I BO Baron Nyevelt on New Electro-magnetic Phenomena. 
posed to live to a great age. Children, it is well known, fre- 
quently inherit the constitutions and diseases of their parents. 
Many persons, who have attained to extreme old age, were bom 
of parents who were themselves long livers ; which renders it 
highly probable, that longevity is in a great degree hereditary. 
The next circumstances, most conducive to health and long life,, 
are plain wholesome diet, temperance, warm clothing, and regu- 
lar exercise in the open air. Very few persons who are iiatem- 
perate and irregular, or lead an idle and sedentary life, possess 
good health, or ever attain to advanced years, 
Carlisle, > 
May 1823. j 
Art. XX. — Notice respecting some New Electro-magnetic Phe- 
nomena. By Major-General Baron Van Zuylen Van 
Nyevelt 
In a former number (Vol. IX. p. 167.), we have laid before our 
readers an account of the Electro-magnetic Experiments made 
by Baron Van Nyevelt, Professor Moll, &c. In pursuing this 
inquiry, the first of these philosophers has found that he can 
produce very decided effects on the inclination or dip of the 
magnetic needle, by means of the simple apparatus which we 
have already described *f*. 
In order to produce this effect, the strips of metal, instead of 
being placed the one above the other, as in the experiments al- 
ready referred to, are placed the one alongside of the other, but 
at such a distance as to leave sufficient room for the dipping- 
needle to be placed between them. In order that the electro- 
magnetic action may be the same throughout the whole length 
of the needle, the strips of metal are placed on the angle of in- 
clination, by placing the whole apparatus in the direction of the 
magnetic meridian. 
“With this apparatus Baron Van Nyevelt obtained the results 
given in the following Table. 
* Abrid/^ed and translated' from the Bibliotheque Universelle, August 1823, 
p. 274. 
"j* See Vol. IX. of this Journal, Plate IV. Fig. 7— Id, 
