Full resolution (JPEG) - On this page / på denna sida - Pages ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
PHIPPS’S JOURNAL. 589
verted into vapour, make way for a fucceflion of frefh fheets; and thus both by the
evaporation and clofe contact of the cold water conftantly repeated, the heat is carried
off more effectually than by any other method yet known.
«4. The carrying on the diftillation without any addition, a correct chemical
analyfis of fea water having evinced the futility of mixing ingredients with it, either to
prevent an acid from rifing with the vapour, or to deftroy any bituminous oil fuppofed
to exift in fea water, and to contaminate the diftilled water, giving it that fiery unpala-
table tafte infeparable from the former proceffes.
** 5. The afcertaining the proper quantity of fea water that ought to be diftilled,
whereby the frefh water is prevented from contracting a noxious impregnation of me-
tallic falts, and the veffel from being corroded and otherwife damaged by the falts
caking on the bottom of it.
© 6. The producing a quantity of {weet and wholefome water, perfectly agreeable
to the tafte, and fufficient for all the purpofes of fhipping.
«< 7. The taking advantage of the drefling the fhip’s provifions, fo as to diftil a very
confiderable quantity of water from the vapour which would otherwife be loft, without
any addition of fuel.
*¢ To fum up the merits of this method in a few words :
“* The ufe of a fimple tube, of the moft eafy conftruction, applicable to any fhip’s
kettle. The rejecting all ingredients ; afcertaining the proportion of water to be dif
tilled, with every advantage of quality, faving of fuel, and prefervation of boilers. The
obtaining frefh water, wholefome, palatable, and in fufficient quantities. Taking the
advantage of the vapour which afcends in the kettle, while the fhip’s provifions are
boiling.
e All thefe advantages are obtained by the abovementioned fimple addition to the
common fhip’s kettles, But Doctor Irving propofes to introduce two further im-
provements.
‘* The firft is a hearth, or ftove, fo conftruéted, that the fire which is kept up the
whole day for the common bufinefs of the fhip, ferves likewife for diftillation ; whereby
a fufficient quantity of water for all the ceconomical purpofes of the fhip may be ob-
tained, with a very inconfiderable addition to the expence of fuel.
‘« ‘The other improvement is that of fubftituting, even in the largeft fhips, caft-iron
boilers, of a new conftruction, in the place of coppers.”
Directions for diftilling Sea-Water.
‘¢ As foon as fea-water is put into the boiler, the tube is to be fitted either into the
top or lid, round which, if neceflary, a bit of wet linen may be applied, to make it fit
clofe to the mouth of the veffel ; there will be no occafion for luting, as the tube atts
like a funnel in carrying off the vapour.
** When the water begins to boil, the vapour fhould be allowed to pafs freely for a
minute, which will effe€tually clean the tube and upper part of the boiler. ‘The tube
is afterwards to be kept conitantly wet, by pafling a mop or {wab, dipped in fea-water,
along its upper furface. The wafte water running from the mop, may be carried
off by means of a board made like a fpout, and placed beneath the tube.
“ The diftillation may be continued till three fourths of the water be drawn off, and
no further. This may be afcertained either by a gauge-rod put into the boiler, or by
meafuring the water diftilled. The brine is then to be let out.
‘* Water may be diftilled in the fame manner while the provifions are boiling.
“¢ When
<< prev. page << föreg. sida << >> nästa sida >> next page >>
