《天工开物·中篇·陶埏》
无论是缸窑还瓶窑都不是建在平地上，必须建在一座小山斜坡上，比较高的窑有二三十丈，矮的窑也有十多丈，几十个窑连接在一起，一个窑比一个窑高。
凡缸、瓶窑不于平地，必于斜阜山冈之上，延长者或二三十丈，短者亦十余丈，连接为数十窑，皆一窑高一级。
Regardless of whether it is a jar kiln or a bottle kiln, it is not built on flat ground, but instead must be built on a small hillside. Taller kilns can be twenty to thirty meters tall, while shorter kilns can be over ten meters tall. Dozens of kilns are connected, with each kiln being taller than the last.