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The current study deals with the soaked wool fabrics were dyed with natural dyes extracted from the bark of Symplocos racemosa. The optimization was carried out for the different variables; concentration of dyematerial, time for extraction of dye, dyeing time, concentration of mordants methodsof mordanting. Out of the three methods of mordanting, the best shades for dye was obtained using pre-mordanting with lemon juice and vinegar andpost-mordanting with aqueous leaves extract of Rhus parviflora and aqueous leaves extract of Erythrina suberosa . The colour fastness tests indicated that all samples change in colour on exposure to light. The light coloured samples were affected more rapidly as compared to the dark ones. The Lodh bark dyed samples exhibited fairly excellent fastness to light and the results of washing fastness tests showed that dyed samples had good to excellent fastness to washing. Keywords: Symplocos racemosa (Lodh), Erythrina suberosa, Rhus parviflora, Wool fabrics, Fastness, Herbal mordants, Natural dye.

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Cotter joint is a mechanical component which is used in connecting a piston rod to the cross-head of a reciprocating steam engine, a piston rod and its extension as a tailor pump rod, strap end of connecting rod etc. socket is a important component of cotter joint. In this research paper, outer diameter of the socket is calculated using mathematical modeling and result obtained by mathematical modeling is validated using bisection method.

Medicinal Plants have been practised for hundreds of centuries by tribes all over the world. From the earliest times until the end of nineteenth century plants are still the common source of medicinal treatment yet. Using natural, plant-derived medicines that are “healthier” than prescription drugs derived from synthesized products is something that appeals to consumers. In this study, the plant Terminalia bellirica was taken for study due to the mesmerizing medicinal properties of the plant. The antibacterial activities of acetone, ethyl acetate, benzene and methanol extracts of Terminalia bellirica stem bark were tested for four pathogenic bacterial strains by agar disc diffusion method. Among the various extract, acetone extracts showed good antibacterial activity and maximum zone of inhibition was obtained for Staphylococus aureus (zone size 8mm) followed by Pseudomonas aurogenosa (10mm). The results are given in Table-1. Methanol extract showed antibacterial activity against E. coli (zone size 8mm). On the other hand ethyl acetate and benzene extract was found to be totally unaffected against these bacterial strains.