126 



Percentage of voids, determin 



ation of, 42. 

 Permits, 68. 



Petroleum on forms, 28. 

 Photographs, 68. 

 Placing concrete, 55, 56, 86. 

 Plain or deformed steel, 6. 

 Pointing-up, 69. 

 Points at which work can be 



stopped, 88. 

 Portland cement, definition, 3. 



Position of 

 steel, 36. 



the reinforcing 



Posts and braces, safe loads, 

 92. 



Precautions for work of other 

 trades, 69. 



Pressure of wet concrete (ta- 

 ble) 29. 



Proportioning and grading ag- 

 gregate, 42. 



Proportions of concrete aggre- 

 gates required for 1 yd., 95, 

 96, 97. 



Record of concrete, 57 Effi- 

 cient men, 69 Of work, 89. 



Reinforced concrete girder, typ- 

 ical, 40. 



Reinforcement, column, 38 

 Wall, 35. 



Reinforcing steel, 6, 7 Steel, 

 position of the, 36. 



Removing centering, 84 Col- 

 umn forms, 83 Forms, lad 

 der for, 23 Forms, truck 

 for, 24. 



Removal of forms, 82. 



Removing shores, 25. 



Runways, 55. 



Safe loads in posts and braces, 



92. 

 Sandstone as aggregate, 5. 



, 



Sand, 78 Test for good, 4, 5, 

 78 On mortar, fineness of, 

 (table) 101. 



Sampling cement, 77. 



Screening cinders, 6 Gravel, 6. 



Setting forms, bar for, 26. 



Shaft hangers, 70. 



Sheet metal and wire gauge, 

 (table) 98, 99. 



Sheets of expanded metal, size 

 of, (table) 103. 



Shipping tools and material, 



Signals, 70. 



Slag as aggregate, 5. 



Size of sheets of expanded met- 

 al, (table) 103. 



Silica (SiO 2 ), 4. 



Slide rule, 71. 



Spacers, concrete, 37 Concrete 

 blocks for, 60. 



Specific gravity of cement, sec 

 Standard Specifications, 108. 



Specifications on work, 76. 



Spikes and nails, 93. 



Splatter finish, 72. 



Spreaders in beams and girders, 

 19. 



Stair centering, 27. 



Stationery, 71. 



Standard rules for quick cal- 

 culation, 107 Specifications 

 for cement, 108. 



Steady men, 71. 



Steel, 6, 37, 72, 79 Bending, 

 32 Column forms, 10 

 Clean, 38 Differential for 

 s ; ze> 93 Fabrication and plac- 

 ing, 30 Keeping track of, 

 30 Receipt of, 30 Marking 

 centering for, 39 Position of 

 the reinforcing, 36 Rods, 

 properties of, 94 Shipment 

 of, 30. 



Storage of cement, 78. 



Straps instead of wire in wall 

 centering, 27. 



