A Manual of Telegraph Construction: The Mechanical Elements of Electric Telegraph Engineering

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C. Griffin and Company, 1875 - 421 من الصفحات
 

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المحتويات

Rectangular Components
13
Resultant of any number of Inclined Forces not in the same Plane
14
Forces acting on a Rigid Bod
15
Moment of Force described and delined
16
CoupleDescription Definitions Moment of Representation
17
CouplesProperties of Parallelogram
18
Parallel Forces Principle of the Lever
19
Resultant of a Couple and Single Force in the same Plane or Parallel Planes
20
Work described and illustrated
21
Kinetic Energy of a Body in Motion
22
Units of Work
23
Work done in turning a Body about an Axis
24
Friction between Axles and Bearings between similar and dissimilar Materials Effect of Smoothness or Roughness of Surface
25
Stability of Earthwork and Blockwork due to Friction Stability of Friction Effect of Moisture on Angle of Repose of Earth
26
Action of Driving Bands
27
Coefficients of Friction Table of
28
Load Strain Stress Stiffness
29
Set
31
Dead and Live Loads and their relative Factors of Safety
32
Effects of Vibration and Shocks
33
Conditions imposed on the Uses of Materials by their Natures and the Modes of Working them
34
Elevation of Temperature and Strength
35
Moduli of Strength
36
Different Forms of Strength Elasticity c
37
Resistance to Crushing compared with Pliability and Resist ance to Stretching
38
Phenomena of Crushing how influenced by Nature of Material
39
Strut defined Elements determining the Strength of Struts
40
Formula for Strut of any Material
41
GKArH taoh 79 Formula for Oak and Red Pine
42
Failure of Long Timber Columns
43
Pressure required to indent Wood transversely
44
Resistance to Tension 86 Phenomena of Fracture of Tough Materials
45
Strength of Fibrous Substances Effect of Rolling Wiredrawing and Ligatures on Wires
46
Influence of Lateral Dimensions and Shape
47
Effect of Temperature on Tensile Strength
48
Tenacity of Ropes and Chains Foxs Rule
49
Mallets or Poncelets Coefficient
50
Common Instances of Shearing Stress
51
Moment of Load
53
Deflection as affected by Mode of Support
72
Constants of Deflection
73
Frames 145 Definitions
74
Frames definedtbeir Rigidity not due to Stiffness of Joints 7
77
Frames of Strut and Tie 7S 153 Frames of Three or more Bars forming Closed Figures
80
Frames of Three or more Bars forming Open Figures
82
Braced Frames Trusses
83
Funicular Polygon St 157 Telegraph Poles on Curves
85
Examples illustrating Application of the above Principles to Telegraph Poles Strutted and Tied
86
Section IL Stability of Earth 160 Frictional Stability
91
StabiUty of a Single Block
92
Moment of Stability
93
Application of Principles to a Structure composed of Several Blocks or Layers
94
General Application and Influence of Height of Centre of Gravity on Stability
95
Description of CurveIts Mechanical Properties tic 169 Calculation of any Ordinate and the Dip
97
Maximum Span practicable with a given Material 9S 171 Length of Wire Arc
99
Effect of Elasticity of Wire on Dip and Tension
100
Points of Suspension differing in Height to find Position of Vertex
101
Use of Curves Cut to Scale
102
Stability Motion and Friction in Fluids 178 Principle of Hydrostatics
103
Intensity of Pressure of Columns of Water and AirNumerical Data
104
Torsive Strength how affected by Area and Shape of Section how expressed in Tables 52
105
Friction between Liquid and Immersed Solid
106
Laws of Torsional Stiffness 53
107
Modulus of Cable
108
Summary of Conditions of Submersion
109
Transverse Strength described Beam defined and described
110
Condition of Strained Bar Mode of Failure
111
Distribution of Stress over Cross Section
112
Action of Loads below and exceeding Proof Load compared
113
Transverse Strength cannot be calculated from Resistance to Tension and Pressure
114
Efficiency of Matter increases as its Distance from Neutral Plane Flanged Beams
115
Relations between Strength and Depth and Width of Beam
116
Functions of Web in Flanged Beams
117
Bending Moment how resisted
118
Strength as affected by Length of Span
119
Amount and Distribution of Shearing Stress and Bending Moment over Length of Cantilever
120
Amount and Distribution of Shearing Stress and Bending Moment in Beam supported at both Ends
121
Distribution of Shearing Stress over Cross Section Proportions of Web in Flanged Beam
122
Action of Distributed andConcentrated Loads compared
123
Relative Strengths of Beams according to Mode of Support
124
Relative Strengths of Fixed and merely Supported Beams
125
Telegraph Poles considered as Beams
126
Relative Strengths of Beams of Different Shaped Sections Hoi low and Solid
127
Box Tubular and Lattice Girders Telegraph Poles on these Principles
128
Strength of Beams and Telegraph Poles of Complex Form of Section how ascertained
129
Allowances for Bolt Holes c in Beams
130
Built Beams Coupled Poles
131
Forms of Beams in which Strength is proportioned to Bending Moment at each Section Cantilever
132
Forms of Beam supported at both Ends
133
The Principles applied to Telegraph Posts
134
Allowance for Weight of Beam
135
Beam Inclined to Load
136
Transverse Strength of Materials how represented in Tables
137
Deflection of similar Beams as affected by Dimensions of Beam under Load less than Proof Load
138
Deflection of similar Beams as affected by Dimensions of Beam
139
Simple Masts Building in Lengths
140
Simple Masts Building in Thickness
141
Compound Masts Ladders for 14
150
Compound Masts Rake
151
Simple Masts Shaping
152
Adhesion of Earth
153
Tools
154
Excavating
156
Boring
157
Filling and Embanking
158
Sinking of made Earth
160
Labour of Jumping in Rock
161
Foundations 248 Definitions and Description
162
251 Foundations on Rock
163
253 Foundations in Soft Earth
164
Foundations in very Soft Earth 105
166
Foundations under Water 100
167
Cementing Materials
168
PAHA uiura IMOK 291 Pointing
187
Metals and Allovs Section LIron Division LCast Iron 293 Cast Iron Steel and Wrought Iron
188
Sources of Supply Smelting
189
Effects of Accidental Constituents
190
Qualities of Cast Iron
191
Casting
192
Coefhcient of Expansion by Heat
204
Alloys Tinning Galvanising 214
205
Bed and Cold Shortness 2110
207
Tenacity of Wire
209
Ultimate Extension
212
Density and Heaviness
255
rvtM ORAftf 257 Calcareous Cements described generally
257
Rich Lime
258
Common Mortar
259
Hydraulic Lime and Mortar
260
Pozzolanas
261
Calcareous Cements Proper Adhesion of Mortar
262
Application of Calcareous Cements
263
Plaster
264
Insulator Cements
265
Resin and Ashes
266
Sulphur Cements
267
Marine Glue
268
Common and Mixed Glue
269
Electrical Flexible and other Cements
270
Concrete
271
Beton
272
Concrete and Beton compared with Masonry
273
Concrete and Beton and their Application
274
Asphalt
275
Asphaltic Mastics True and Factitious and Concrete
276
Applications of Asphalt
277
36S Drying Oils their Compounds c
278
Technical Terms
279
General Rules for Construction
280
Shaping and Dressing Stones
281
2S2 Different Qualities of Masonry 283 Bond
283
Volume of Mortar
284
Miscellaneous Observations
285
Brickwork General Rules
286
Brickwork Construction Bond
288
Measurement and Labour of Masonry and Brickwork
289
Strength of Masonry and Brickwork Factors of Safety
290
Grinding
291
r uu GHArH PAGS 377 Wire Nippers
292
Abrading Tools Files Rasps Ac
293
Ladders and Appliances for Climbing 29S 386 Painting and Varnishing
299
Soldering 3S7 Description and Conditions
300
Composition of Solders 801
302
Sources of Heat
303
Fluxes
304
Soft Soldering
305
Surveying Drawing dx
306
Units of Measurement
307
Trigonometrical Formulae
311
Surveying with the Chain and by Angular Measurements
313
Levelling and Sounding
315
Drawing Instruments
316
Plans Scales for
317
Mechanical Drawings
319
Resistance to Transverse Load Shearing and Torsion
322
Tenacity of Riveted Joints
323
Resistance to Bursting and Collapse
324
Resistance of Plane and Buckled Plates
325
Proof Load Factors of Safety
326
Stiffness of Beams and Telegraph Poles
327
Moduli of Elasticity and Resilience
328
Fastenings
329
Joints
330
Struts Ties and Beams
331
Iron Posts and Masts
332
Wire Specifications
333
Other Applications of Iron in Telegraph Construction
334
Preservation of Ironwork
335
Comparison between Iron and Wood as tion Materials of Construc
336
Processes of Production
337
Properties
338
Comparison between Wrought Iron and Steel Working Load
339
Application of Steel to Cutting Instruments and Tools
340
Other Applications of Steel
341
Application of Steel and Homogeneous Metal as Materials of Construction
342
Copper
343
Zinc
344
Lead
345
Tin
346
Alloys
347
Sources of Supply
348
Manufacture
349
Chemical Composition and Properties
350
Arrangement of Town Lines
353
Tools for Construction 354
355
Estimating 420 Definitions
356
Estimate Proper
358
Estimate for Stores
359
Estimate for Transport of Stores
360
Estimate for Distribution of Stores
361
Estimate for Miscellaneous Charges
363
Estimate for Repairs
364
Construction of Land Lines 433 Marking out Sounding Rivers 4c
365
Carriage and Distribution of Materials 372
372
Organisation of Labour
373
Digging Holes for Poles and Anchors
374
Erecting Supports
375
Erecting Overhead Wires and Laying Underground Wires
377
Effects of Heat 25S 253 253 255
378
General Description
385
Ratio between Sectional Areas of Conductor and lusulator
389
Tensile Strength and Factor of Safety
391
Laying Long Cables
392
Laying Short Cables
395
Picking up
399
Coiling 4c
402
Fittings and Arrangement of Offices 450 Conducting Wiies
403
Commutators and Connection Boards
405
Lightning Dischargers Earth Lines c
406
Batteries
407
Furniture Lighting 4c
408
Maintenance and Organisation Section I Repairs 459 Classification of Repairs
409
Supply of Materials
410
Checks on Expenditure ami Work
412
Organisation 464 Organisation
413
Camp Equipage and Camping
417
Travelling and Transport
418
Management of Labour 4c
419

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