The Detroit times., 1911-02-23

proofng purposes shall be made OF
pure clay. well burned, with weUs
and hanges not less than AVE.
eighths m inch thick and with
rounded niiets at all internal inter-
such tile may be "hard burned"
porous" or 'semi-porous."
Sec. 4. STONE. Stone herein re-
ferred to Is good quality OF build
m ls @s Any other building stone
equally as strong and durable may
stone used In concrete for foun-
dations must be clean and free
broken to pass through a two 80
inch diameter ring. IL used in fire-
PROBING or floor construction the
stone shalt be broken for three
quarter "a inch rims.
lake. pit or bank sand free from
orEanic matter and clean and
Sec 6 LIME. Tho fresh burned
quicllino of commerce. or nrst
SEC. z. CEMENT. Any natural
cement which Is the product OF call
cination OF natural rock, AS the
Akron. Louisville or other ny
See PORTLAND CEMENT
The standard Portland cement OF
commerce, either domestic or for
eign. which when tested neat. after
one I'D day spent In air, shall be
capable OF sustaining without rup-
ture. a tensile stress or two hum
dred t200) pounds per square inch,
and after one I'D day I'm air and
six Co days I'm water. be capable or
sustaining without rupture TEN
SIZE stress OF ave hundred (5oo)
pounds per square inch.
For firRnrOnfinR or floor COnStruC-
ton, tho highest grades OF Port
land cement shall be used. IL SHAH
be OF uniform consistency ana OF
such ineness that not more than
ten i10) per cent will be rejected
by n sieve OF twenty-five thousand
(25,00a) meshes per square inch.
and In addition II shall be capable
or sustaining without rupture
tensile stress OF at least SIX num-
dred 5000 pounds per. square men
after one 0J day In air and TWEEN,
ty-seyen (e7) days in water. and
all. cement shall be subjected TO
such other physical or chemical
tests as may be required In TINS
Sec .. MoRTARs. tA) Lime
mortar shall be made from one Cd
part fresh lime and not more than
Four (i) parts OF sand.
made from one u) part cement
and not more than three CD parts
tcJ Cement and lime mortar
shall be made with equal parts OF
cement and lime, and not more
than three (3) parts OF sand 20
each whole part of cement ana
line.
Sec. 10. PROPORTIONS OF
CONCRETE. The proportions OF
materials for concrete used In
footings. foundations, walls and re-
tanning walls shall be as follows:
Not less than one part or cement
10 three CD parts OF sand, and i've
(5) parts OF either broken stone.
sfag or gravel. TO be Thoroughly
mixed with the proper proportions
In quantities of over nfty (5O)
cubic yards, the concrete Is IN De
machine mixed.
All concrete shall be used imme-
diately after mixing. and the ma
terials shall be mixed By measure.
Sec. IL. PORTLAND CEIENf
BRICKS. Portland cement bricks
made OF Portland cement of the
sume dimensions as common brick,
may be substituted, except COR
walls. piers and buttresses sustain.
ing heavy weights. provided SAID
form to the tests for materials pre-
scribed In this Ordinance.
Sec. IT, ARTIFICIAL STONE.
Artificial stone made of Portland
cement and incombustible and
waterproof material. may be used
as a substitute for any natural
stone. But no artificial stone con-
tanning more than fifteen Gb) per
cent OF lime or crushed limestone,
shall be used as a Intel or bearing
part OF any building over four co
ArtirsIai stone must conform to
the testa for materials prescribed
In this Ordinance.
Sec. Is. WROUGHT IRON. All
wrought iron shall be hbrous.
seasr a and SSSins Ultimate tsn
sile strength OF not less than
forty-cight thousand (iS,O0OD
pounds per square inch with a
yield point or commercial elastic
0eo) pounds and an elongation OF
eighteen t1S per cent In eight (sD
inches, including fracture when
tested I'm small specimens.
Sec. IL; CAST IRON: Eycept,
free from Injurious cold shuts or
blow holes, true to pattern and
having nm ultimate tensile strength
OF not less than sixteen thousand
us.ooo) pounds per square inch.
square. cast from the same heat OF
metal I'm sand moulds. shall be
capable OF sustaining on clear
span OF four t4) feet and eight (S)
inches. a center load OF FIVE hun
bred (t0o) pounds when tested In
the rough bar.
See. 10. STEEL CASTINGS. steel
castings shall be made by the open
hearth or crucible process and shall
be free from injuries, and blow
holes and shall have the following
minimum requirements:
All steel castings shall be an
ncaled.
Sample bars to develop at least
an ultimate strength OF seventy
thousand (70.G00) pounds per
square inch, with yield point or
commercial elastic limit OF thirty
one thousand five hundred (31 5000
pounds per square inch and an
eiongation OF eighteen us) per
cent I'm two CD inches. including
fracture and a reduction OF twenty
i've (25) per cent in area.
Sec. 1s. STRUCTURAL Steel.
All structural steel including rivets,
shall have their physical and chem
ical properties In accordance with
the Manufacturers, Standard steel
Specifications, as revised TO Febru-
airy s, 1908. and as found In the
hand books OF steel manufacturers.
Sec IL. TESTS. The Depart
ment OF Buildings may require, At
any time, certified copies OF full
for any or all materials used In
buildings OF Types I and 2 and no
such materials shall be concealed
or built upon. until the Depart
snent Of Buildings, upon their re-
auest. shall have been furnished
with satisfactory proof that such
materials and workmanship are
fully equal to the standard
Sec. IS. NEW MATERIALS. Be-
fore any new materials not here
tofore employed are used as con-
structional parts of buildings or
structures, permission must be OBJ
tained from the Department OF
buildings. who shall apply such
tests TO the said new materials as
NAV be necessary to determine the