The limb has a scale of hours 0 to 12 twice, divided to 20 minutes, subdivided to 4 minutes, numbered by 1 hour.

Rete for 21 named stars. Ecliptic circle with zodiacal names, each with a scale of 30 degrees, divided to 10, subdivided to 2. Meridian bar counterchanged four times. Four dots close to the pivot hole on the verso.

Four plates, each one fully engraved for only one latitude, as follows: 42? (unfinished verso with a set of unequal hour lines); 45? (unfinished verso with tropics, equator, meridian and east-west lines); 'Parisi' (unfinished verso with tropics, equator, meridian and east-west lines); 52? (verso with tablet of horizons). The projection for each latitude has azimuth lines for every 15 degrees, almucantars for every 3 degrees (every fifth almucantar indicated by short lines and the first and second are numbered '3' and '6' respectively, to show that the progression is by 3), unequal hour lines beneath the horizon, numbered by 2. Each latitude plate has 4 dots on the verso close to the pivot hole and 4 on either side of the lug.

The back has a degree scale on the limb, 0 to 90 to 0 to 90 to 0, divided to 5, subdivided to 1, numbered by 10. The same scale , renumbered in the inside, serves for the zodiacal scale, with abbreviated names of the signs, each with a scale 0 to 30, numbered by 10. Within this is an eccentric calendar scale, with month names in Latin, abbreviated where appropriate, each with a scale of days, divided to 5, subdivided to 1, numbered by 10 as appropriate. The first point of Aires is at 111/2 March. In the central space, two quadrants are occupied by an unequal-hour diagram, with lines for hours 0 to 6 to 0; two with a double shadow square, with scales 0 to 12 to 0 to 10 to 0, divided to 4, subdivided to 1, numbered by 4.

Counterchanged alidade, shaped ends, vanes with pinhole sights. One arm of the laidade has a scale of unequal hours. Later bolt and nut.