Earthen Mustard Pots Used as Acid Jars
A Bottle Made from an Earthen Mustard Pot to Contain Acid
A small earthen mustard pot of the type shown makes an ideal acid pot for the bench, as it is not only acid-proof but will not upset so easily as the ordinary acid bottle. The large cork, or stopper of soft wood, thoroughly boiled in hot paraffin, is bored for the insertion of another paraffined cork holding the acid-brush handle. If a coat of paraffin is given the handle, it will easily resist the action of the acid and last much longer.
Squeezing Paste from Tubes
Tubes of paste, glue, etc., may be more easily handled by applying an ordinary key, such as found on most cans containing fish put up in oil. The end of the tube is inserted in the slot of the key and then turned.—Contributed by J. H. Priestly, Lawrence, Mass.
Seeing an Alternating Current in a Mirror
It will almost appear impossible to those unfamiliar with laboratory methods that one may watch the vibrations—3,600 per minute—of an alternating current in a little pocket mirror without the use of any apparatus other than a telephone receiver. The experiment is very interesting and instructive, one that may be performed at practically no expense.
