et, if not, then we may ask, what became of the
Rocket of 1830? It is not at all improbable that the first Rocket was cast
on one side, until it was bought by Lord Dundonald, and that its history is
set out with fair accuracy above. But the Rocket of the Manchester and
Liverpool Railway is hardly less worthy of attention than its immediate
predecessor, and concerning it information is needed. Any scrap of
information, however apparently trifling, that can be thrown on this
subject by our readers will be highly valued, and given an appropriate
place in our pages.--_The Engineer_.

* * * * *

The largest grain elevator in the world, says the _Nashville American_, is
that just constructed at Newport News under the auspices of the Chesapeake
& Ohio Railway Co. It is 90 ft. wide, 386 ft. long, and about 164 ft. high,
with engine and boiler rooms 40 x 100 ft. and 40 ft. high. In its
construction there were used about 3,000 piles, 100,000 ft. of white-oak
timber, 82,000 cu. ft. of stone, 800,000 brick, 6,000,000 ft. of pine and
spruce lumber, 4,500 kegs of nails, 6 large boilers, 2 large engines, 200
tons of machinery, 20 large hopper-scales, and 17,200 ft. of rubber belts,
from 8 to 48 in. wide and 50 to 1,700 ft. long; in addition, there were
8,000 elevator buckets, and other material. The storage capacity is
1,600,000 bushels, with a receiving capacity of 30,000, and a shipping
capacity of 20,000 bushels per hour.

* * * * *

THE FLOW OF WATER THROUGH TURBINES AND SCREW PROPELLERS.

[Footnote: Paper read before the British Association at Montreal.]

By Mr. ARTHUR RIGG, C.E.

Literature relating to turbines probably stands unrivaled among all that
concerns questions of hydraulic engineering, not so much in its voluminous
character as in the extent to which purely theoretical writers have ignored
facts, or practical writers have relied upon empirical rules rather than
upon any sound theory. In relation to this view, it may suffice to note
that theoretical deductions have frequently been based upon a
generalization that "streams of water must enter the buckets of a turbine
without shock, and leave them without velocity." Both these assumed
conditions are misleading, and it is now well known that in every good
turbine both are carefully disobeyed. So-called practical writers, as a
rule, fail to give much useful information, and their task seems rather i