i'];v\\i\<, \\i 



s are J hub thirk ami the butt straps ,';,, inch thick. 

 All other dimension* uiUHt W deduced from the tai 

 nvrti-il lap joints. 



EXERCISE 8. Tin connection )f tin. . |.l:r. riveted 



lap joints is shown in ti make the join; ilitehas 



a portion of its cd^e thinned out. und the plate abo\c it i.s M-I up at 

 tliis part so as to lie close to the for: 



Draw th< ws shown in ti^. < tn the same scale a 



last exercise. 



The plates are ,; inch thick. All other dimensions to be obt* 

 table for sinu'le riuted lap joints. 



\\'mu tjl,f 



lo illustrate the connection of plates which an- at riu'ht an<,'l< 

 ne an .; - a plan and el> 



lion of the corner of a \\rou^ f ht-iron tank. The sides of the tank 

 are rivet* (1 to a vertical angle iron, the cross sect ion of which i> 

 clearly shown in the plan. Another anu'h- iron of the MOM <lh. 

 sions is used in the same way to connect the sides with the bottom. 

 The sides do not come quite up to the corner of the vertical angle 

 iron, excepting at the bottom where the horizontal angle iron comes 

 in. At this point the vertical plates meet one another, and the 

 edge formed is rounded over to lit the interior of the bend ol 



i/.oiital angle iron so as to make the joint tight. Draw hah 



The dimensions are as follows: angle irons 2$ inches x '2A in< )i< s 

 x inch ; plates I inch thick; rivets j,' inch diameter and 2 inches 

 pitch. 



. 1(>: tinnstct S(<iy. In order that the flat ends of a 

 steam boiler may not 1>< Indeed out 1>\ the pressure of t 



are strengthened by means of sta form of boiler s 



called a * gusset stay, 1 is shown in fig. 8. This stay consists of a 

 >trip of wrought -iron plate which passes in a diagonal direction 

 from the flat end of the boiler to the cylindrical shell. One end of 

 this plate is placed between and riveted to two im^lc irons 

 which are riveted to the shell of the boiler. A similar arrange- 

 ment connects the other end of the stay plate to the flat end of the 

 boiler. In this example the stay or gusset plate is f of an inch 

 thick ; the angle irons are 4 inches broad and A inch thick, 

 rivets are 1 inch in diameter. The same figure also illustrates the 

 most common method of connecting the ends of a boiler to the 

 shell. The end plates &re flanged or bent over at right angles and 

 rive icd to the shell as shown. The radius of the inside curve at 

 the angle of the flange is 1| inches. Draw this example to a scale 

 of 8 inches to 1 foot. 



