Page:Popular Science Monthly Volume 91.djvu/42

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26 Popular Science Monthly

How Scientists Capture Mosquitoes When making a catch, the trap end Alive for Experiment and Study of the . tube . is Placed over the resting

mosquito, which in attempting to escape

��OCCASIONALLY it is necessary to do something else with a mosquito besides swat- ting it out of existence. In order to study the best methods of annihi- lating it, scientists, health officials and en- tomologists find it neces- sary to classify the insect, dissect it and experiment with it. For these purposes it is nec- essary to collect the mos- quitoes without crushing them.

A collecting tube of any size may be used, but the one most approved is a glass or celluloid tube about five inches long and one inch in

���selects the only way out, toward the light. This leads through the glass cone into the large col- lecting tube. The aver- age time required for a catch is about three seconds. When the col- lection is made for lab- oratory use, not more than ten specimens should be taken in the tube at one time, lest the captives injure one another.

���Above is shown a collector using the mosquito trap to catch live specimens. At left is the tube, natural size

��A Japanese Invents a Curling Iron

KANJI TANAKA, a Japanese residing in Seattle, Washington, has invented a curling iron, which is designed to make the hair-curling operation not only easier but more expeditiously performed. With it the hair may be curled and the iron taken out without the usual un- wrapping process. This is supposed to leave the curl in better form.

By pressing a kind of button the curl- ing is done almost automatically. By another pressure the parts are unlocked so that they can be slipped out separately. Another advantage which Mr. Tanaka claims for his curling iron is that only one hand is required for the operation.

��diameter. When in use one end of this tube is closed with a cork stopper and the other with a specially designed trap, the invention of Dr. T. H. D. Griffiths, of the Public Health Service, of New Orleans, La.

The trap consists of a cork stopper to fit the tube. Into this a one-half inch central opening is bored to accom modate a small somewhat taper- ing glass tube, the outer end of which is one-half inch in diam- eter, diminishing to three- eighths inch in diameter at the opposite, or inner end.

���This curling iron is in two parts so that it can be slipped out of the curl in sep- arate sections

���Sliding nut to rotate worm gear

��Spring

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