Small angle X-ray scattering (SAXRS) techniques are employed to investigate structure of macromolecules. The theory is simple bearing an inverse relationship between the particle dimensions and the scattering angle. But the instrument is sophisticated yielding high resolution. Kratky Camera of latest design has been used. Latest theories of Kratky and Porod are also used to investigate the pore ... [Show full abstract] structure of giant molecules of cellulise in Jute. Babinet’s reciprocal relationship as in Optics has been considered. Here instrumental techniques are also discussed.