The Montgomery advertiser., 1905-04-23
SCIENTIFIC MISCELLANY
MAGNETISM IS MOTION-THE NEW BAROMETER-STAN TIME
 ON TAP.
Vaccination In COIOred Iight--NnturaI Flowers with Artificial Perfume ParadOxIcaI Heating-fmitat-
 ing Nature in Navigation.

The so-called "Piesmic barometer - the novel instrument of A. S DaVls- is a mercurial barometer reduced all most to pocket size, and depends on the simple principle that the moro gas is already compressed the less given additional pressure will reduce its volume. It consists of a U-tube, with a seven-inch arm of thick glass and one-tenth bore and somewhat shorter closed arm of thin quill tub ing, a small iron mercury -cistern being attached to the top of the long arm. Resting horizontally. the tube is filled with air. the mercury being at one side of the cistern. Placing the tube up right, the mercury descends the long arm to a varying distance, stopping at ! inches if the atmospheric pressure IS 30 inches, at inches if the pressure IS 29 inches. and SC on.
 A new rain-guage records the drops made to fall on a delicately- y-balanced lever, thus indicating the rainfall fer any minute as well as the total III the shower or storm.
 Two electric circuits connected with the Paris Observatory control fifteen standard clocks. but the system .s complicated and costly. The new wire less distribution of correct time by M. B12OurQdn, the ODSeTNdIOTy dSIIOlO- mer, is much simpler. On opening contact every second, the directing clock sends a current into an induc- tlon coil. which has an oscillator con nected with an antenna a few wards long. Receivers in different parts of the city take signals by sound or on the tape of a chromograph. Systemat- ic interruptions of the second Iis- charges indicate the minute. With the tad the time has been transmitted to dis tance of q mile and a quarter with an error of only two or three hundre1ths of a second: and with more elaborate arrangement 1t would be possible to charge the air with pulsations that could be converted into time beats by suitable receivers in any dwelling or any apartment in Paris and its sub urhs.
 Red light was shown by Finsen, the Danish physician, to have a decided in- fluence in fevers of certain kinds, es- pecially in lessening suppuration and other symptoms in smallpox. carry ing the apartments further, pr. Gold man, of Vienna, recently Vacclnated numbr of children In two groups, keeping one group In red light with red bands over the wounds, and the other group under the usual conditions. The results have been surprising. The children exposed to daylight had the usual swelling. inflammation. suppura- tion. etc. but in the others there was no development of pustules or inflam- nation. Dr. Goldman believes there was no lessening of the preventive power of the vaccination.
 Odors, either natural or artificial are given to flowers by French chemist. Fading flowers are restored by immersion in a weak solution Of chloride of ammonia, and are then sprayed with artificial perfume. TO reinforce natural odor, the flower IS placed in glass containing glycertne, and enclosed in box through which is sent a current of carbonic acid gas charged with the odOr of the flower.
 Under the fierce rays of the summer sun, the surface of the earth becomes very hot at midday, but the soil con ducts heat so slowly that al I depth or two feet the lowest temperature for the twenty-fou hours is not reached until about noon. while the greatest heat is at midnight A few inches lower down the daily temperature is