Show interesting experiment it has been discovered by jacien tine research rea rem earch that the magnetic needle ia is quito quite as sure an indicator odthe condition of the sun as storms or telescopic tele observe observations tion 1 thero there should be magnetic needle nee Jle observers throughout the country the rochester democrat thinks with the conjecture that they will appear in time irwill it will be found the most interesting study ever entered upon wo we would advise all to provide themselves with a large magnetic needle if ob carvers do not care to obtain any thing too elaborate an old 0 fd file that ia is not too heavy eay say f fourteen inches long may be employed empl the cutting portion may be ground off if it can be done conveniently the pointed end for attaching to the handle may be bo broken off up to the point where the cutting pors por tion begins thie this file should be thoroughly magnetized and BUS sus in A box turned on its side the open bide side being covered with a glass although this ie is not necessary ces sary A K tube of bran or a long wooden box ay pay tw twelve el ve or fourteen inches long can be cwi fastened on the top of the box oyer over the etor of motion of the A and through this the thread for suspending or balancing the needle should run loosely twisted silk isI best as as there is little torsion the string ia is made quito quite long lorig to avoid torsion the point of sui sus pension shoud nearly correspond with the middle odthe of the file the box with the needle a should hould be placed where it is not subject td jarring it an aron a rod is placed I 1 1 n a perpendicular PO position to the right or left 0 of f one of tho the poles of the needle the nee die may respond more readily to the earth currents the rod of soft iron ton has polarity acted upon by tho the earth currents and becomes an all electric magnet wai wien en the earth currents are strong it attracts the pole of the needle strongly and when the current falls releases it the rod is not necessary but its ordinary attraction is a constant force f orce only the changes in the earth currents can change its 0 attraction iron in the vicinity of the needle should not be disturbed and iron articles should not be carried near it A small glass mirror say ay a half inch in diameter may be cemented upon the center of the flat needle so motion may be detected by the shifting of the image of a distant object reflected from the mirror to the eye it will be interesting to watch the behavior of a heavy needle as above described before and during an advancing storm great disturbance may be seen in the needle for several days before a storm approaches the place of observation there will be regular motions of the needles at sun rise at the time the sun crosses the magnetic meridian and at sunset observation will show what are usual and unusual motions if proper precautions are taken until the habits of the needle are observed for some time there is da danger 1 ger of false alarms |