stood by the learner, as it differs nothing from that employed for a Brewer's Copper, except in its being confined to gallons.

It is now proper to mention that the gage of the Wash is taken through a cylindrical tube in the breast of the Still, which tube rises some inches above the level of the base of the collar, where the Table begins: consequently, instead of commencing at FULL as in the Table, we must begin as many inches higher as the tube rises above the level of the top of the frustum. Conceive, for example, that the tube is elevated 3 inches above the surface of the globular part of the Still, and the Table must begin as follows:

In copying any Table into the Table Book, we omit all decimals of a gallon, as has been mentioned in treating of the Utensils of Common Brewers; to com

A A

pensate, however, for this omission, any decimal greater than five-tenths is considered a gallon, as will appear on examining the above portion of a Table Book for the Still before us.

By what has been said and done it must seem no very difficult task to gage and inch a Still; but there. are in the way impediments to which we have not yet alluded: for from the gross content of the Still, and from the several areas which they affect, we have to deduct for various incumbrances, such as cross-bars, spindles, braces, hooks, chains, &c. which are within the Still, and employed for rousing the Wash; because without this precaution, a sediment would be deposited at the bottom, and impart to the spirit a burnt, or otherwise disagreeable flavour. As no certain rule can be given for the different cases that will occur, we can only refer the practitioner to the THIRD SECTION OF MENSURATION, where he will find every sort of Solid, likely to be met with, in the course of his practice, treated at length both by Pen and Rule.

If he understands this fundamental part thoroughly, he will never be at a loss, whilst on the contrary if he is ill-versed in this, doubt and error will ever be his companions.

When a body, such as a hook or chain, is of so irregular a form, that none of the Problems in the Mensuration will apply to it, then the best practical mode of determining the content is to drop it into

some vessel containing water, carefully observing the number of gallons it displaces.

We shall now exhibit the form of a Dimension Book, with deductions for incumbrances, supposed to be existing, and accurately measured.

DIMENSION BOOK.

A. B.'s Wash Still, No. 2, Gaged, 10 May, 1820.

Depth Cross Diameters

21

Part.

21.02

681-01

S 39.8.. 40-225 40·02 Glob.
2130-1..129.95130·05

10 134.6..134.8 134.7 61.69 10 0361.66 616.60 139.8 66.45 10 0266-43 664-30 4 02 72.85 291-40

10 140-0..139.6

10 146-2..146.6

10 152.8..152.4
10 158-0..157.8

146.4 72.87 2684 72-03 432-18

152.6 79.17 10 0379-14 791-40 157.9 84.77 10 0384-74 847-40

10 154.4..154.2 154.3 80.95

30980.86 242.58 070580-90 566.30

10 148.2..148.0 148.1 74.57 10 0274·55 745.50 10 140-4..141.0 140.7 67.30 10 0267-28 672-80

10 132.0..131.6

114 Whole Depth.

131.8 59-06 S50459 02 295.10 2500 59.06 295-30

Crown by Measure.

Whole Content of the Still in Wine Gallons.

540.00

7681-87

In the example above, it will be perceived that every part of the depth of the Still, except the 5 inches nearest the crown, is more or less affected with incumbrances, for which an allowance has been made. The nett area having been thus obtained, the con

struction of a Table, for the Still before us, will be in principle the same as for the first Still.

Since, by Act of Parliament, Distillers are not at liberty to draw off any low wines before they have charged their Wash Stills with wash or wort, paying duty on three fourths of the whole content of each Still and Head; and besides, as the annual licences of Distillers as well as of Rectifiers, are regulated by these contents, it will be requisite in the next Problem to treat of the Head of a Still.

PROBLEM II.

To Gage a Still-Head.

The cylindrical portion of the head which is received into the collar of the Still, is always considered as part of the head, but the neck forms no part.

Hence the divisions in general to be made of a StillHead are the four following:

First.........The cylindrical portion,

Second...... The spherical frustum next the cylinder, Third........The middle portion,

Fourth...... The spherical frustum next the neck.

The middle portion of a Still-Head may, for the most part, be regarded as the middle frustum of a

spheroid, but the shapes of Still-Heads are so various, that the practitioner must be guided by his own judgment, founded on a correct knowledge of the Problems treated of in MENSURATION. In short, the Head must

be divided into such figures as can be gaged by the problems here alluded to.

EXAMPLE.

Let the following diagram represent the Head of the first Still in PROBLEM I., given to be gaged.

Divide the Head into four portions, namely, nmei, mrsn, rCDs, and CBD; the first portion being the frustum of a sphere; the second, the middle frustum of an oblate spheroid; the third, the frustum of a sphere; and the fourth, a cylinder.