《天工开物·中篇·舟车》
但是黄檀木摩擦久了会发热，因而不太适宜做这些东西，有些细心的人就选用两手才能合抱的枣木或者槐木来做，那当然是最好不过了。
檀质太久劳则发烧，有慎用者合抱枣、槐，其至美也。
But padauk will produce heat after long-time friction and so is not suitable to make these items, some attentive people chose jujube or locust with a diameter around one span, which of course is the best choice.