A national light and heat company for providing our streets and houses with hydrocarbonic gas-lights : on similar principles as they are now supplied with water : four tables of calculation ... prove the immense national profits and increase of revenue by the adoption of this plan, which is to be had at the National Light and Heat Company's office.

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A national light and heat company for providing our streets and houses with hydrocarbonic gas-lights : on similar principles as they are now supplied with water : four tables of calculation ... prove the immense national profits and increase of revenue by the adoption of this plan, which is to be had at the National Light and Heat Company's office. Public Domain Mark. Source: Wellcome Collection.