[837]. Double riveted lap joint.

[838]. Single riveted butt joint.

[839]. Double butt joint.

[840]. T-iron butt joint.

[841], [842], [843], & [844]. Angle or edge seams.

[845]. Transverse tubular seam.

[846], [847], & [848]. Reducing ring seams.

[849], [850], [851], & [852]. Bottom seams round water spaces, fire-boxes, &c.

[853]. Expansion hoop joint in boiler flues, &c.

[854] & [855]. Fire-box stays.