The Brookings register. [volume] (Brookings, Brookings County, S.D.) 1903-1971, 1915-05-06

speeds is the result Of weak magnets.
be recharged.
What are the respective advantages
and Disadvantages Of the 7 head INK
L head types of motors?
The T head motor, because its valves
are located on opposite sides, allows of
the use Of large valves, and hence more
power is obtainable than In the L head
variety, other things, Of course, being
equal. 1t Is usually more costly to con-
struct than the L head type and has a
more symmetrical appearance. The
T head, however, is heavier and more
complicated than the l. head design,
the latter using only n cam shaft and
having the valves all on one side.
What are the advantages and dis
advantages of tho valve In tho head
motor7
The chief advantage claimed for the
valve In the head motor is that, for a
given size, 1t has more power than an
L head or T head, because Of the fact
that larger valves may be used and
the combustion chamber given a more
spherical shape. There are a number
Of manufacturing advantages, n of
which is that the entire combustion
chamber may be machined and given a
high polish, thus preventing, to a great
extent. the accumulation of carbon.
The loss Of heat through the cylin-
der walls Of a motor depends to a great
extent upon the surface of the walls.
and In a properly designed valve In the
head motor this wall area is small,
compared with that Of another type Of
motor Of the same size. This reduc-
ton OF wall area Is obtained because
Of the absence Of valve pockets.
The main disadvantage Of the valve
In the head motor, especially one using
valve cages, Is that the valve seats can.
not be cooled as effectively as IL the
seat were a part of the casting. This
is true In the cage construction, be-
cause the heat, In order to get from
the valve seat to the water jacket,
must overcome the resistance Of the
joint between the cage and the cylin-
der casting. This lack Of cooling would
not materially affect the inlet valves,
as they are kept comparatively cool by
the incoming gas, but 1t would mean
more valve grinding In the case Of the
exhaust valves.
10 Il possible to maintain pressure In
q rear fuel tank when the tank cap 10
mIssins7
In cases Of this sort take an old IN
ner tube, cut out a piece about eight or
ten inches long, tie one end tightly, 30
as to be air tight, then insert the tied
end into the tank. Next remove the
valve connection from the pump, in
sert the hose In the open end Of the
tube and pump until the tube com
pletely fills the hole IN the tank. Then
tie the outer end securely. This con-
trivance will hold several pounds pres
sure in the tank and will last for some
time.
10 three sighths Of an lnoh too much
p'ey w. ~ WEEok pm b6DtisUH
Three-eighths Of an inch Is entirely
too much play for the wrist pin BUSH
ing, assuming that up and down play
Ii meant. There should be 30 little
play that 1t cannot be felt by a move
ment Of the wrist pin.
Can I siIvsrixs glass rsfsotorsf u
90, what arc the ingrsdisnts and In
what proportions are they ussdf
An amateur a ~silverize r~eflectors,
but It Is very difficult to make q good
Job Of It The method by which this
work has been carried out IL as fol-
lows: First fasten to a block Of wood
the finest possible grade Of emery
cloth. With this the reflector is
smoothed down to q flne finish. It Is
next necessary to have q melting pot
and a Thermometers which IL capable
Of measuring more than PIP degrees.
Two ounces Of lead, two ounces Of tin
and four ounces Of chemically pure
bismuth are melted together. Eight
ounces Of mercury are added at 212
degrees r. and mixed with the melted
mixture. This II applied while warm
with q smooth camel's hair brush.
Which Will give the bstter results,
% or ~ test oasolinsf
Az between 60 and "A test gasoline.
the 60 test fuel has been found to give
the best results II far a. mileage b
concerned. The gasoline which We set
nowadays h much heavier than that
on the market. say. lve or ten years
ago,
Can IN expsrt oaln any advantage
~ channino from automatic 20 hand
eentrol n : hattsry isnttlen systsmf
A skiIled driver might set better 10
sults With 4 hand control Of the
spark than could b. Obtained with
~ automatic type Of ignition control
for ~ reason that grnde climbing can
B. accomplishe1 much easier and ths
IIca6v e ~ me1os conafdsEed. IA 9th
r uuudoL ~ 6xlver cen shin III
unrk ; - ren1 aHd mctor condi-
*~W&-LI "-X* ~ #HN. $500 n-R--k|LAAA-