Popular Science Monthly
��89
��and rear sets of wheels by means of a short driveshaft. The power is in turn trans- mitted through the gearbox by means of a silent chain drive to two shafts, one extend- ing forward from the front of the gearbox and the other aft from the rear side. Each of these shafts
PNEUMATIC TIRES AXLE™"
��two gears,
��carries worm
these meshing with large worm wheels and dif- ferentials mounted on supplementary axles which simply drive each pair of op- posite wheels, but do not sup- port any of the wheel load. Each
��the center. The separate lever serves to turn the vertical turn-bolt as the driver turns his hand-wheel to steer. Additional rods attached to one end of the two-armed bar lead to the front set of wheels, and other rods attached to the opposite end lead to each op- t "
��UNIVERSAL JOINTS
���SPINDLE ARMS EXTENDED MOTOR SHAFT MOTOR OFF CENTRE Diagram showing the driving and steering arrangement of the eight-wheel truck. All wheels turn for steering
��posite pair of the rear wheels. Thus as the turn-bolt is re- volved, causing the two-armed bar to revolve about its pivot, it makes the front truck wheels turn in one direction and the rear wheels, con- of the supplementary trolled from the opposite end, in the re- driving axles is divided into two parts on verse direction, thus giving a very short
each side, these parts being joined by means turning radius.
of universal joints so as to permit relative
motion between any of the wheels of each
truck, as when passing over road obstruc- tions, without binding any of the driving
members.
The motor must be placed rather
high so as to clearthe front
of the front truck. The top
the motor extends up into th
driver's cab and is covered
by a removable metal hood
The driver sits on one
side of the motor and the
helper on the other. This
construction permits the
driver's seat to be placed
well forward, which in
turn allows a longer
body on the same
length of chassis than
would be the case in
the usual construction
with the motor under a
hood out in front.
All of the wheels are
arranged to turn for steer
ing, this being accomplished
through one steering wheel
and column by attaching the
steering crank by means of a
rod to a vertical turn-bolt
carrying three arms. One of
these arms is a separate lever,
while the other two really
���comprise one bar pivoted at
��To Make Your Lawn Attractive You Must Edge It Evenly
AN improvement on the ordinary . lawn edger has been invented Christian L. Schneider, of Davenport, la. It not only dges the lawn neatly but cuts a trough at the same time at a regulated depth. The edger consists of a J-shaped knife carried on an arm which ad- justs it to any height. One of the wheels of the edger runs on the path surrounding the lawn, with its outer flange pressed against the asphalt so as to insure a straight line. The other wheel is ar- ranged so that it will keep parallel with the wheel on the path, whatever irregulari ties may occur in the lawn over which it travels. This makes it easy to push and insures a straight edge.
��ADJUSTABLE KNIFE
��The outer wheel presses against the edge of the path to insure a straight line. A trough is dug at the same time
�� �
