SIMPSON, STRICKLAND A Co.. Ltd. Dartmouth * 



individuals tried pressures of 150 and aoo Ibs. years ago they did not 

 succeed, although MI. h pressures are in common UM now. So BO doubt m 

 the fuime pictures of ay> and 500 Ibs. will he general. In any ca* 

 press r 200 IDS. will |uadruple and quintuple 



engines for a tant gain to he 



special purposes, no doubt, special pressures should be used. 



\\ here, for instant r, m.. iu.irtv has to be placed in the hands of totally 



unskilled mm. it m.i\ sometimes be desirable oot to depart much from 



th.-v ii.i-..- l ! used to, and we shall be pleased to auote for 



y to suit. \\ heir there are special reasons lor it, we shall also be 



pleased to quote for specially high pressures. 



that the 



Relation of Pressure to 5 peed. An idea mriintr% 

 speed of a boat is in someway proportion.it. i. the pressure. We \\*\r 

 heard people rem.uk, on M-emu the photo of a high speed boat What a 



I i Vt _ - .-. f ~ 



tremendous pressure she must 



Now. a a matter of practice, the 



pressure a boat works at has very Intl. to do uith thr speed 

 The principal adv.. ng a reasonably high pressure is eo 



Imt we believe t)> : in speed i> obtained by raist 



pressures, and we sh.dl U- pir.tsrd to quote for hgh speed or other boat* to 

 IUTS' requirements, to \\oik at any pressure from 5olbs.tO4Oolbs. 



In ;on with this question of the relation of pre**ure to speed 



noting that <>n< ..I the fastest vessels afloat. M/. the Irish Mail boat, 

 In-land.' \\o:ks at 4|hs. pn-ssurr only, while she has a speed of a I knots. 

 On the other h.r me years the average working pressure of the 



ordinary * knot cargo boats has been 160 Ibs. to 180 Ibs. 





TUO. toft. 



>K BRAZILIAN GOVERNMENT 



18 



