CHAPTER XIV. 
PROPORTIONING OF OTHER DETAILS. 
• The sizes of stay plates used at the ends of systems of latticing or Rouble -riveted 
^ a °ing are given in Table XXfL and the sizes of those used afc the ends of systems 
0 f single-riveted laciug, in Table XXIII. The headings of these tables fully explain 
their use. 
Stay plates are to be employed at the middle of posts (see PI. IX, Fig. 8) 
the (Vuigoruils are halved, and connocfcetl by pins passing through the posts ; 
their sizes being taken from the before- mentioned tables. Stay plates, it* they can be 
8 ぐ called, are also to be used on the lower porfcal struts, for the purpose of attaching 
the k nee braces. 
Kn bearings are sometimes figarecl, conn ting in both ro- enforcing plates cind 
' Ve 】〕 ； but tlio latter is often omitted. This would be necessary when the holes in the web 
are boi’ed independently of those iu the re-enforcing plates, for then it is very im- 
P lob able that the different holes will coincide ; but, wlieu the re- on forcing plates are 
^veted to the web before boring, such a precaution is not only unnecessary, but is ft 
卿 ste of material. 
ヤ consulting Table XVI. can be found afc a glance, accurately enough for all 
Practical purposes, the thickness of web of any Union Iron- Mills channel bar, when 
le We ight is given, or I'ice versa. 
here ro- enforcing plates act also as splice plates, tliero bIiouUI bo when pi’ac- 
e one on each side of the web in order fco insure a good, substantial joint. 
, The length of a simple re-enforcing pLiie depends upon tlio number of rivets 
^^uired, and is thus determined. Find, by dividing the stress given on the diagram 
^ Miesses between the various thiclcnesses of iron which constitute the bearings, the 
^nioiint 0 f stress which the plate considered is to carry. It is well, though, to make 
1 レ 61 ，】 a l】 owance ， sa y twenty per cent, for the possibility tliafc the stress may not 
1 :' 1 e( l Proportionately to the thicknesses. Next multipl 3 r the stress so oLtaineil 
’ le P er P e nilicular distance between the central plane of the re-enforcing plate and 
