Hour scale III-ХII-IX with 2-minute devision. Latitude scale 10°-90° with 1/2° devisions and numbering in 10. Two-layer compass scale: on the bottom is 4-rhumb wind rose with additional 8-rhum marking, on the projection is 0-90-0-90-(0) grade scale with devisions in 1° and numbering in 10. List of 15 Russian cities with thier latitudes with 1-minute accuracy is on the base, around the compass. Inscription on holder: “d. Nikolai Chizhov in Sanktpeterburg" (made by Nikolai Chizhov in St. Petersburg).