A gas network for lighting and heating was introduced in the 1880s. The model town of Saltaire was founded, along with others, as a planned environment with good sanitation and many civic, educational and recreational facilities, although it lacked a pub, which was regarded as a focus of dissent. Although initially developed in the early years of the 19th century, gas lighting became widespread during the Victorian era in industry, homes, public buildings and the streets. The invention of the incandescent gas mantle in the 1890s greatly improved light output and ensured its survival as late as the 1960s. Hundreds of gasworks were constructed in cities and towns across the country. In 1882, incandescent electric lights were introduced to London streets, although it took many years before they were installed everywhere.