368

MODERN PAPER-MAKING

SUBSTANCE EQUIVALENTS: GRAMMES AND POUNDS.

Grammes per Square Mette
i Demy (22|XI?J)
Royal (25x20)
Double Foolscap
(27 x 17)
Double Crown (30X20)

48o's 16.
50o's Lb.
Si6's Lb.
48o's Lb.
50o's Lb.
5i6's Lb.
48o's Lb.
50o's Lb.
516'$ Lb.
4So's Lb.
500*5 Lb.
5i6's Lb.

20 ..
5-38
5-6
5.78
6.82
7.1
7-33
6.26
6.52
6-73
8.19
8.53
8.8

21 ..
5.64
5.88
6.06
7.16
7.46
7-7
6-57
6.84
7.06
8.6
8.96
9.24

22 ..
5-91
6.16
6.35
7-5
7.81
8.06
6.89
7.17
74
9.01
9-39
9.68

23 ..
6.18
6.44
6.64
7.84
8.16
8.43
7-2
7.5
7-74
9.42
9.81
10.13

24 ..
6.45
6-73
6-93
8.18
8.52
8-79
7-51
7.82
8.07
9-83
10.24
10.57

25..
6.72
7.0
7.22
8.52
8.87
9.16
782
8.15
8.41
10.24
10.67
11.01

26 ..
6.99
7,28
75i
8.87
9-23
9-53
8.14
8.48
8-75
10.65
11.09
11.45

27 ..
7.26
7.56
7.8
9.21
9-59
9.9
8-45
8.8
9.08
11.06
11.52
11.89

28 ..
7-53
7.84
8.09
9-55
9-95
10.27
8.76
9.12
9.42
11.47
n-95
12.23

29 ..
7-8
8.12
8.38
9.89
10.3
10.63
9.08
9-45
9.76
n.88
12.38
12.77

30..
806
8.4
8.66
10.23
1066
11.0
9.39
9.78
10.09
12.29
12.8
13.21

31 -•
8.33
8.68
8.95
10.57
II.OI
11.36
9-7
IO.I
10-43
12.7
13.23
13-65

32 ..
8.6
8.96
9.24
10.91
11.36
H.73
10.02
10.43
10.77
13-11
13.66
14.09

33 -•
8.87
9.24
9-53
11.25
11.71
12.09
10.33
10.76
II. I
13-52
14.08
14-53

34 •-
9.14
9.52
9.82
11.59
12.07
12.46
10.64
11.08
11.44
13-93
14-51
14-97

35 ..
9.41
9.8
10.11
11.93
12.43
12.83
10.95
11.41
11.77
14.34
14.93
15.42

36.. ..
9.68
10.08
10.41
12.28
12.79
13-2
11.27
11.74
I2.II
14.75
15.36
15.86

37 -
9-95
10.36
10.7
12.62
13-15
13-57
11.58
12.06
12.45
15.16
15-79
16.3

38.. ..
10.21
10.64
10.98
12.96
13-5
13-93
11.89
12.39
12.78
15-57
16.22
16.74

39 -.
10.48
10.92
11.27
13-3
13-85
14.29
12.21
12.72
13.12
15.98
16.64
17.18

40 ..
10.75
11.2
1156
1364
1421
14.66
12.52
13.04
13.46
16,38
17.06
17.61

41 ..
11.02
11.48
11.85
I3-9S
14.56
15.02
12.83
13.37
13.79
16.79
17-49
18.05

42 ..
II.2Q
11.76
12.14
H-32
14.91
15-39
13-15
13.7
14.13
17.2
17.92
18.49

43 ••
11.56
12.04
12.43
14.66
15.27
15.76
13.46
14.02
14.47
17.61
18.34
18.93

44 -.
11.83
12.32
12.72
15.0
15.62
16.12
13.77
14.34
14.8
18.02
18.77
19.37

45 ..
12.1
12.6
13.01
15.34
15.98
16.49
14.08
14.67
15.14
18.43
19.2
19.81

46..
12.36
12.88
13-29
15.69
16.34
16.86
144
15.0
15.48
18.84
19.62
20.25

47 -•
12.63
13.16
13-58
16.03
16.7
17.23
14.71
15.32
15.81
19.25
20.05
20.69

48 -.
12.9
13.44
13-87
i6-37
17.06
17.6
15.02
15.65
16.15
19.66
20.48
21.13

49 - -
13-17
13-72
14.16
16.71
1741
17.96
15-34
15.97
16.49
20.07
20.91
21-57

50 ..
13.44
14.0
14.45
17.05
17,76
18,33
15.65
16.3
16.82
20.48
21.33
22.02

60 ..
16.12
16.8
17-33
20.46
21.3
21.99
18.78
i9-5<5
20.18
24.58
25.6
26.42

70 ..
18.88
19.6
20.22
23.86
24.85
25.66
21.9
22.81
23.54
28.68
29.87
30.83

80 ..
21.5
22.4
23-11
27.27
28.4
29.32
25.03
26.0
26.91
32-77
34-13
35.23

90 ..
24.19
25.2
26.0
30.68
31.96
32.98
28.16
29.33
30.27
36.86
38-4
39-63

100
26.88
28.0
2,8.9
34-1
35.52
36.65
31.3
32.6
33-64
40.96
42.67
44-03

Rough Methods.—(i) Grammes per square metre multiplied by 0.41 = weight 20X 30 48o's. Example: 30X 0.41 = 12.30 Ib.
(2) Weight per ream 480*5X1464—area in inches gives grammes per square metre. Example: 15X 1464—25x20=44
grammes