Over these holes are strips of mosquito gauze, as flame and dust arresters (see note below).   anvd [Please select]

Internal Seals, Air-Traps, Spray Arresters, Filter-Pumps--Sprays, Condensers; plain, double surface, and spherical--Soxhlet Tubes and Fat Extraction Apparatus--Vacuum Tubes, Electrode Work, Enclosed Thermometers, Alarm Thermometers.   anvd [Please select]

CHAPTER III Internal Seals, Air-Traps, Spray Arresters, Filter-Pumps--Sprays, Condensers; Plain, Double Surface, and Spherical--Soxhlet Tubes and Fat Extraction Apparatus--Vacuum Tubes, Electrode Work, Enclosed Thermometers, Alarm Thermometers, Recording Thermometers, "Spinning" Glass.   anvd [Please select]