Rapidograph (capillary alkalami) - a ga kayan aiki daidai Shirin zanen aiki. Kunshi karamin tube da kuma harsashi ga tawada. A cikin tube ne mai bakin ciki allura, wanda yake shi ne da alhakin barga samar da Paint. Ana iya dace amfani da su haifar da zane da kuma tawada zane. Amfani da gine-ginen, mai hoto artists, cartographers, injiniyoyi, decorators da kuma zanen kaya. Na dogon lokaci domin jawo tawada yi amfani da kayan aiki da ake kira jawo alkalami. Duk da haka, a cikin aikace-aikace na da wasu wahala: zane jawo alkalami ba zai iya daidai daidaita kauri daga cikin line kuma a kan takarda zai iya zama Yana shãfe. A 1928, kamfanin ya kwararru Rotring da aka ƙirƙira na farko marmaro alkalami, da ake kira «Tiku» ko «Inkograph», a cikin abin da maimakon saba alkalami tube amfani. Ta rubuta a fili, ba tare da ya bar na leaked kuma Yana shãfe. A 1953, bisa ga Tiku wani samfur alkalami don jawo mai taken rapidograph (Rapidograph), ya yarda su riƙe line tsananin tsare kauri da kuma samar da wani uniform kwarara daga tawada.