Apparatus for emitting a chemical agent as a vapour comprises operative parts and a decorative cover, the latter being shown in FIG. The system may be implemented in a variety of ways, including as a computer readable medium for facilitating metalized iron transactions. The adhesion should be at least 0. For determining the kind, reference timing when acceleration in a first-axis direction is below a threshold value to take on a minimum value is detected. The primary rate controlling barrier may further comprise or more excipients, dissolved in the lipophilic vehicle, which themselves have rate controlling properties. An optical drop cable 1 comprising: an optical element portion 9 where an optical Fiber core wire 3 and at least one pair of first tension bodies 5 are covered with a cable sheath 7; and a cable support wire portion 15 where a second tension body 11 is covered with a sheath 13, wherein both portions are fixed together and said first tension bodies 5 are composed of a flexible plastic material.