1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328 
English Electric
Page 162
If you've noticed an error in this article please click here to report it so we can fix it.
I T is a noteworthy fact that the complete vehicle exhibited on this stand is made by the one concern ; it has done much pioneer work in the develop ment of trolley-buses: The example staged is a double-decker designed to carry 56 persons; it has an overall length of 23 ft. 01 in. The wheelbase is 16 ft. 6 ins, and the turning circle is only 55 ft. Three differentials are used for the bogie, in order that each of the two driven axles may, under all conditions, be equally loaded. Transverse swivelling arrangements are provided at each end of the Woodhead springs, so that there is no twisting stress on
the leaves. The master leaves, incidentally, are of the divided pattern.
Whiles steering is provided and the air cylinders for the mechanical brakes are carried directly upon the axles. In addition to this brake set there is an electrical brake and a parking, or emergency, brake, controlled by a lever, scenting on the four wheels of the bogie. The electrical method of retardation consists of using the propulsion motor as a generator and dissipating in the resistances the energy occasioned thereby.
Two armatures aremounted upon the same shaft of the 80 b.h.p. motor ; this economizes both weight and space. The motor is of the interpole, selfventilated type and has a flat casing to give a low floor height. 'Dynamic balancing is employed. Control is by a foot lever, eight power notches being provided ; a ratchet and bawl mechanism prevents it being moved more than one notch at a time. . The body is carried upon rubber cushions on outriggers. The trolley base is clear of the roof, this being effected in order to 'obviate drumming. The twin trolleys allow travel at a distance of 16 ft. from the wires.