The mirror. (Stillwater, Minn.) 1894-1925, 1918-01-24

OFF salt is sprnked sidewalk the ice
will melt. Whyl SIN
A:Because salt is Microscopic; u.s. because has
affinity for water Mixture of salt and will remain liquid
at 80 and lower. day Temperature below freezing
point of brine) salt will ice to melt.
Q:-Why does it frost the valleys than on the
nils! "A. T. G.
A;Because cold air, which comparatively heavy settles
In the valleys that the drops freezing
point there while remains above freezing higher attitudes
Usually also the air in the valley quiet than the air
above and this favors formation of frost.
o:-Please inform me as to location, area population,
products etc., of the island of Lemnos. -PW
A:-Most northerly of Grecan archipelago midway be-
tween Mt A,hos and the Helespon about 100 square
miles, Soil generally FERTILE principal crops being cereals
wines, fruits and tobacco. Lemnan earth, soft aluminium
scae resulting from the decay of fedpahc rocks
been used to some in medicine, first this
island Inhabited mainly by Greeks but Turkish author
ty since 1857. Population about 80, 900.
o:-Was Robinson Cusoe in Daniel Defoes story real
characterf III. r. E.
A:The main idea of Defoes story derived from ex-
periences of Alexander Sekk Scotch adventure who
early of the 18th century ashore island
Juan Fernandez following quarrel with commander of ship
which ne was engaged He lived the island
solitude for than four years. ekng living pro-
viding clothing and shelter for himself with nothing begin
with few bare necessities including gun some
ammunition.
O:-Wha are the definitions for the following electrical
units Watt, Horsepower and Ohm? Ell
A:The watt is the unit expressing electrical energy,
horsepower (H P represents energy in mechanics. 1t the
of the volt (preure) times ampee ate AoY Thus
volts times would give you Electrical
is sold much hour generally
hOur-
This represent for 1000 Or say 1000
for hour 746 equal horsepower nvesey
kilowau (kw) is equal to II horsepower.
The horsepower represents the energy required lift
weight of 80, 900 pounds foot in minute $50 pounds
foot in l second.
The ohm is the unit of electrical resistance and represents
the physical property which offers resistance
the flow OF electricity permitting just flow at
volt of For example: 1000 feet copper wire
gauge has just ohm of resistance and allows the flow of
ampere at volt.
OILS the when superheated effective for
power than the saturated what is the real of
advantage of experimenting? Is the expansive energy greater
after cutoff takes placer Why engines improved
by peheag that oentmes keeps them from going the
scrap pile for severaryears? &C. E. D.
A:-According same very reliable reports on the ex-
pansve energy both kinds very little differ
The main point of advantage of supehesng may
said lie in the increase of volume causes pac
cay increasing the supply cylinders just larger
boiler would, but with much less expense.
In this way engines that will make enough for
the work required of limited boiler capacity,
being ovecyndered they be given lease of
life also engines which has slightly
been reduced by direction, age
boiler be used good advantage often by superheatng
for though the starting would be weaker, the initial
cylinder pressure would after engine under way possibly
be almost wholly restored AS already stated the expansive
force might be different but from the of
heated steam. its lghness and lesser friction
passages, would exhaust freely and less back
pressure than saturated