Abstract: Device for making monocrystalline gallium arsenide by drawing the crystal from a gallium arsenide-containing melt with adjustment of an arsenic vapor pressure while rotating and lifting the drawing means, said device comprising means for rotating the crucible containing an uncovered melt, and if desired, lifting or lowering the crucible independently of the system, that is to say without rotating the entire quartz apparatus. The means for rotating the crucible includes a ground-in joint formed by the core of the crucible driving shaft and a quartz glass sleeve. The core is made of a material havinga higher coefficient of expansion than quartz glass at the operating temperature of the joint. The accurate seating of the ground-in joint avoids the formation of surface waves on the melt.