— 189 — 
the 
ii • 
11 col，l， öspontling positions on tlie elevation. Then arrange the chord packing on 
s i(le of the plau so as to make the bending-moments on the pins as small as 
possible without having any of the chord bars puli afc too great an angle with the 
1)lane onhe truss. 
It any of tho panels liave trussed bars, tlie trussing should be here slioww, and 
spacing of the rivet holes for same in the chord bars should be represented close 
10 P! an of tlie trussed bars. If there be a bottom chord strut, it should bo repre- 
e nted in elevation alongside tlie plau of the packing. 
the. ^ eai * が此 slionkl be drawn separate views of the lower chord pins : giving 
r milü her, diameter, lengths between shoulders, diameters and lengths of reduced 
(， s ’ and the total lengths ; also the sizes of tlie nuts. At the rig] it lmnd end of tlie 
仏。 1 】 1 g s ho'v tho floor system proper for one panel length in plan and elevation, 
^ a 封 001 . beam and a track-stringer each in two or three views, with tlie sliims 
i eu’ attachment to tho stringers. Generally ihe floor beams will bo all alike 
^ yjiunetrical about the central longitudinal vertical plane of the bridge, &o it 
e sumcieut to represent half a beam. The bearing for an end stringer should 
6 COm pletely delineated. 
1 ° ne l la lf of the plan show tlie lower lateral struts and rods attached to the 
th * C 101 (飞 an d ano thei， view of each alongside, not forgetting to properly represent 
au d on the other half of tlie plan show the upper lateral struts and 
l Gö S . aü( ^ portal bracing each in two views with all tlie details near by. Half 
^uir ä ar ° g euera lly sufficient for these struts and rods, but if full lengths be re- 
〇 can be represented l>y moving the panel points of the lower half of the 
n ^ alf a l) a uel length to the right. 
t レ a e 又 . wa s prepared by the above method, but was afterwards traced from 
than ma ^ into a more compact form. The scale of 香 " = 1/ used is smaller 
Cause ; ou ^ be employed in practice. This is both for economy of spaoo ami be- 
chapter 0 c | raw ^ n S 8 were prepared for a model of tlie bridge designed in the last 
It 对邮 1 パ 1 U 山 6 latter reason there are no details drawn on an enlarged scale. 
贫 oi.ki author’s intention to illustrate on this and succeeding plates all the 
doj nfy ^ Evings ior the model of the bridge, but lie lias been prevented from so 
も ie unU8Ua ^y large estimate for printing this memoir. The complete 
of Can ゎ 6 seen at any time in the rooms of the Civil Engineering Department 
な oluo Daigaku. 
Which ^ で 1 dimensions, e<) 0 ， upon a working- drawing, it is immaterial from 
any U v ° 1〇 ^ waiting be read ; that is, it may be read sidewise, upside down, or 
Matter Uec ^ on most convenient to tlie draughtsman. In making tracings, this 
tiu. ei . I an 1，ec tifiecl if it be thought advisablo. Full directions for the mauufac- 
列: 二 “ e on tlie drawing. 
]10 t ろ tliG list of members, ami go carefully over tlie drawing with it ; 
llie nts * ° U ^ T “加 eac li piece is represented, but that there are sufficient measure- 
レ ? lave ^ man ufactured. 
炊 011 1) of •ヲ l 0Wlll g additional directions and hints may be found useful. Refer each 
^vets to some local line, which is itself referred to the end of tlie piece, or 
