The injury which initiates them may be very slight in the first placea mere abrasion, puncture or Fungus infectionbut the minute wound or other disturbance, instead of healing over normally, is frequently maintained as a perennial source of irritation, and the regenerative tissues grow on month after month or year after year, resulting in extraordinary outgrowths often of large size and remarkable shape.
All these institutions are performing a great regenerative work, and the tribulations and disappointments of the last decades of the 19th century were not all loss.
15) employed for melting glass are usually heated with gas on the " Siemens," or some similar system of regenerative heating.
These small furnaces are frequently arranged for direct coal firing, but regenerative gasfired furnaces are also employed.
The fusion of sheet-glass is now generally carried out in gas-fired regenerative tank furnaces.
With producer gas it is necessary to pre-heat both the gas and the air which is supplied for its combustion by passing both through heated regenerators (for an account of the principles of the regenerative furnace see article Furnace).
(b) Both the producer gas and the air are heated before they enter the combustion chamber, as in the Siemens system of regenerative firing.
The entire absence of any trace of a distinct alimentary tract, the loss of true regenerative power, the peculiar gametic segmentation of the body into hundreds of "proglottides" budded off from n, (From Cambridge Natural History, vol.
Knowing this, and having in the Siemens regenerative gas furnace an independent means of generating this temperature, the Martin brothers of Sireuil in France in 1864 developed the open-hearth process of making steel of any desired carbon-content by melting together in this furnace cast and wrought iron.
In their place the regenerative stoves of the Whitwell and Cowper types (figs.
The general plan of the open-hearth process was certainly conceived by Josiah Marshall Heath in 1845, if not indeed by Reaumur in 1722, but for lack of a furnace in which a high enough temperature could be generated it could not be carried out until the development of the Siemens regenerative gas furnace about 1860.
These regenerators are the essence of the Siemens or " regenerative furnace "; they are heat-traps, catching and storing by their -11, Ton Traver 7s 20 Tan Tra y.
This defect is usually remedied by heating the pits by the Siemens regenerative system (see § 99); the greater FIG.
In the intermittent system the waste heat can, it is true, be utilized either for raising steam (but inefficiently and inconveniently, because of the intermittency), or by a regenerative method like the Siemens, Fig.
This regenerative heating is similar in principle and effect to that obtained by means of the shaft and ring kilns described above.
Stirling is of special interest as embodying the earliest application of what is known as the "regenerative" principle, the principle namely that heat may be deposited by a substance at one stage of its action and taken up again at another stage with but little loss, and with a great resulting change in the substance's temperature at each of the two stages in the operation.
Heated by gas, with regenerative checker work at each end, and fed with ore or concentrates, red-hot from the calciners, through a line of hoppers suspended above the roof.