IRON BUILDINGS; TUGBOATS.
153
stage carried a platform 25 metres (82 ft.) high and
5 metres (16 ft. 5 in.) wide, on which ran a steam winch
which worked a double derrick. The gantry was arrangée!
so as to cover the complété space between two bays, and
consisted of a series of floors which served to support each
2. Halls for Exhibitions. —Machinery Hall of the
Paris Exhibition of 1878.—A fixed rule for buildings of t
this kind eannot be set clown beforehand, as their size
and shape dépend entirely upon the space available, the
nature of the exhibits, the extent to which the ornamental
Fig. 508. Shop for the Forges et Chantiers de la Mediterranée.
Fig. 509. Shop for the Forges et Chantiers de la Mediterranée.
Light Trusses.
half truss during érection and riveting, until the time
when the ridge rotulas were put in place.
The érection was superintended most satisfactorily by
the f'oreman belonging to the Chalon Works, and who has
charge of ail the bridges and buildings delivered by
Messrs. Schneider and Co. to Chili.
part has to be carried, &c. Their designing is as much
the work of an architect as that of a civil engineer. It
may be added, however, that one generally expects,for each
exhibition, to witness a step forward realised in civil
engineering. The great machinery hall of the Paris
Exhibition of 1878 (see Fig. 507), built by Messrs1