Welding welding was invented in 1893, and around that time another process, oxyfuel welding, became well established. Acetylene was discovered in 1836 by Edmund Davy, but its use was not practical in welding until about 1900, when a suitable torch was developed. At first, oxyfuel welding was one of the more popular welding methods due to its portability and relatively low cost. As the 20th century progressed, however, it fell out of favor for industrial applications. It was largely replaced with arc welding, as advances in metal coverings (known as flux) were made. Flux covering the electrode primarily shields the base
Helen Hughes (scientist) Cawthron Institute. She also spent 13 years on Cawthron Institute's board. Her stepmother was Kathleen Curtis, Lady Rigg, a notable mycologist. Hughes was appointed a Commander of the Order of the British Empire in the 1993 Queen's Birthday Honours. She is a Companion of the Royal Society of New Zealand. Helen Hughes (scientist) Helen Hannah Rigg Hughes was New Zealand's first Parliamentary Commissioner for the Environment. She was appointed in 1987, following the creation of the role by the Environment Act 1986. Hughes discovered her passion for botany while a student at Nelson College for Girls, and studied toward a