Engineering Calculations  -  Useful basic calculations in all disciplines...

Unit Conversions - Length, Area, Volume, Temperature, Speed, Pressure etc.

Scientific / Enginering constants

DIscipline-wise engg data 

Properties of Water

Properties of Air

Properties of Fluids  

Welding Symbols  

Technical Articles - Mech. engineering, Instrument Engineering, Piping etc...

Mathematical Formulas  - Algebra, Mensuration, Trigonometry, Geometry etc...

Properties of Metals  - Iron, Steel, Copper, Aluminium, per second, horsepower...