Show Gasp lpes made of paper it Is bald that paper can be used tor making gasp lpes and tv o processes are now in use in the first the pula Is run into a mold through which runs a mandril it Is then compressed dried and varnished the tubes thua produced are rigid and little liable to breakage they last well and are capable of rendering a good service in the second process sheets of ma alla paper are cut to a breadth equal to the desired length of the tube and then passed into a bath 0 cementing material asphalt in a state ol 01 fusion from this when half cold they are rolled tightly and uniformly round an iron bar which forms the core successive sheets are added until the desired thickness has been attained the tube thus formed Is subjected to pressure in a special machine and covered with alno sand which adheres to the asphalt the la plunged into water to finish the cooling and exterior and interior are finally rendered impermeable by a material with silicate of aa a basis christian science monitor |