THE

MECHANICS' MAGAZINE,

MUSEUM,

Register, Journal,

AND

GAZETTE,

APRIL 6th,--SEPTEMBER 28th, 1839.

VOL. XXXI.

"Science is progressing; human enjoyment moves with it, and is determined.
by it. It is delightful to track it, even though we cannot perceive how we are
immediately concerned therewith."

CENTRAL SOCIETY OF EDUCATION.

LONDON:

PUBLISHED FOR THE PROPRIETOR BY W. A. ROBERTSON,
MECHANICS' MAGAZINE OFFICE, FLEET-STREET.

1839.

No. 817.]

SATURDAY, APRIL 6, 1839.
Printed and Published for the Proprietor, by W. A. Robertson, No. 6, Peterborongh-court, Fleet-street.

[Price 3d.

HEARN

AND

BOILERS FOR THE GENERATION OF

2
REARN AND DAVIES'S IMPROVED BOILERS FOR

with water or other fluids, but in this
DAVIES's
IMPROVED improvement they are so arranged, that

it is impossible but that they must be STEAM AND HEATING OF WATER.

regularly supplied with water, unless the Sir,- Before describing the figures boiler be allowed to become dry, which, annexed, it will be useful to enumerate of course, can never be the case, except the several advantages stated by the pa- from the grossest neglect on the part of tentees to be derivable by the adoption the engineman. We have had (say the of these improvements.

patentees) almost daily experience for 1st. That the great inconvenience and many years, and are well acquainted with loss of time at present existing in “getting the action of fire on the surface of pipes up” of the steam in large manufactories,

when filled with fluid passing through steam-boats, &c. will be prevented, as in them, and have seen tubes after they five minutes after the fire is properly have been in daily operation for three lighted, steam begins to generate. years under a very great pressure and

2nd, From the decreased consumption heat, and yet they are this moment as of fuel, less stowage room will be re- sound as if they had never been used. quired in steain.boats.

9th, In the case of heating water for 3rd, Froin the rapid generation of buildings, soap, oils, sugar, &c., the steam, a very high power may be kept boiler will be required to be kept full, or up ior a long time, without the use of above the tubes, so that the circulation much extra fuel.

may be kept steadily in action. 4th, That in boilers which are now in Description of the Engravings. — general use, when the patent tubes are Figure 1, side view of boiler. Figure 2, applied, there will be saved one-third of front view of boiler. Figure 3, end the time in consequence of the quicker view of waggon tilt steam-boiler havgeneration of steam, and also one-third ing the improved apparatus attached of the boiler-room or more, and there- to it. These figures are on the front fore a less quantity of water will be re- page). A is a metal box, rivetted to the quired, and also fuel, and at the same front of the boiler and opening into it; time the steam be rendered purer. B B are metal pipes or tubes with flanges

5th, This invention will prevent boil- at their ends, secured to the box by ers from exploding by reason of the screws, rivets, or otherwise. These water being constantly in quick circula- pipes or tubes descend from below the tion, so that the sides of the boiler can level of the water in the boiler, and never become overheated, nor charged pass underneath it through the fire, with gases, which is frequently the case and ascend and enter the back end of when the iron becomes red-hot, and the boiler above the level of the water which causes the explosion.

contained within it, where they are 6th, It will be at once perceived from likewise secured by screw or rivets. reference to the engravings, that this ap- By this means a rapid circulation of paratus may be attached to all kinds of the water is produced as it is heated boilers; and that there will be no diffi- in passing through the fire, it enculty in making good any damage that tering at the lower end of the pipes, and may by any possibility occur, on sea or passing off heated into the boiler at their land.

upper ends, and at the same time giving 7th, That the fire will be found to off steam generated thereby. C, in fig. burn more freely by means of the draft 1, is a metal plate pierced with holes caused by the pipes being placed at some which is secured at both ends to the distance below the boiler, and in the flue, boiler, and is placed in a diagonal direcand at the same time no inconvenience tion opposite to the upper ends of the will arise to the engineman, either in pipes or tubes B B; its use is to cause stoking or supplying the fuel.

the water which comes over with the 8th, This apparatus is applicable for steam to be separated from it, and to be boiling sugar, oil, soap, and other fluids. thrown downwards into the water again, Many practical men are of opinion that whence the steam thereby is rendered pipes when placed in contact with the pure. Fig. 4, shows the bottom of the fire will burn out or consume; this is boiler, and the pipes or tubes B B, passing true if they are not regularly supplied beneath it.

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