 176. Day Drift Signal Mk 1

Section 1 - Pistol and Hand Size Signals: Smoke Grenades AN-M8, M16, M18, and AN-M4Night Drift Signals AN-Mk 4 and AN-Mk 5 Mods 1 and 2; Aircraft Float Light Mk 6 Mods 0 -2