, 1873-09-25

thlCk over anoincT punk ot MI HCE thicK. h Tint
another, anu SO OH, until ntx TOR ogh!} nyo been
10 1,nsfc together, tho oH hovesang. and tho whofo
being Aftcrwarl bollcd firmly.
On tho I'd Of August. almost all tho briclk-work
waa built. or tho thirty-ono trussos fourteen
woro In position, whilo four moro woto ready for
erection. TAoy woro built On the floor Of tho
building and raisoa 10 their rlacoa hy six DOR
richB. ponderous "a thoy Ncrc, II took but half
IN hour to raiao ono to its p1acc, though tho
necessary preparations for that operation
took from o1ght to niuo hours. The
following Monday, notwithstanding tint rapid
progrcgs lad boon mado, a hundred moro mon
wero put on it, md tho work went forward with
rcdoubled spood, watchod, not only by tho
tho Executive Committee. who was constantly
on hand during working hours.
by tho 10th tho bnildiug Was nearly wholly
iuolosel, except ut tho o,ds, aud tho hu!f-trsses
ut tho south onl wero in placo. The glazing In
tho roof wns begun, md tho great smoko-cllim-
noy. Just northeast of tho building, WIS nonr1y
Finished From that timo up to tho present tho
work, chiefly interior, has gono on stendily
without interruption, and with but few acci-
dents.
NOTIFICATIONS OF pI.ASH.
Tho orfglLul plans Wure adhered to with but
slight notifications. Tho fllsL design was in tho
shape Of pnrallologram,. but it Has afterwards
changed by rounding of the corners at both
ends, mixing them soni-circular. This altera-
tion was admirable, sinco 1t permitted the con-
tinuatton Of the gallery around tho entire build
i1ig, gave al unbrolsvn akylight, aud au exterior
aud interior effect, which could lavo boon &C.
cured in no othor way. After the building had
was not tl1no to eloct porruanont
structure, tho Executive Committee was conn.,
pellod TO patch out hero and thele. and to mako
s1.t543o
the gallery WAS wit1oued out four feet ut cost
Of 81 100 and sheds were built at both ontlB for
agricultural machinery Of heavy kind. cach one
4J foot by 1G0. Additions wero also made ou
sitting-rooms, etc. These could DO made with
but lttlo additional expense, since the east wall
Of tile building waB Used. They. arc OIL either
eide Of tho art Hall, and ouch ono iB 240 feet in
length.
Tho cut showing tho western front OF tho
building, and tho two accompanying grouud-
p.ans will give better ttlea Of tio appearance
Of tho building, md the WY iu which il ia laid
convoy. But still there are some figures and
statements relativo to the details OF construc-
tion, which will bc Of general interest, aince
they Will aid to comprehend the aolidtty
Of tho massive structure, Upon tho pltes
lofty md rounded roof. There are Ut
main oueB and 10 half ones at cach end.
Thoso trusses arc supported each by four piles,
capped by oak tlmbors 12x14 inches thick ant
teet long. ACROSS these cap-Btlcks orc laid
four oak sMb-sills 12xl2 inches III thickness, aud,
like tho caps, feet in lougth. Placed side by
Rde Oh tho top Of these HtckH rest tue main Bis,
Which extend across tho building, supporting the
pluced at foot above the loor or 7 feet
above tho main sill. Tho main oneB arc Of LEO
foot span, feet thick, and II to II inchos wide,
and are n,ade Of ono and threo-quarter dlessod
pn!s plank, fastened with bolts and diagonal tie-
ruds, tho lower bong ii foot from tho floor. Tho
half trusses arc only 0 inches wide, but Of tho
came thicknesB and materials as tho main olos.
For tile tirnt 28 feet they arc built solid.
Tho oxterior wai!s OF tue tirat story nre Of
brick, q fect IN height and arc 15 feot outside
Of tho liue Of truBscs. Keeedlug from them is
ahed roof, touching tho spring Of the man roof,
which, for II feot aboyo tuRt point, IL made of
llnmtnered glass. Above TINT it III Of galvanized
iron.
MATERIALS USED.
Tho following ilgnreB give very closely tho
amounts uf the different klutla Of Matr1 used
though como Of them nallst be increased OWING
to tho later additions. Tho full lIgurcs Will be
evening: 1,71G, 600 bricks; 5000 0uu loot of lum-
ber 400 cubic feot Of stone $40 Hqparos Of
tin, each sluaro being ~ by 10 root; 1888
tons OF bolts, nuts, ard plates; 4,600 feet
Of galvanized iron conductor pipe; 7,0O0
feet OF glass III tho windows, 5,UU0 feet Of
sheet glass III the yantilators, and 27,200 feot Of
ribbed glass in the gky-lighta; in tho doors mud
offices there are ! ,0o0 feet additional Of glass.
There arc 900 feot Of Gaspipe in tho structure,
q half of which il worry large, some Of it being )
iuclles wide. There ID more large pipe in tlis
than III any osher building in the world.
THE CENTRE PROJECTION.
As haa been said, tho building is 300 feet long,
IN tue centro Of Tie Michigan aye1ro front Is
tho first projection, three stories high, 2D feet
clear Of the main wall, and 120 feet long. The
frat story has an altitude OF u foot.
the second 16, and the third II. Over
25 feet III height. In front Of this pro-
lection or portico is carriage drive 20 feet
wide, upon which open two largo entIance-doors.
Two double windows flank tho doors Oh eaoh
second story, 20 feet wide and 80 long. Frouoh
double windows open from tho second story
upon the balcony, which in turn is covered BY
handsome awning suspended from above the
windows Of the third story. Tho same descrip-
ton applies to each OF tho two othor projections,
Hituated near tho ends Of tho building, except
that they arc 90 by 80 feot in ground measure
ment, and three doors open upon tho carriage
drive in each case. instead OF two, in tho grand
portico.
THE WINDOWS AND Doors.
There arc 473 windows III tho building, 1G0 OF
which nre in the first story, or brick portion. OF
doors there aro 18. The two main doors are 10
fcot wide by,l4 feet high, with somi-oircular
tho doors in the ond projections are i feet wide,
and the ton doors in the sidos and ends Of the
building are 10 feet wide the height s uniform.
On the second story there are four doors opening
to tho balcony on the front portico those arc
tions thore arc two doora by u feet.
THE DoMEs,
Tho grand dome is just back Of tho Adams
street entrance and exactly In tho middle Of tho
roof. It is twclse-Hidod, 60 foot in tlianetor,
with 4Q faat refnn,slicunr hatvht nrtt a rat{;ua