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Dip circle by Robinson, c 1830.

1830

Early magnetic apparatus in mahogany box, made by G. Adams and consisting of bar magnets, dipping and compass needles, etc. (5 blank spaces in box)

Early magnetic apparatus in mahogany box

1770-1795

Dip circle, 11 inch needle, by Dollond, c.1820

Dip circle with 11 inch needle, c 1820.

1820

Kew pattern dip circle by Barrow with Creak's Total Force attachment

Kew pattern dip circle by Barrow with Creak total force attachment.

1848-1864