LIGHTING

1p., foolscap 8vo. In fair condition, on aged and worn paper. Addressed on reverse of second leaf to 'John Watson Esquire | Manager of the Gass [sic] Light Coy | New Street | Edinburgh', and docketed '1820 | Davd. Budge & Co | Johns Coffee house | Edinburgh 27 Novr | containing a Statt. of their Burners & hours of burning'.

On three pages of a foolscap bifolium, supplied by J. Warner & Co., Law Stationer of New Oxford Street, ruled and with red borders. Good, on lightly stained paper. On 25 July 1912 Mohr and Friedrich Hansen 'made an application for a Patent for an improvement in the process of the manufacture of a filament for an electric incandescent lamp (at present known as the "Boran Lamp") accompanied by a complete specification at the Patent Office', but the application has not yet been accepted.

Four pages, folio, chipped with small loss of text. IN FRENCH. He begins: "Les nombreuses experiences que j'ai fait sur la lumiere electriquee l'appareil que j'ai confectionne me mettant en meme de pouvoir l'appliquer a l'eclairage des villes avec avantage et economie sur tout autre systeme". He discusses the expense of gas and gives a precis of his plan ("L'agende"), giving letters which correspond to a "dessin" which is not present, and listing his points with a little detail: un ballon de gaz; filet ensoie; cordes en soie; Lampe electrique . .