Lovers of good coffee want it served hot, but boiling spoils coffee. The modern electric percolator, which can be operated on the dining table, has solved coffee-making problems. The particular style of percolator shown in [Fig. 9] has no valves or floats or traps that continually get out of order and that make the cleaning of a percolator so disagreeable. This valveless percolator is very easily cleaned and requires no brush. The heating element of this type percolator is in the bottom of the pot in the center of the water space, and is of the immersion type, protruding up from the center of the bottom of the pot. The heating element is made of flat ribbon resistance wire wound on mica, then bent into the form of a cylinder to fit into the German silver shell. A screw-operated spreader in the center presses the heating element tightly against the entire surface of the shell and insures rapid conduction of the heat from the element to the water. A study of the illustration showing the inside of the percolator ([Fig. 10]) will make clear to you the method of operation. With this style of electric percolator, percolation begins within thirty seconds after the water has been placed in the pot and the current turned on, and delicious coffee, clear as amber, is ready to pour in ten minutes.
Fig 10.—X-Ray Showing the Valveless Mechanism, Electric Percolator
The above gives a comprehensive insight into the general construction, equipment and operation of valveless Percolators. 1—Glass globe. 2—Aluminum coffee basket. 3—Element, with German-silvershell—completely surrounded by water. (Highly efficient.) 4—Interchangeable switch-plug. 5—Ebonized wood—always-cool handle. 6—Copper body—nickeled and highly polished. 7—White metal spout. 8—Lid—securely fastened hinge.
Percolators of this type are made by the manufacturer from sheet copper spun in perfect shape, and also aluminum spun. The latter makes an especially desirable percolator.
Fig. 11.—Electric Machine Type Valveless Percolator