Coastal navigator, originally silver-plated copper analogue “computer” on a mahogany panel with mahogany cover, patented by Norwood Harrison and made by T. Barton, Limehouse London.
Harrison's 'New Era' coastal navigator was also sold by H. Hughes Son, 59 Fenchurch St London - a copper analogue computer on a mahogany panel for setting a course by triangulation, patented by Norwood Harrison, who may have been an English master sailor.
The instrument is mounted on a mahogany plate with a mahogany cover with a total size of 50.5 x 36.5 x 9.5 cm.
The cover is removable by means of two sliding hinges and can be locked with two metal sliding hooks.
The metal parts of the instrument are of yellow copper or brass. Originally, the brass was silver-plated. The matt silver layer is still present at the back of the rulers.
The central screw, which holds the metal rulers together, has broken off, but the parts are still present.
The wooden box has some scratches and has a label with a handwritten text:
"This is the TOP Side
Do not jar or shake the
The instrument is numbered: No. 897
A similar instrument with number 902 is present at the Science Museum in London. It is part of the Math Exhibition at the Winton Gallery as an early "analogue computer" and another example in the collection of the Peabody Yale Museum of Natural History
Will be well packaged and sent by registered mail
- Instrument de navigation sur la nouvelle côte de brevet de Norwood Harrison
- Acajou, Cuivre, Laiton
- Norwood Harrison
- T. Barton London
- Coast Navigator
- Époque estimée
- Fin du XIXe siècle
- Pays d’origine
- Bon état - quelques usures et tâches dues à l’âge
- 9.5×36.5×50.5 cm
- 6.47 kg