"compositor" - Translation from English to Arabic

Oh, pshaw, my dear fellow, what do the public, the great unobservant public, who can hardly tell a weaver by his tooth or a compositor by his left thumb, care about the finer shades of analysis and deduction?
اوه يا صديقى العزيز, ماذا يعمل الجمهور الجمهور الغافل العظيم, والذى لا يستطيع الاخبار عن حائك باسنانه