MAKING THISTLE FUNNELS, U-TUBES, ETC.--COMBINING THE PARTS
OF COMPLICATED APPARATUS--MERCURY, AND OTHER AIR-TIGHT
JOINTS--VACUUM TAPS--SAFETY TAPS--AIR-TRAPS.
Electrodes--U-Tubes--Spiral Tubes--Thistle Funnels--Closing
Tubes containing Chemicals--Construction of Apparatus
Consisting of Several Parts--Modes of Combining the Parts of
Heavy Apparatus--Mercury Joints--Vacuum Taps--Lubricating
Taps--Air-Traps, 55-69