[1069]. Patent lap-folded pipe.
[1070]. Long screw, coupling and back nut, for making the last joint in a series of pipes when the last piece cannot be screwed into both joints.
[1071] to [1073]. Screwed unions. The nut may be as [No. 1072] or [1073].
See also [Section 78].
[1074] & [1075]. Unions with right and left-hand threads.
[1076]. Expansion joint plain.
[1077]. Expansion joint with gland and safety bolt to prevent the joint blowing out.
A bent U-shaped tube of copper is sometimes used as an expansion piece in a line of hot piping.
[1078]. Royle’s patent diagonal universal joint, by swivelling the diagonal joint the pipes can be set at any angle from 0° to 90° to each other.
[1079]. Expanding pipes with stuffing boxes at each joint, used for conveying water, steam, or air to a movable engine or machine.