Machine Design
In a band and block brake, the ratio of tensions on the tight and slack sides of band is given by (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks)

T₁/T₂ = [(1 + μ tanθ)/ (1 - μ tanθ)]n
T₁/T₂ = μθ × n
T₁/T₂ = [(1 - μ tanθ)/ (1 + μ tanθ)]n
T₁/T₂ = (μθ)n

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Machine Design
The elasticity is the property of a material which enables it to

Resists fracture due to high impact loads
Retain deformation produced under load permanently
Regains its original shape after deformation when the external forces are removed
Draw into wires by the application of a tensile force

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