A treatise on soap-making : containing an account of the alkaline materials, test for discovering the presence of an alkali, &c. : with full directions for manufacturing yellow, pure, white, and perfumed hard soap : also, complete instructions for the making of green or soft soap, with other requisites necessary to finish the soap-boiler : to which is added, abstracts of the excise laws relative to hard and soft soap-makers /

Mode of access: Internet.

Soft soldering; hard soldering and brazing; a practical treatise on tools, materials and operations; for the use of metal workers, plumbers, tinners, mechanics and manufacturers,

Mode of access: Internet.