Show Thermo Thermos Bottle BottI A vacuum flask Is III u II gla glass I wall walls the between with double space which h Is evacuate l. I Th The It Hy emir Junc Juar Junction tion o of the the alls walls Is III at the tile net neck of If tIll e vessel el It l Iii is also Known a as tin the war Clr Ir Ir Tarn tames vessel tessel after Its Inventor Dewar Thermos Haste flask 1 is 1 u It I pro pro- ri name Dame applied to a form protected protected pro pro- by metal casing The mate male vacuum between glass walls Is of ot heat practically a a non conductor and radiation Is la reduced to a minimum by silvering the glass Where flask k Is le subject to rough usage metal has been substituted for glass but the latter ii the more |