Hobbart-Allfree, Transmission bar failure, what to do, 219
With crosshead link broken, how to proceed, 220

“Hooking-up," meaning of, 160

How to get along with broken valve stem, 179, 180

How to proceed with Walschaert eccentric rod broken, 179

How Walschaert eccentric rod can be changed in length, 167, 168

I

If lead is not desired could the combination lever be dispensed
with? Confusion in the meaning of lead, 158

Indirect valve motion, 26

Inside vs. outside admission valve, 16

Inspection of the erected gear, 101

Instructions for using cardboard valve models on the folder

diagrams, 119 to 121 inclusive

Introducing cut-off, 33

Invention of Walschaert valve gear, 12

Is increase of lead desired?

Does the established amount of lead

Advance of the valve for other

vary in the Walschaert gear?

purposes besides securing lead. Is lead necessary? 156

K

KIND of eccentric used with Walschaert and Stephenson valve
gears.
How the Walschaert motion is reversed, 152

L

LAP and lead, changing the, 194

Lap and lead; cut-off, 17, 18

Lap and lead with Walschaert gear, 30 to 32 inclusive

Location of suspension of the Walschaert link, and carriage of the
valve-stem slide, 169, 170

Location of suspension of Walschaert link, 76 to 80 inclusive
Location of Walschaert eccentric in relation to crank-pin. Is
the Walschaert gear of direct or indirect motion? Changed to
either by the shifting of the reverse lever, 159

Long's diagram of valve events, 109 to III inclusive

L. S. & M. S. Ry. engine with Walschaert gear-heaviest pas-
senger engine, 73, 74

M

MALLET articulated compound engine, 62 to 64 inclusive
Mason's early design of Walschaert gear, 53 to 57 inclusive
Meaning of "cut-off" and "hooking-up," 160

Meaning of the term, "valve motion." From where the valve
gear receives its initial motion. Kind, or style of valve used
with Walschaert gear. Difference between Walschaert and
Stephenson motions, 151, 152

Meaning of "working quarter" of the crank-pin, 165, 166
Medal awarded Walschaert, 14

Method of disconnection, etc., with a broken main rod, 181, 182
Method of disconnection of radius rod, 176, 177

Motor car with Walschaert valve gear, 67

OPPORTUNITY for rigid frame bracing in the use of Walschaert
gear, 140

Outside vs. inside admission valves in connection with Walschaert
gear, 57 to 60 inclusive

P

PERMANENCE of adjustment of the Walschaert gear, 139, 140
Permanency of adjustment of Walschaert eccentric. When
necessary to correct its length, 168

Permanency of the Walschaert gear, 52

Piston and D-slide valves, 17

Piston, broken, or detached, 182

Position of valve in relation to piston. What is meant by "lead,"
153

Preliminary suggestions, 95 to 98 inclusive

Q

QUESTIONS and answers on Walschaert valve gear, 151-185

R

RADIAL valve gears other than the Walschaert, 198 to 236 in-
clusive

Radius rod, 35, 36

Radius rod suspension, 65

Radius rod, testing for length of, 191

Reauleaux and Zeuner diagrams, 114-119

Reasons for Walschaert link curving in opposite direction to the
curve of the Stephenson link. Impossibility of changing the
adjustment, or experimenting, with the Walschaert gear, 162
Relation of eccentrics to crank-pin, 21 to 25 inclusive
Relative positions of reverse lever and radius rod, 161

Reversing gear, 37-39

SECURING lead, 27

S

Securing lead with Stephenson eccentrics. Securing lead with
Walschaert motion. Does the amount of lead remain constant
in the Stephenson motion? 155

Setting valves with Walschaert gear, 189 to 197 inclusive
Set-up of the gear-different styles, 19

Simple comparative test of Walschaert and Stephenson valve
gears, 148

Squaring the valve: by shortening or lengthening the valve stem,
197

Suggestions as to certain dimensions and proportions of the Wal-
schaert gear, 103

T

TEST of Walschaert and Stephenson valve gears, 148

The Allan valve gear, and the Allen valve, 102

The built-up Walschaert gear complete, 42

The combination lever, 29

The dead center, to locate crankpin on, 192, 193

The general effects of lead, 143 to 148 inclusive

The radius rod, 35, 36

The Reauleaux and Zeuner diagrams, 114 to 119 inclusive
The reversing gear, 37 to 39 inclusive

The several effects from lead. Use of a compression instead of

lead, 154

The valve, 15

The Walschaert link, 34

Theory of the combination lever, 96, 97

U

USE of Walschaert gear indicated on engines with crank-axles,
141, 142

V

VALVE gears of De Glehn compound, 69 to 73 inclusive

Valve gears, the three general types of, 198

Valve models, instruction for using, 119-121

Valve motion, indirect, 26

Valve, the, 15

Variations in the angle between eccentric and crank-pin, 121
to 126 inclusive

W

WALSCHAERT eccentric rod changed in length, 167, 168

Walschaert eccentric rod may be changed in length.

of the gear.

Other parts

Does any particular part of the Walschaert gear

have a tendency toward heating? 163
Walschaert gear adjustment, 102

Walschaert gear, Helmholtz modification of, 113, 114

Walschaert gear, Mason's early design, 53-57

Walschaert gear unaffected by side-rod breakage, 84

Walschaert gear with piston valves, 60 to 62 inclusive

Walschaert link, 34

Walschaert link, details of, 44-49

Walschaert link, details of link, Frontispiece

Walschaert locomotive valve gear, names of parts, Frontispiece

Walschaert motion, reversed, 152

Walschaert valve gear, model of, 199

Walschaert's original design of valve gear, 87 to 92 inclusive

Walschaert's patent, 14

What is meant by "lead," 153

What parts of the Walschaert gear should be kept especially free
from lost motion? 163, 164

What to do in case of blown-out front cylinder head, 183, 184

What to do in the case of broken radius rod, 178

Where links between crosshead and combination lever are broken
and lost from both sides of engine, how to determine the correct
length for new ones, 184

“Working quarter" of the crank-pin, meaning of, 165, 166

Ꮓ

ZEUNER and Reauleaux diagrams, 114-119