The Minneapolis journal. [volume] (Minneapolis, Minn.) 1888-1939, 1902-11-08

Il until Figuring more brain exeruon
F{BH dishwashing does to the average housewife
EsGS That is this first thing For the second
there others
instance, bridge builder must know how to draw
designs like must be familiar with chem
stry soils and certain atmospheres ace
upon metals wood the qualities OF the materials In
how strong the iron Is just no" hucn
allowance make for its contraction and expansion
in the the bridge is to be erected as wen
rs wind force added burden IL Is sos ~
be able to Withstand
hult by Minneapolis bridge When the city de-
cided to have it, civil engineer drew what is ceo
a. profle" that had to be spanned mat Is IN
his drawing stood in the ravne and drew the
lines either side well as the ground me
of the This showed just what natural the
builders the bridge would have TO consloer III id.s
their plans what u.s. whether earth shattered rock
sha1e etc. For these plans circumstances AFTER
cases to most notable degree bridge that would be all
right for the traffic and nature in the Second
be wholly say for odge over
the Gardiner river in Yellowstone park winch en's
same company has been building recently.
This profile plan having been drawn it is sent to the
great bridge building companies in the country with re-
quests bids For in such work the contract goes
the who guarantees the best work 1or ne lowest
The receipt of such profile Immediately makes the
Offices OF bridge building very busy place The
chief engineer OF the company to figure out
his "estimates,"that s first what kind OF or1dse WI"
best in the conditions. how much metal Will nave
to be the load specified by the en-
sneer who profile" how PIERS any, are
: needed and details OF the same SORT
to figure what shape the supports will have to be-
what kind joints win best support the weight what
amount be required for the walks how much
stone or will be needed in the ands
there is more figuring to come .
The chief engineer making estimates which ought
- mean work for his firm close enough
is even now only fairly started in his Figuring OUT He
must will cost to transport his material TO the
bridge ste will cost to get hts wormen and teams
there and board going to COST and
above ALL the time in which the work can be
DONE Usually contracts there is forfeit for any
spent the work above the contract time This often
amounts to a large Of which has to be paid
by the they have failed to get their work
done within the time they promised
When this work has been the chief engineer,
his nans go to dTaughsmen employed by
the company the profile of the ravne from
the original Then reading his chief engineers spec
cations begins bridge over the raVne he
shows lust where foundations will be- if there is call
for more arch specifies just what material
will be- whether Of concrete or metal ana MS craving
must be made exacness that he shows only the
number of supports that will appear in the
completed structure
f1e cannot say about so many" Bridge building is
most exact Everything must fit There can be no
niecng for where for strength
would be fatal weaken it by patch On the haWess-
ness Of these there hang many lives Ii cal
cations have made within one-sx-fourth OF an
inch if the together in the right
way-and that there is only that will
be safe tiniest in the calcula-
tons as strength the bridge will be faulty
and will expected strain Perhaps this
will be shown at time when loss OF life would be
great
Aside from this drawing Of bridge completed
form with every marked to its dimensions
the margin, showing perhaps
considered best for special place,
or rvets ETC. When all this IS the
nlan is photographed the drawing coming out with blue
BACKGROUND the lines in white This blue print with
the estimates time it will take to construct
the bridge ETC., asking bids
the stated with the and the choice
=
The making of such plan and estimates is
matter nor is quickly done. plans
estimates the bridge the Middle Gardiner
previously mentioned, took skilled
at thatexactly week to make working eight hours
day. %.&.~.
When contract is finally awarded to firm the work
on the plan practically has to be all again.
fact the real work has only begun Another
ing must made the first and this must
the most details The first drawing gave merely
pieces Of metal to be used in the proposed