We just acquired a very curious little book. Die Glasschmelzkunst (Vienna: Schultz, 1769) is a manual for 18th-century do-it-yourself chemists. It provides detailed instruction for manufacturing thermometers, hydrometers, barometers and even glass eyes. But it was figure 15 in the illustration here that caught our attention.
You can come in and see it now by asking for Rauner Rare TP 859.2 .B11 1769.