Gas and oil radiators would be more properly termed " convectors," since they warm mainly by convected currents.
To obtain a larger heating surface than a pipe affords, radiators are connected with the pipes where desired, and the water passing through them warms the surrounding air.
4) acts on precisely the same principle, but in place of two pipes being placed in adjacent positions one large main makes a complete circuit of the area to be warmed, starting from and returning to the boiler, and from this main flow and return branches are taken and connected with radiators and other heating appliances.
5) a rising main is taken directly from the boiler to the topmost floor of the building, and from this branches are dropped to the lower floors, and connected by means of smaller branches to radiators or coils.
Owing to the very rapid movement and the consequent increased rate of transmission of heat, the pipes and radiators may be reduced in size, in many circumstances a very desirable thing to achieve.
Branches are taken off the flow pipe, and after circulating through coils or radiators are connected with the return pipe.
Radiators are fed directly from the main.
A drawback to the use of steam is the fact that the high temperature of the pipes and radiators attracts and spreads a great deal of dust.
To regulate the heat it is necessary either to instal a number of small radiators or to divide the radiators into sections, each section controlled by distinct valves; steam may then be admitted to all the sections of the radiator or to any less number of sections as desired.
Radiators (really convectors) were in their primitive design coils of pipe, used to give a larger heating area than the single pipe would afford.
They are now usually of special design, and may be divided into three classes - indirect radiators, direct radiators and direct ventilating radiators.
Indirect radiators are placed beneath the floor of the apartment to be heated and give off heat through a grating.
Direct radiators are a development of the early coil of pipe; they are made in various types and designs and are usually of cast iron.
Ventilating radiators are similar, but have an inlet arrangement at the base to allow external air to pass over the heating surface before passing out through the perforations.
Radiators should not be fixed directly on to the main heating pipe, but always on branches of smaller diameter leading from the flow pipe to one end of the radiator and back to the main return pipe from the other end; they may then be easily controlled by a valve placed on the branch from the flow pipe.
The steam is employed for warming apartments by means of pipe radiators, for heating water by steam injections, and for all cooking purposes.
Electric-radiative circuits like thermal radiators are divided into two broad classes, good radiators and bad radiators.
The good electric radiators may be compared with good thermal radiators, such as a vessel coated with lamp black on the outside, and the bad electric radiators to poor thermal radiators, such as a silver vessel highly polished on its exterior.
When electric oscillations are set up in these two classes of electric radiators, the first class send out a highly damped wave train and the second a feeble damped wave train provided that they have sufficient capacity or energy storage and low resistance.
For purposes of theoretical discussions relating to moving radiators and reflectors, it is important to remember that the dynamics of all this theory of electrons involves the neglect of terms of the order (v/c) 2, not merely in the value of K but throughout.
The modification of the spectrum of a radiating gas by a magnetic field, such as would result from the hypothesis that the radiators are the system of revolving or oscillating electrons in the molecule, was detected by P. Zeeman in 1896, and worked up, in conjunction with H.
Castings which, like hydraulic press cylinders and steam radiators, must be dense and hence must have but little graphite lest their contents leak through their walls, should not have more than 1.75% of silicon and may have even as little as 1% if impenetrability is so important that softness and consequent ease of machining must be sacrificed to it.
The city lies in an agricultural and grape-growing; region, and has a fine harbour and an extensive lake trade; the: manufactures include locomotives, radiators, lumber, springs, shirts, axes, wagons, steel, silk gloves and concrete blocks.
Among the city's manufactures are steel, engines, locomotives, radiators, shovels, bricks, flour, furniture and leather.