Measures 56 by 28 inches, and is ruled by the wight per sheet The numbers run from 8 to 18 Russi in lbs per sheet 8 Russian pounds equal 7.2 English pounds; 9 = 8.1 lbs.; 19= 9 1bs.; 11=10 lbs.; 12 = 11.2 lbs. etc. 100 Russian lbs . equal 80 lbs. English.

Thickness in parts of an inch.

Iron.

Copper.

Brass.

Lead.

1/16

25

29

27

3.7

1/8

50

5.8

5.5

7.4

3/16

75

87

82

11 1

¼

100

116

10.9

148

5/16

125

145

13 6

185

3/8

15 0

174

10 8

22.2

Thickness in parts of an inch.

Iron.

Copper.

Brass.

Lead.

7/16

17 5

908

190

25 9

½

200

23.2

21.8

29.6

5/8

25.0

28.9

27 1

37.0

¾

30.0

34.7

325

44 4

7/8

86.0

40.4

37 9

57.8

1

40 0

46 2

43 3

69.2