Ke Alakai o Hawaii, Volume VI, Number 8, 22 June 1933 — SYNTHETIC JEWEL BEARINGS ARE HARD AS REAL [ARTICLE]

SYNTHETIC JEWEL BEARINGS ARE HARD AS REAL

. Improvenient in manufactur4Qg processes has resulted in j?rodneUon of synthetic jewels „|4i&t ,are as hard as natuxai .siones» more uniform and mueh pheape? for use as bearings iii prēcision instruments. The synthetic ruby has been udopted for watch bearings, synthetic p Cbrundum is gaining ground, behlifog hard, susceptible to high [pclish and incorrodible by ehemNuiaerous tests ~ iiave : that the crystal structure |Qf artificial corundum. is the j toe as thal of the natural s£onē. In producing syiithetic 'jewel bearings, the manufacturstone is split, thcn cut into planes by high speed copper disks.