One ten inch flint glass prism of angle 12 1/2 degrees [mounted with Inv No. 1888-158 and shares the same case] with brass mountings and adjustments to minimum angle divation. Used with a 10-inch refracting telescope with equatorial mount by Cooke at the South Kensington Solar Physics Observatory and is now at the Norman Lockyer Observatory at Sidmouth, Devon.
Case for one ten inch flint glass prism of angle 12 1/2 degrees [mounted with Inv No. 1888-158] with brass mountings and adjustments to minimum angle divation in case. Used with a 10-inch refracting telescope with equatorial mount by Cooke at the South Kensington Solar Physics Observatory and is now at the Norman Lockyer Observatory at Sidmouth, Devon
One ten inch flint glass prism of angle 12 1/2 degrees [mounted with Inv No. 1888-158 and shares the same case] with brass mountings and adjustments to minimum angle divation. Used with a 10-inch refracting telescope with equatorial mount by Cooke at the South Kensington Solar Physics Observatory and is now at the Norman Lockyer Observatory at Sidmouth, Devon.
