Al-Jazari, Ismail ibn al-Razzaz

Badi al-Zaman Abu al-Izz Ismail ibn al-Razzaz al-Jazari was an engineer and author on mechanical devices. TDV calls him an Islamic scholar and says little is known of his life beyond his book's introduction ¹. It records service to the Artuqids at Amid in 1181–1206 and a book commissioned by Nasir al-Din Mahmud, completed in 1205 according to the entry ¹. Service dates are not converted into birth and death dates.

TDV connects the book to Artuqid patronage; the Met's catalogue likewise identifies Nasir al-Din Mahmud, ruler of Amid, as its commissioner ^{1 2}. This documents work and patronage, not a childhood or training supplied from conjecture.

TDV's description “Islamic scholar” is the Muslim identity basis here. The passage gives no personal school: the museum records its Sunni default frame explicitly, not inferred from his name, origin or workplace ¹.

TDV gives the titles Kitab fi marifat al-hiyal al-handasiyya and al-Jami bayn al-ilm wa-l-amal al-nafi fi sinaat al-hiyal. Its six divisions cover clocks, vessels for drinking and banquets, handwashing and bloodletting vessels, fountains and automatic musical instruments, water-raising machines and miscellaneous devices ¹. The first four have ten chapters each and the last two five each: fifty devices in the account ¹.

The encyclopedia describes coloured drawings, lettered parts and instructions moving from the general form to making components, assembly and operation ¹. It is therefore not simply a picture gallery of marvels: manufacturing detail belongs to its text.

TDV places him in a tradition extending from Hellenistic engineering to the Banu Musa, describing an engineer improving earlier work, not the inventor of every underlying principle in his book ¹. Attribution of a particular device is kept separate from claiming he invented clocks, pumping and automated motion as a whole.

An example is the elephant clock. The Met describes the rider and bird moving, a ball passing to a dragon and then a vessel and gong every half hour, and counting balls to determine elapsed time ². Features TDV assigns to another clock or a pump are not transferred to this machine.

Cleveland's folio preserves the peacock washer design: collected water raises a float, releasing a soap-bearing figure and then a towel-bearing one; used water drains through a spigot ³. The museum attributes the book to al-Jazari but explicitly says construction of this device is uncertain. Its leaf is a Syrian copy of 1315, not a surviving machine ⁴.

Another example is the double-piston pump: flowing water drives a wheel and gears, with a pin and slotted rod converting rotation into reciprocating piston-rod motion ¹. Al-Hassani explains a synchronized pair; the Science Museum holds a half-size model, not an original machine from al-Jazari's lifetime ^{5 6}. Al-Hassani gives book completion as 1206, against TDV's 1205. The pump record preserves the difference as a documentary date, not a dated physical installation ^{7 1}.

TDV records Donald Hill's complete English translation in 1974 and Ahmad Yusuf al-Hassan's Arabic edition in 1979 using the Bodleian and Istanbul copies ¹. These are editions reported by the reference, not primary pages this article claims to have independently read.

Met folio 57.51.23 preserves the elephant-clock image in a copy by Farrukh ibn Abd al-Latif, dated 715/1315, probably produced in Syria or Iraq ⁸. Copyist and original engineer-author are distinct. The page witnesses the book's transmission and illustration, not a surviving original machine.

• Sadettin Ökten, “CEZERÎ, İsmâil b. Rezzâz”, TDV Encyclopedia of Islam, vol. 7, 1993, pp. 505–506. ¹
• Metropolitan Museum of Art, Elephant Clock, 57.51.23, metadata and Francesca Leoni's catalogue entry. ²
• Salim al-Hassani, “Al-Jazari: The Mechanical Genius”, pump discussion, drawing and model. ⁵
• Science Museum Group, double-piston pump model, 1976-482. ⁶
• Cleveland Museum of Art, peacock washer, 1945.383, recto and verso catalogue entries. ⁹