A Practical Manual On Sea Water Distillation
With A Description Of The Necessary Machinery For The Process

222 SEA WATER DISTILLATION. The fresh water produced rises from a pipe at the base of the distilling condenser, and is conducted into the filter in very much the same way as indicated in (N) in Fig. 20. The pressure gauges on first and second evaporators are the same as (A) and (B) in Fig. 20, whilst the first evap- orator has two gauges, one for the coil pressure and the other for the pressure in the casing. Note.—By using Col. 2 as suggested, a record of every 15 minutes is obtained, thus testing the steady working of the apparatus. Form of Trial Sheet. 114. The foregoing form for recording the results of the trial of multiple distilling machinery will indicate the various points of importance. The following rules must be observed, otherwise the trial is more or less valueless. RULES (for Trial Workings). (1) All measuring appliances, such as tanks, steam gauges, thermometers, salinometers, &c., should be accurate, and of approved make. (2) The record of the trial should commence from the time when the apparatus is in full operation. In a specially strict trial, the fires should then be drawn and re-lighted with weighed fuel (coal, &c., including the firewood, also cinders drawn out). This involves hardly a momentary fall in the production, but it is necessary, to avoid dispute as to the condition of the fire when finishing, as compared with what it was when starting the trial. (3) When concluding the trial, the following state of things should be the same as when the trial commenced