The secret corrosions of the ship-worm will sink a fleet.

decay, dilapidation, ravages of time, wear and tear; corrosion, erosion; moldiness, rottenness; moth and rust, dry rot, blight, marasmus^, atrophy, collapse; disorganization; delabrement &c (destruction).

On the part of the latter, there might be some corrosions of jealousy.

Incrustation and Corrosion of Boilers.

upon the square inch of sectional area of metal, especially if it is liable to be weakened by corrosion.

per square inch of section, as the strength of internal stays in boilers is generally soon diminished by corrosion.

Indeed, a strain at all approaching that upon locomotive boilers would be very unsafe in the case of marine boilers, on account of the corrosion, both internal and external, to which marine boilers are subject.

All boilers should be proved, when new, to twice or three times the pressure they are intended to bear, and they should be proved occasionally by the hand pump when in use, to detect any weakness which corrosion may have occasioned.

If the safety valve of a boiler be accidentally jammed, or if the plates or stays be much worn by corrosion, while a high pressure of steam is nevertheless maintained, the boiler necessarily bursts; and if, from an insufficiency of water in the boiler, or from any other cause, the flues become highly heated, they may be forced down by the pressure of the steam, and a partial explosion may be the result.

INCRUSTATION AND CORROSION OF BOILERS.

Q.What is the cause of the rapid corrosion of marine boilers?

Q.Are not marine boilers subject to internal corrosion? A.Yes; the greatest part of the corrosion of a boiler takes place in the inside of the steam chest, and the origin of this corrosion is one of the obscurest subjects in the whole range of engineering.

Q.Are not marine boilers subject to internal corrosion? A.Yes; the greatest part of the corrosion of a boiler takes place in the inside of the steam chest, and the origin of this corrosion is one of the obscurest subjects in the whole range of engineering.

Q.Are not marine boilers subject to internal corrosion? A.Yes; the greatest part of the corrosion of a boiler takes place in the inside of the steam chest, and the origin of this corrosion is one of the obscurest subjects in the whole range of engineering.

The thin film of scale spread over the parts of a marine boiler situated beneath the water, effectually protect them from corrosion; and when the other parts are completely worn out the flues generally remain so perfect, that the hammer marks upon them are as conspicuous as at their first formation.

Q.Can you suggest no reason for the rapid internal corrosion of marine boilers?

The circumstance of the chimney flue passing through the steam will manifestly surcharge the steam with heat, so that all the circumstances which are found to accelerate corrosion, are it appears such as would also induce the formation of surcharged steam.

If the valves be lifted up, and be suffered to remain up, as is the usual practice, they will become fixed by corrosion in that position, and it will be impossible after some time to shut them on an emergency.

The water discharged from them, too, from the want of a proper conduit, disfigures the front of the boiler, and adds to the corrosion in the ash pits.

The strength of the holding down bolts may easily be computed, when the elevating force of the piston or main centre is known; but it is expedient very much to exceed this strength in practice, on account of the elasticity of the keelsons, the liability to corrosion, and other causes.

He that willingly suffers the corrosions of inveterate hatred, and gives up his days and nights to the gloom of malice, and perturbations of stratagem, cannot surely be said to consult his ease.

E.C. BENEDICT '21 I've a monument reared more enduring than brass, Which is higher than pyramids built by the kings, Through the rains and the tempests, unharmed, it shall pass, And the wear the corrosion of centuries brings.

R120038, 2Nov53, Haldeman-Julius Publications (PWH) SPELLER, FRANK N. Corrosion: causes and prevention.

The Corrosion handbook.

The Corrosion handbook.