PKESIDI':\'l lAL AI)l)Ri:SS — SlATloX A. 



59 



The (levelopnicnt since 1850 and present position with regard 

 to the various heat en_^ines is seen in Vv^. 31. taken from Mr. 

 lliller's paper referred to. The di\ ersj^inji;- hne indicates the 

 increase and decrease in use. 



Fjg. ,^[. — Hlustratiiig llit- altcratidii of t_vpcs of new c'nj>incs installed for 

 power production en land in the I'niied Kiniidon-.. 



It is impossible here to trace the develoi)ment of the gas 

 engine. l)nt the hgin"es show : — 



(i) Otto's engine of J876 of ahotit 6 h.]). (Fig. ^2). 



(2) Engines of several thousands of h.p. using ])last furnace 

 gas. 



(3) Two engines of i.ooo h.p. each for the ])ower and 



Hghting suppl}- of the town of Accrington (Fig. 34). 



1m(,. .^j. — Otto lui^ine ( icS;6). 



Ihe vertical single acting type shown in Fig. 34 is made 

 uj) to 3,000 h.j).. and there is at the present day a tendency to 

 develop on the lines of the vertical high speed gas engine type. 

 The largest gas engine at work is about 6.000 h.p., but this is 



