New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1871-09-19

firm Of which am member It is n our ya aWaV w
the Of the n nson sSS s sSa.
services Which have to perform, are these t id sPesed
standing subject to the order the Of
a to be spsnS Of Sn in
proposed to be used IN buildings an" on ees nnd
girders designed dt to sustain any given weight.
educated for the business and have stead NY
last eight years have been carefully making myself
familiar with the various authorities on tho strength OF
have partially in priut book on the subject OF the
requisite sections Of columns girders. beams &C., to
s onp any G gv'bn best
An idea Of the comprehcnsveness Of this work may he
$500 examples worked out from formula, to show the
sections of columns beams and Orders proposed to sus
of other information which it has required considerable
time to sptom,ze and supplement That any , of
great playing forces Of every iron BEAM column grdcr
i'll use, viz. compression tension, and tOreon, H. do
not hesitate to frankly announce, extremely doubtful
ure which is the test with only slxnch bearing at tho
half the bearing weight which the beam Is required TO-
sustain must be put on the center and it bears up at
which Is to be distributed over it.
Has your writer read Prof FAIRBANKS work on Iron
says that the breaking weight Of beam sustaining 10
20 tns disfiSued over the general surace civil I'm,
gineer b. Baker in his recently published comprehensive
says page S Orders designed for distributed loads
commonly tested by hydraulic pressure applied at the
center OF the span" In addition 1t is obvious, by sim
pie mathematical calculation that the pressure applied
the center OF beam or grder must be equal to double
load AGAIN. ssd that the e vr %FR
Co.'s Dictionary of Terms" communicates the fact that
used to goods
q e .Ss asst aepIisailons e to tie sstl"09 airde'
No one who has observed the opposition manifested in
past times, as well as the present to nsny Sau iae
OF the least patronized iron manufacturers mot exceed
ing eight IN humber, however, have associated them.
selves together to fight against the enforcement OF the
present IL approved and extended building law.
the relations Which bear as one Of the firm Of J. l..
Jackson & Bro through the Department Of Buildings
and Roy inspecOrshp, connectedly used to unduly
favor the hrm am constrained to brand the rumor as
nine Orders IN row of buildings on Ninhave. between
dered them down had them sent to lis place Of business
for test that the cost OF setting and resetng was be-
tween 800 and s50 and II took two weeks to complete
the test In all cases without the slightest exception
have TO promptly m everybody
gSn to 4 heir e s of bus sm three ss
eSdns 8 what e they clearly
dsaSs SS ny dy S ' POSSIBLE, FsRe'i s
sssss
1
Of ereetioR The tests have been made 50 for only dur
ing the last two months Az tho yard IN East Thirty
st-st, which MY calumniators have so cOnspcuOusly
published that hive great, profitable, personal inter-
est ill., $a0Aave been received during these two months
The Offset is $500 expenses In hs ratio the sum total
Of the test business would amount to $500 per annum
against $500 for the period leaving profit OF
$500 year, and not $500, as has beep ead am
makng The fact that there Is testing machine In the
yard in East Thirty arstst as has already been shown
Is not compel anybody To convey their productions
there TO be tested whatever brought comes because
the founders have not purchased machine for them
selves and find il more economical TO not have pig iron
piled upon article be tested in their establish
ment The records of these tests will form highly val
liable book, which win, no doubt be fu appreciated
by tho larger iron manufacturers whe1 Is published
cent" THE TRIBUNE Says AN architect present stated
that only the Of mason nediaely over
the girder, and contained in equittra triangle OF
which the girder the base, Will usually fall out when
\ the girder Is taken away"
This, win grant Iheasurahly So provided the wall
the in ole Of 90 buildings erected III this
city. 1t Is but proper, think in closing TINS reply TO
say that Mr. MacgeRor is not in way connected with
the firm OF j. L. Jackson Bro, and that oil the unchar-
aby rumors that he is sheer fabrcaons.
| PETER II. JACKSON.