Branches may be made from the main pipes by means of smaller pipes arranged in the same manner as the mains, the Bolter branch flow pipe being connected with the main flow pipe and returning into the main return.
The mains, the largest of which are 4 in.
The steam mains to the houses are laid by the supply company; the internal pipes and fittings are paid for or rented by the occupier, costing for an installation from £30 for an ordinary eight-roomed house to £Ioo or more for larger buildings.
In first cost the hydraulic crane has the advantage, but the power mains are much less expensive and more convenient to arrange in the electric crane.
" Abuserois-je de la liberte de conjectures si je disois, que les Plantes et les Animaux qui existentujourd'hui sont parvenus par une sorte d'evolution naturelle des Etres organises qui peuplaient ce premier Monde, sorti immediatement des Mains du Createur ?