in fact, a complete train, and not, as sometimes supposed, a
locomotive only, of an especial type, which has been the object he set
before him. Before entering into other considerations, we shall first
give a description of the stock proposed by M. Estrade. The idea of
the invention consists in the use of coupled wheels of large diameter
and in the adoption of a new system of double suspension.

The locomotive and tender we illustrate were constructed by MM. Boulet
& Co. The locomotive is carried on six driving wheels, 8 feet 3 inches
in diameter. The total weight of the engine is thus utilized for
adhesion. The accompanying table gives the principal dimensions:


TABLE I.

+---------------------------------------+
| | ft. in. |
+-----------------------+---------------+
|Total length of engine.| 32 8 |
+-----------------------+---------------+
|Width between frames. | 4 1 |
+-----------------------+---------------+
|Wheel base, total. | 16 9 |
+-----------------------+---------------+
|Diameter of cylinder. | 1 6½ |
+-----------------------+---------------+
|Length of stroke. | 2 3½ |
+-----------------------+---------------+
|Grate surface. | 25 sq. feet. |
+-----------------------+---------------+