Dip Circle used by Sir J.C. Ross
Dip Circle by Robinson, c.1839, used by Sir J.C. Ross
Dip circle by Robinson, c.1839, used by Sir J.C. Ross
Dip Circle by Robinson, c.1839, used by Sir J.C. Ross
Box containing two magnetic needles, from Dip Circle 1876-789 pt.1
Box containing one magnetic needle, from Dip Circle 1876-789 pt.1