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

WORKING OF A DISTILLING APPARATUS. 163 will thus adjust itself so as to be in due proportion to the fresh water. If a filter is part of the apparatus, the fresh water will pass through the filter on its way to the feed regulator. Fourthly.—The pumps will now draw away the fresh water and the regulated feed water, delivering the former to where desired, and the latter to the evaporator casing. Trial Sheet. 5. A Form for entering the usual particulars required by Government is given below. For Government trials it is necessary to provide proper measuring tanks, in order to show the quantity of gained water produced, the weight of primary steam used, and the brine discharged, in com- pliance with the specification. All materials have first to be tested to the satisfaction of the inspector or over- seer, and all parts of the apparatus have to be proved and passed in compliance with the terms of the specifica- tion. No distinction is made with regard to the long standing of any makers. All are treated in the same manner. 6. In the case of private contracts—that is, with regard to distilling apparatus supplied to private firms—the in- spection is not nearly so strict, satisfaction being felt by specifying that the makers are to supply the distilling apparatus so as to meet the Board of Trade requirements, and the trial of the apparatus is more or less formal, according to the confidence in the makers that are sup- plying the distilling apparatus. Note.—Official trials are usually conducted under the following conditions :— (1) Primary Steam Pressure—25 lbs. per square inch