( 240 )

the difference between the bung and head di-ameters, expressed in inches and decimals, andadding it to the latter, which gives the meandiameter, or that of a cylinder of equal altitudeand content. (Dr. Mackay, from whose workthis table is taken, gives four tables to be usedaccording to the degree of convexity, or swel-ling, of the staves; but, for the present purpose,one is sufficient.) Then, to double the logarithmof the corrected mean diameter, expressed ininches, add the logarithm of the length, andthe number 7‘44491, if for ale gallons, or 7’53165if for wine, reject 10 from the index, and thenumber answering is the content in gallons.*

Inches.

•o

1

'2

•3

•4

•5

■6

•7

•8

•9

i

0-55

0-60

0-66

0-71

0-77

0-82

0-88

0-93

0-99

1-04

2

M0

1-15

1-21

1-26

1-32

1*37

1-43

1-48

1-54

1-59

3

1-G5

1-70

1-76

1-81

1-87

1-92

1-98

2-03

2-09

2-14

4

2-20

2-25

2-31

2-36

2-42

2-48

2-53

2-59

2-64

2*70

5

2-76

2-81

2-87

2-92

2-98

3-04

309

315

3-20

3-2G

6

3-32

3-37

3-43

3-48

3-54

3-G0

3’65

3-71

3-76

3-82

7

3-88

3-93

3-99

4-04

4-10

4-16

4-21

4-27

4-32

4-38

8

4-44

4-50

4-55

4-61

4-66

4-72

4-78

4-84

4-89

4-95

D

5-01

5-07

5-12

5-18

5-24

5-30

5-3G

5-41

5-47

5-53

10

5-59

5-65

5-70

5-76

5-82

5-88

5-94

5-99

6-05

6-11

* This, in fact, is multiplying the square of the correctedmean diameter by '7854, for the area of the mean section, thisby the length, and dividing by the number of cubic inches ina gallon.