(a) Diameter of rivet in inches: Multiply the thickness of plate in inches by 2 for plates up to 3/8 of an inch thick, by 1.5 for plates Iron of an inch thick, by 1.25 for plates from 5/8 to 3/4 of an inch thick, and by 1.125 for plates from , to 1 inch thick.

(b) Length of rivet under the head, in inches: Multiply the thickness of the plate in inches by 1 5.

(c) Distance between rivets, from centre to centre, in inches: (1) single- riveted joints: Multiply the thickness of plate in inches by 6 for plates up to 1/4 of an inch thick, by 5 for plates from 1/4 to3/8 of an inch thick, by 4 for plates from 3/8 to 5/8 of an inch thick, and by 3 for plates from 5/8 to 1 inch thick.

(2) Each line of rivets, double- riveted joints: Multiply the thickness of the plate in inches by 7 for plates up to 1/4 of an inch thick, by 6 for plates from 1/4 to 7/16 of an inch thick, by 5 for plates from 7/16 to 9/16 of an inch thick, and by 4 for plates from 9/16 to 1 inch thick.

(d) Lap to be given to joint, in inches: (1) Single-riveted joints: Multiply the thickness of plates in inches by 6 for plates up to 3/8 of an inch thick, by 4.5 for plates from 3/8 to 3/4 of an inch thick, and by 4 for plates from 3/4 to 1 inch thick.

(2) Double-riveted joints: Multiply the thickness of plate in inches by 10 for joints up to 3/8 of an inch thick, by 7.5 for joints from 3/8 to 3/4 of an inch thick, and by 6.7 for joints from 3/4 to 1 inch thick.

A table is appended, giving the thickness of plate in decimals of an inch, varying by sixteenths:

Halves.

Fourths.

Eighths.

Sixteenths.

Decimals.

1..........

0.0625

1.........

2..........

0.125

3..........

0.1875

1.........

2.........

4 .........

0.25

5..........

0.3125

3.........

6..........

0.375

7..........

0.4375

1..........

2.........

4.........

8..........

0.5

9..........

0.5625

10..........

0.625

11..........

0.6875

3.......

6........

12......:...

0.75

13..........

0.8125

7.........

14.........

0.875

15..........

0.9375

2..........

4.........

8.........

16.........

1.

The following example will serve to illustrate the rules: What should be the proportions of a single-riveted joint for a boiler made of plates 1/8 of an inch thick?

Diameter of rivets is twice 0.125, or 1/4 of an inch. Length of rivets under head is 4.5 times 0.125, or 9/16 of an inch. Distance between centres of rivets is 6 times 0.125, or 3/4 of an inch. Lap of joint is 6 times 0.125, or 3/4 of an inch. B.