180 KANSAS CITY REVIEW OF SCIENCE. 
MATERIAL. DIAMETERS. 
Water 298 Feet. 
Air 2841 " 
The Earth 171 " 
Hydrogen 6948 " 
Platinum 109 " 
From this, it may be seen that two globes of hydrogen of required mass 
could not have their centres one mile distant, as their surfaces would collide ; 
while the platinum balls would have plenty of room. And such is this myster- 
ious energy — attraction, of whose nature nothing is known. It is inherent in all 
matter, and since the spectroscope informs us that the stars are made up of 
materials like those in the Earth and Sun, we say the dominion of gravity is as 
wide as the universe. Because gravity tends to draw all separated masses to one 
common centre, the whole sidereal structure would collapse and form one solid 
mass in its centre gravity, were not attraction balanced by an opposing energy. 
Such power is the centrifugal tendency evolved by circular motion. Therefore, 
the sidereal heavens is either tending toward destruction, or is in regular revolu- 
tion about a centre. The deduction of late astronomy is that it is in rotation ; 
and even now, astronomers are almost ready to locate the centre in infinite space, 
which from the law of gravity may not contain matter, but is far more likely to 
be void. 
New Windsor, III., June 17, 1883. 
STORAGE BATTERIES. 
\^ReportofProf. Henry Morton on the Storage Batteries of the Electrical Fozver Storage Company, 
Limited, of London^ 
Having made a series of careful tests and measurements of the electrical stor- 
age batteries manufactured by the Electrical Power Storage Company, Limited, 
at their works at Millwall, London, England, I find the following results in refer- 
ence to their capacity to store and retain energy, afterwards delivered by them as 
electric current. 
In the first place as to the capacity of these batteries in thus storing electricity, 
and its relation to the weight and bulk of such battery or reservoir. 
The cells with which I have made my experiments are of the pattern called 
"one horse-power" cells, because they will contain, when fully charged, an 
amount of energy equal to fully 1,980,000 foot pounds, or one horse-power for 
one hour. 
These cells are externally rectangular wood boxes, twelve and a half inches 
high, eleven and a half inches wide and five and three-quarter inches thick. 
Two of them side by side, as they would stand when in use, occupy about 
one cubic foot of space. 
