Balanced magnetometer on tripod stand, part of the self-registering balanced magnetometer and barometer apparatus designed by Charles Brooke, c. 1850. Balanced magnetometer on tripod stand 1850
Declinometer on tripod stand, part of the self-registering declinometer and bifilar magnetometer apparatus designed by Charles Brooke, c. 1850. Declinometer on tripod stand 1850
Photographic registering apparatus, part of the self-registering declinometer and bifilar magnetometer apparatus (1876-841 to 843) designed by Charles Brooke, c. 1850. Photographic registration apparatus 1850
Photographic registration apparatus, part of the self-registering balanced magnetometer and barometer apparatus designed by Charles Brooke, c. 1850. Photographic registration apparatus 1850