80. Submarine Float Signal Mk 1 Mod 1 is for day use and is similar in appearance and operation to submarine emergency identifiaction signals, but does not project a grenade. It is ejected from the submarine signal ejector and, on rising to the surface, floats and emits either black smoke or green smoke, for about 15 seconds. The base of the Subma-rine Float Signal Mk 1 Mod 1 contains the same firing mechanism as submarine emergen-cy identification signals, and the closing cap is marked to show the color of the smoke. Fig. 34 shows the arrangment of the compontens and the firing mechansim of the signal. The delay train within the signal has a time lag of approximately 22 seconds from the time of ejection by the signal ejector to the time when the primer is fired. Visibilty in good weather is approximately six miles.

Figure 34. – Submarine Float Signal Mk 1 Mod 1

Operation

81. This signal is handled and fired in the same manner as submarine emergency identi-fication signals, and full instructions are to be found in paragraphs 77, 78, and 79. Sub-marine Float Signal Mk 1 Mod 1 is designed for ejection at depths up to 170 feet and should not be fired below that depth. A new signal to be known as Submarine Float Sig-nal Mk 2 Mod 0 will soon be made available for ejection at depths up to 280 feet.

Packing

82. Submarine Float Signal Mk 1 Mod 1 is packed in wooden containers in units of 25 sig-nals. Each signal is marked on the closing cap to indiacte the color of the smoke.

Stowage

83. The general rules for the stowage of pyrotechnics detailed in paragraphs 9 to 12, in-clusive, apply to Submarine Float Signal Mk 1 Mod 1. No metal stowage boxes are supp-lied for this item, as is done in the case of Submarine Emergency Identification Signals Mk 2 Mod 2.

Safety Precautions

84. All precautions given for the use of submarine emergency identification signals and for the submarine signal ejector must also be taken with Submarine Float Signal Mk 1 Mod 1.