Handy man's workshop and laboratory . theadding of water work in the same direction, namely, to decreasethe opacity of milk. The same cannot be said of the increases it, adding water decreases it; and the com-mon test, which consists in the mere introduction of the lacto- HANDY MAN S WORKSHOP AND LABORATORY 351 densimeter in milk, is worthless, as a skimmed milk may have anormal density if care has been taken to pour into it a certainamount of water. Density should be taken before and after skim-ming, and the percentage of cream should be determined withthe creamometer. Thus a
Handy man's workshop and laboratory . theadding of water work in the same direction, namely, to decreasethe opacity of milk. The same cannot be said of the increases it, adding water decreases it; and the com-mon test, which consists in the mere introduction of the lacto- HANDY MAN S WORKSHOP AND LABORATORY 351 densimeter in milk, is worthless, as a skimmed milk may have anormal density if care has been taken to pour into it a certainamount of water. Density should be taken before and after skim-ming, and the percentage of cream should be determined withthe creamometer. Thus applied, the density test requires a lacto-densimeter, a thermometer, and a creamometer, and the test re-quires twenty-four hours, while the result is not much more ac-curate than the opacity test just described.—58 SIMPLE METHOD OF PULLING A CORK If you own a corkscrew of the kind illustrated, you can easilyremove the tightest cork without fear of soiling your turning the screw well into the cork, place the lip of the. Fig. 293—Simple method of pulling a cork bottle under the edge of a table or shelf, then with the upper sur-face of the table as a rest, lift up on the handle of the implement,and the cork will follow smoothly.—33 WATERPROOF MATCHES Perhaps some of your readers would be interested to know thatI have found a simple, inexpensive way to waterproof matches. i iT o> HANDY At AN S WORKSHOP AND LABORATORY Into some melted paraffine (care being taken that it was as coolas possible) I dipped a few ordinary parlor matches. Afterwithdrawing them and allowing them to cool it was found thatthey scratched almost as easily as before being coated with thewax. Several were held under water for six or seven hours andall of them lighted as easilyas before immersion. When thematch is scratched the paraffine is first rubbed off and the matchlights in the usual way. Matches treated as above would be very useful on camping orcanoeing trips, as they do not absorb
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