The back contains 6 scales of the following types:
| Type (click to view scale details) |
Range & Units | Numbered | Geometry | Location |
|---|---|---|---|---|
| Altitude | 0 - 90, Degrees of arc | Every 5 degrees | Circular, concentric | Upper right quadrant of outer circular on back of instrument. |
| Altitude | 0 - 90, Degrees of arc | Every 5 degrees | Circular, concentric | Upper left quadrant of outer circular on back of instrument. |
| Dastūr Circle | None | None | Upper left quadrant (inside circular scales) | |
| Cotangent | 0 - 50, Fingers | Every 1 fingers | Circular, concentric | Lower left quadrant of outer circular on back of instrument. |
| Cotangent | 0 - 25, Feet | Every 1 feet | Circular, concentric | Lower right quadrant of outer circular on back of instrument. |
| Shadow square | 0 - 12, Fingers | Every 1 fingers | Box | Left hand vertical 'face' of the shadow square (in LL) |
| Shadow square | 0 - 12, Fingers | Every 1 fingers | Box | Left hand bottom face of the shadow square (in LL) |
| Shadow square | 0 - 7, Feet | Every 1 feet | Box | Right hand bottom face of the shadow square (in LR) |
| Shadow square | 0 - 7, Feet | Every 1 feet | Box | Right hand vertical face of the shadow square (in LR) |
| Transcription | Translation | Notes | Type |
|---|---|---|---|
| أتحافر ذلك في أيام معدلت السلطان الأعظم والخاقان المعظم مولى ملوك الترك والعرب والعجم سلطان سلاطين الآفاق ومالك رقاب الأمم بالأستحقاق شاه عباس الصفوي الحسيني بهادر (بهاذر؟) خان خلد الله ملكه وسلطانه في تأريخ سنة ست وتسعين وتسعماية | I engrave this in the time of the just sultan, the greatest, the glorified Khāqān, master of the sovereigns of the Turks, the Arabs, the Persians, legitimately the sultan of the sultans of the horizons, and master of the necks of the nations, Shāh ʿAbbās, the Safawid, the Husainite, Bahādur Khān. May God make eternal his sovereignty and his power, in the year 996. | Inscription in the upper right quadrant | Dedication |
| لا زالت ألوية دولته الأدبية مرفوعة يتأييد الحضرة الرفيعة المنيعة الملكية الأعظمية العادلية القهرمانية المرشدية الخانية ضمن الله معدلته بنظام أحوال المسلمين بالطاف الصمدانية | The flags of his eternal nation have not ceased to be raised by the support of the august Majesty, powerful, royal, great, leonine, who shows the right way, the Khān. May God maintain his justice by the order of the states of the Muslims by divine favours. | Inscription sideways on the right side, spanning the upper and lower halves | Dedication |
| راقم الخطوط والدوائر والرقوم محمد أمين بن أميرزا خان النخعي ثم القمي حامداً مصلياً | The delineator of the lines, circles and numerals is Muḥammad Amīn ibn Amīrzā Khān al-Nakhʿī, then al-Qummī, praising and praying. | Inscription in the lower right segment | Maker's signature |