.
Discs of direct acting screw engine instead of crank.
Dodds, expansion valve by.
Double acting engines, definition of.
Double acting air pumps,
valves of;
faults of.
Draw bolt.
Dredging earth out of rivers, power necessary for.
Driving wheels of locomotives.
Driving piles, power necessary for.
Duplex pump, Worthington's.
Dundonald, Earl of, screw by.
Duty of engines and boilers,
how the duty is ascertainable.
Dynamometer, description of.
Dynamometric power of screw vessels.

Eccentric, description of,
sometimes made loose for backing.
Eccentric and eccentric rod of oscillating engine.
Eccentric notch should be fitted with a brass bush.
Eccentric straps of locomotives,
rods of locomotives.
Eccentrics of locomotives,
how to readjust.
Economy of fuel in steam vessels.
Edwards, expansion valve by.
Elasticity, limits of.
Engine, high pressure, definition of,
low pressure, definition of.
Engines, classification of,
rotative, definition of;
rotatory, definition of;
single acting, definition of;
double acting, definition of;
mode of erecting in a vessel;
how to refix if they have become loose.
Engineers of steam vessels should make proper preparation for accidents.
Equilibrium slide valve,
grid-iron valve.
Erecting engines in a vessel.
Erection of engines in the workshop.
Escape valve on feed pipe.
Escape valves for letting water out of cylinders.
Evaporative efficacy of coal,
of wood, turf, and coke.
Evaporative power of boilers,
power generated by evaporation of a cubic foot of water;
increase of evaporation due to increased exhaustion in locomotives.
Excavator, Otis's.
Exhaustion produced by chimneys,
by the blast in locomotives;
increased evaporation from increased exhaustion.
Expanding mandrels for tubing boilers.
Expansion of air by heat.
Expansion of surcharged steam by heat.
Expansion of steam,
pressure of steam inversely as the space occupied;
law of expansion;
rule for computing the increase of efficiency produced by working
expansively;
necessity of efficient provisions against refrigeration in working
expansively;
advantages of steam jacket;
Forms of apparatus for working expansively: lap on the slide valve
wire drawing the steam;
Cornish expansion valve,
in rotative engines worked by a cam;
mode of varying the degree of expansion;
proper forms of cams;
the link motion;
expansion valves, by Cabrey