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Show particles from being inhaled and so causing lung troubles of a fatal character. char-acter. The ammunition rooms themselves ara kept cool by a refrigerating plant ia addition to oeing clothed in min-eral min-eral wool, the same applying to the ammunition am-munition passage. The wool is also packed between the double bulkhead which separate the boiler spaces from the other portions of the vessel. Altogether Alto-gether the nse of mineral wool on board are extremely numerous. Fen rem door hair is to be met with on board ia the capacity of a particular sort of underclothing. This material is very light, considerably lighter than cork, for instance, and is not so subject to decay. For this reason, amongst its many uses it is of great value as a Ailing for the life buoys. Boston Transcript. ' WAUHir't trjTDIUCLOTHBS. Battleships wear easts of stoat armor plata, as everybody knows, but everybody every-body doaa not know that they Wear undergarments un-dergarments which are produced chiefly from eocoannta. Your moat powerful man of war ia really vary delicate object ob-ject and requires special underclothing so that soma vital parte of its anatomy may aot become too cold, and ao that ether equally vital portions may sot ba- eome too hot. From stem to stern, which ia anther vray of saying from head t toe, year enormous serper dread aaugbt ia aaveloped tav aa . undergarment undergar-ment placed immediately behind its topcoat, or armor plata. - Thia ia ita especial mackiatoah, or rather water Sroof, which acta aa a protection from re as well as water. In the ordinary way, if a shot pierced the aide of s battleship water won Id poor ia at the hole, and poaaihly the ship might sink, but thia ia obviated by providing a backing to tha armor. Great secrecy la kept in tha various aaviea regarding tha material need and ita arrangement. Ia many of tha lateet battleships, however, tha eoating ia made of cellulose, cellu-lose, which ia again obtained from the Sbroug eoeoaaut rind. Cellulose possesses pos-sesses tha peculiar property of swelling immediately it comes in contact with salt water. Therefore tha moment that water pours in at a hole in the ship's aide tha cellulose almoet inataataaeous-ly inataataaeous-ly expands and eloaea the aperture. Of course the celluloee ia especially treated in order to reader it fireproof. A man of war has ita vitality enormously enor-mously diminished if certain portions af it become too eold, ia much tea same way as its human tenants. Accordingly, According-ly, ita boiler and ateam pipes are elethed with ".jackets." In noma eases the jackets are made of erdinary blanketing, blan-keting, ia otbere of a gbroua elavlike composition, or even of close grained wood. In general, the material used for a ship's underclothing af this description de-scription consists of miaerel wool. However, How-ever, tha great ship ta more likely to suffer from the effects of heat than from these of cold. There ia always the danger, dan-ger, owing to the newer type of machinery ma-chinery employed, that the powder magazines reav get too hot. In the lateat mea of war the stores ara surrounded bv a thick coating of mineral, wool. Mineral wool, by the way, haa nothing whatever to do with wool, as it consists of a mass of anowv threads of a kind af glass. It ia made bv throwing jete of high pressure steam through tea et reams of liquid slag which flow from tha furnarea ia the manufacture of iron nod steel. Enormous quaatitiee of this strange variety af wool are used on bosrd for the purpoee of underclothing the bulk-' heads and the more delicate portions of the ship's body. This invaluable sub staica acta equally well aa a protector from heat aad from cold. It ia such a remarkable noa conductor of heat that it ia aaed for covering the refrigerators and the cold storage eaambere,- and therefore the explosive store. In the dockyards all men who arc employed in packing the mineral wool ia the spaces in the snipe ara obliged to wear masks. This is to prevent the eherp. needlelike |