Show liquid air bottle liquid air Is an article of commerce in berlin it Is sold in packages like this each of which holds about two quarts and costs 73 75 cents that Is to say the liquid air does for packages which are returnable are much more r diable the glass flask Is silver plated and s double walls the spice between ah alch ch Is a vacuum the object of th thid Is to prevent heat penetrating to tho the contents conteh ts the flask is stopped with a plug of some porous substance and packed with similar material in a wire cage if corked tightly it would explode |