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Cyclopedia of Architecture, Carpentry and Building : A General Reference Work (1912)

Strength Of
Strength Of Beamsó(concluded). 62. First Beam Formula. As Shown In The Preceding Article, The Resisting And Bending Moment's For Any Section Of A Beam Are Equal; Hence All The Symbols Referring To The Same Section. This Is The Most Important Formula Relating To Beams, And Will Be Called The "first ...

Strength Of Shafts
Strength Of Shafts. A Shaft Is A Part Of A Machine Or System Of Machines, And Is Used To Transmit Power By Virtue Of Its Torsional Strength, Or Resist Ance .to Twisting. Shafts Are Almost Always Made Of Metal And Are Usually Circular In Cross-section, Being Sometimes Made Hollow. 90. ...

Structural Materials
Structural Materials. Classification Of Natural Stones. The Rocks From Which The Stones For Building Are Selected Are Classified According To (1) Their Geological Position, (2) Their Physical Structure, And (3) Their Chemical Composition. Geological Classification. The Geological Position Of Rocks Has But Little Connection With Their Properties As Building Materials. ...

Testing Cements
Testing Cements. The Quality Or Constructive Value Of A Cement Is Generally Ascer Tained By Submitting A Sample Of The Particular Cement To A Series Of Tests. The Properties Usually Examined Are The Color, Weight, Activity, Soundness, Fineness And Tensile Strength. Chemical Analysis Is Some Times Made, And Specific Gravity ...

Tests For Stone
Tests For Stone. The Relative Enduring Qualities Of Different Stones Are Usually Ascertained By Noting The Weight Of Water They Absorb In A Given Time. The Best Stones As A Rule Absorb The Smallest Amount Of Water. Some Stones, However, Come From The Quarry Soaked With Water And In That ...

Tools Used In Stone
Tools Used In Stone Cutting. The Hammer Is A Heavy Tool, Weighing From 20 To 30 Pounds, Used For Roughly Shaping Stones As They Come From The Quarry And For Knocking Off Projections. This Is Used For Only The Roughest Work. The Face Hammer Has One Blunt And One Cutting ...

Walls
Walls. Walls Are Constructions Of Stone, Brick, Or Other Materials, And Serve To Retain Earth Or Water, Or In Buildings To Support The Roof And Floors And To Keep Out The Weather. The Following Points Should Be Attended To In The Construction Of Walls: The Whole Of The Walling Of ...

X 10 1 R
R, X 10-1,000 X 9-2,000 X 4-3,000 X 2-400 X 5=0. The First One Reduces To 10 39,000, Or R.= 3,900 Pounds; And The Second To 10 25,000, Or 2,500 Pounds. 4. What Are The Total Reactions In Example 2 If The Beam Weighs 42 Pounds Per Foot I As ...

X 14 I R
R,' X 14 -i- R," X 20- 3,100 X 24.4-6,200 X 12.2 - R2 X 20 = 0. As In (b) We Find From The First Two Equations The Values Of R," And R2. These Values Substituted In The Third Equation Change It To X 14 + 6,373 X 20 ...