; of fam et we n eharcoa 
= eae fn mber | of the 
On the Secondary Spark. . 349 
hundred horse power seems to be the only mode of arriving at a 
definite conclusion upon this point. It is obvious that, prelimi- 
nary to such an undertaking, a great many experiments will be 
absolutely necessary ; and such only as one quite familiar with 
the difficulties of entering upon an entirely new. eld, of opera- 
tion can pepe appreciate. | 
Arr. XXXII.—Singular property, and  sehinordtieete size and 
length of the Secondary Spark ; by Prof. Cuas. G. Pace, M.D., 
Washington, D.C 
In experimenting with my great maghet a new property of the’ 
secondary spark has been discovered’ and some. very interesting 
facts elicited. I will. premise that the helix nearly a foot in diame- _ 
tereach way, when charged by the battery, draws up within it © 
" a Vertical position a huge bar of iron weighing 300 pounds, 
through a distance of ten inches, presenting by far the most power- » 
ful Magnet ever ‘known. When the circuit with the helix: is sud- 
y broken a secondary spark is produced; eight inches in length. 
eae he most Reranteng feature of this a is the modification 
én th 
merican Journal: 
Washington, D, ©, Aug. 27, 1850. 
World to enter oe ‘the benefits of the - iat fi kind past ae power 
cannot ry, or satis Ly Tea a er 
ther be — available for “locomotion or navigation,” 
Sacrifice of mind and mea ar ph rege to find that which eg py it tad be 
Secured by the: pr plan) d ‘ge exist... A point has been arrived 
his ae investigation which indiaten, to use the language of Professor Page, in 
4 “a sah to Congress, the import sce “1 carrying the thing “ beyond an un- 
T ave no doubt of the applicability and rape e04 (especially if we 
ife) of pcg 
* age purposes 
mak Congress in providing for the experiments DY tt the world may not yet be 
pc aq, and many vil be real have still to be made, and peoemlion — , expended 
am 
_power for ships, or that to his zeal and intelligence we are not in- 
introduction of what we now enjoy in the “— of steam na — 
