Synopsis of Mahomedan Science. 507 



•XJIj zaed, is used for a positive quantity; (jai'U naqus is a 

 minus, or negative quantity. 



i— £*<»« sumuk, height or thickness. 



*.^-« suhu??i, an arrow, is used for an axis, as of a cone. 



^la*w sutuh, a plane ; ^usUa/o ^^Ja*w sutooh mut kqfeeah, re- 

 ciprocal figures. 



(jw«X« sudus, a sextant; (j*.&>! (j*i*a* sudus anakas is the 

 term employed for a reflecting sextant. 



^t shee, the unknown quantity in an equation. 



^AAJcccJJdjJi sat oos shabutyn, an instrument fitted to 

 mark chords of elevations. 



iS& zul, tangent in trigonometry; ^& Jia zul doam, 

 ^j^Xwa-oJIs zul mustooee, and ^jli'Jia zul sanee, cotangent ; 

 ^i*JU>Jis zulsuteenee, and bt^IJIs 2&£ usaba, (quere) J»>»J 

 £J^ digits, applied to the tangent according as the radius is 

 supposed divided into 60 or into 12 parts ; j»l*Xi'J <JIc> zul uqu- 

 dam if radius is supposed, divided into seven parts. A tan- 

 gent to a curve is y«U^> mumas. 



^^JUXfi ilm iluhee, divine science ; the term is also em- 

 ployed for intuitive knowledge in the preface to the Bu- 

 hadur Khanee. 



tij&so *^£ iloom muturufuh, axioms. 



j\.ta.yi] *.Afi ilm ulabusar, optics. 



UIjJJ *.Ac ilm ulmuraeea, catoptrics ; Urn ulanakas is 

 also used for this branch of science, see above. 

 ijfj&sLz uqudutyn, nodes. 



c^Tj-a^a) ^tai fuzul mushturuk, line of common sections 

 of two planes. 



\j~yi qous, an arc ; u*.» and (jmAS-c pi. 



3 u 



