I offer the following helps for use in the open or drop method of administering ether. This is the most popular method in this country, and is without doubt the easiest, simplest and safest for the majority of anesthesias, especially for those of limited experience.
This dropper is made from the original ether can (Fig. 1 A) by cutting a circular incision through the soft metal cap of the can, as close to the edge of the neck as possible, holding the knife at right angles to the can. This is extended about four-fifths of the way round (Fig. 1 B). This flap is turned back and a small pledget of cotton inserted (Fig. 1 C); then the flap is turned down to its original position; this will hold the wick in place. Now it is ready for use. Drops of ether will fall from the end of the wick
LUMBARD JE. HELPS IN SURGICAL ANESTHESIA. JAMA. 1912;LIX(21):1853–1855. doi:10.1001/jama.1912.04270110267006