The instrument1 shown in the illustration will perform all the duties of a Bunsen burner and bacterial loop. It is adaptable to the private office as well as to the general laboratory.
The apparatus consists of a removable holder and loop and a burner set in a stand. The holder and loop are held in position by two posts, which fit corresponding sockets in the stand. When in place, the chrome wire of the loop as well as the stem of the holder is automatically heated. The burner is composed of chrome wire wound on a lava spool and held at an angle to correspond with the inclination of the mouth of test tubes when passed over these coils.
METHOD OF OPERATION
For heating solutions in a test tube (urine, Benedict's solution, and the like) the latter is simply rolled over the coils. Five cubic centimeters of distilled water will boil in forty seconds. Larger amounts of water can be heated over the burner as with a flame.
Rosenthal SR. ELECTRICALLY OPERATED BURNER AND BACTERIAL LOOP. JAMA. 1937;108(23):1969. doi:10.1001/jama.1937.92780230001009