ABSTRACT

Helmets, 217, 221 Hemispherical dome, 478 Herringbone strutting, 572 High performance window, 342 Highway dumpers, 160 Hinge or pin joints, 417 Hip tiles, 437, 441 Hoardings, 83-7 Hoists, 162-3 Holding down bolts, 393, 407 Hollow box floor units, 584 Hollow pot floor, 582-3 Hollow sections, 403 Horizontal shore, 139-41 Horizontal sliding sash window, 347 Hot water: cylinders, 669 direct system, 664 expansion vessel, 666 heating systems, 677-80 indirect system, 665 mains fed, 666