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For the warming of a house the Romans not only portable braziers with charcoal for fuel, but in the larger establishments there existed a system of "central" heating, by which hot air was conducted from a furnace in the basement through flues running beneath the floor and up through the walls, where its effect might be regulated by adjustable openings or registers.
The Arizona Experiment Station tells how a very good sweet potato hot-bed at little cost is constructed as follows: A frame of rough boards seven feet wide, twenty feet long and fourteen inches deep is laid down over two flues made by digging two trenches one foot deep and about two feet wide, lengthwise of the bed.
"Heat was communicated to these flues by means of Praefurnia. In the middle of the northern wall of the second stove, the ruins of one of these furnaces appear. It consists of strong walls of about 16ft. square, with an opening in the centre of about 3ft. wide, which terminates conically in the north wall of the stove 2 ft. wide where part of the broken arch bears evident marks of fire.
The only part of the sighting that still wasn't explained was the radar pickup on the F-86's gun sight. Lieutenant Flues checked around, did a little experimenting, and found out that the small transmitter box on a radiosonde balloon will give an indication on the radar used in F-86 gun sights. To get a final bit of proof, Lieutenant Flues took the gun camera photos to the photo lab.
Now, do you not see that as soon as the sun has warmed the flues, there will be a stiff breeze blowing, not over the roof, but really between the roof and the house, and the hotter the sun the stiffer the breeze; in the words of one who has tried it, "a perfect hurricane."
A huge square edifice; windows very high from the ground, not very large, square tops, frame and sash painted white; expressionless roof; flat, helpless chimneys perched upon the outer walls, the course of their flues showing in a crooked stain; at the back side a most humiliated-looking wooden attachment, somewhat unhinged as to its doors and out at the elbows as to its windows, evidently hiding behind the pile of brick and mortar that tries to look dignified and grand, but only succeeds in making a great red blot on the landscape; all the while you know the only homelike portion of the establishment is in the wooden rear part.
It is a mountain-range of roofs, with ridges crossing, interlacing, and piled on one another, and upon which tall chimneys raise their peaks. It was but yesterday that they had an Alpine aspect to me, and I waited for the first snowstorm to see glaciers among them; to-day, I only see tiles and stone flues.
The smoke from the furnace, carried through flues to the smoking-room, was there received and stored in the reservoirs, with each of which was connected one dozen rubber tubes, having at their ends amber mouth-pieces. Upon each of these mouth-pieces was arranged a small meter registering the amount of smoke consumed through it, and for this the consumer paid so much a foot.
The reason for having a number of stoves at intervals is that the heat in a flue will not carry, for any useful purpose, more than about 8 ft. or 10 ft., and a single stove would give an irregular temperature in any except a very small room. If all are not used at once, the flues of those not in use may be closed by a damper to prevent down draught.
Most of us were putting in fourteen hours a day, six days a week. It wasn't at all uncommon for Lieutenant Andy Flues, Bob Olsson, or Kerry Rothstien, my investigators, to get their sleep on an airliner going out or coming back from an investigation. TWA airliners out of Dayton were more like home than home. But we hadn't seen anything yet.
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