Jffrrirl- Jt-^m-u'. 

 A/iiA'ers. 



-D B 



Figure 12. — Merrick & Agnew fire engine, showing vertical 

 pump arrangement and folding handles at the lever-ends, after 

 Patrick Lyon's designs. In "Fig. 2" the surge tank (f) is 

 located between the two pump cylinders. "Fig. 4" shows the 

 flanged swivel joints mentioned by Sellers. A single-bolt 

 variation of this joint is shown in figure 8 (p. 10). From John 

 Nicholson, The Operative Mechanic and British Machinist, 2d 

 American ed. from 3d London ed., 2 vols (Philadelphia, 1831), 

 vol. 1, opposite p. 284. 



19 



