Saggar atmosphere, or concentrate the effects of salts, metal oxides and other materials on the surface of their ware. Some pots may be carefully prepared for saggar firing. One method creates a smooth surface covered with clay slip, terra sigillata, which responds particularly well to the saggar technique. This slip covering may be burnished to achieve a gloss. Prepared pots are nestled into saggars filled with beds of combustible materials, such as sawdust, less combustible organic materials, salts and metals. These materials ignite or fume during firing, leaving the pot buried in layers of fine ash. Ware produced in filled saggars
Survival craft transceiver Survival craft transceiver Very high frequency (VHF) survival craft transceivers (SCTs) are lightweight, portable, two-way, handheld VHF transceivers capable of radiotelephone "on-scene communication between rescue units and the survival craft. Essentially these are hand-held VHF radio's that are used in any survival craft, such as a life boat or life raft. " SCTs with re-chargeable type batteries may be used for on-board communications as well. The International Maritime Organization (IMO) requires the following from SCTs: The SCTs used for everyday operations have a rechargeable NiCad battery, and some radios that are strictly SCTs use a non-rechargeable lithium battery pack. These