386 BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 



rial framework of polished brass, and connects at one end 

 to the piston-rod, working through a steam-tight stuffing- 

 box, and attached by an arrangement giving parallel mo- 

 tion, or so as to move the rod in a right line, although the 

 end of the working beam moves in the arc of a circle. 

 To the other end is attached, by a moveable joint, the 

 connecting-rod, working the crank and fly-wheel, the 

 revolutions of which give uniformity to the motion of the 

 engine. On the main shaft, or axis of the fly-wheel, 

 there is an eccentric-wheel or pulley clasping around it, 

 the end of a rod which at the other end connects with an 

 arrangement of levers for moving"the sliding valves. As 

 the eccentric moves round, it draws the rod backward 

 and forward, and moving the valves at the proper time, 

 distributes the steam in the cylinder, thus giving motion 

 to the whole. The engine is made of brass, well and 

 neatly finished, and with the boiler, is mounted on a me- 

 tallic base, handsomely japanned to represent brick-work. 

 The engine is put in operation by pouring a half pint of 

 water into the boiler, by the opening at the safety-valve, 

 and applying the heat of the alcohol lamp, which, without 

 soiling the brass-work, will cause the engine to work with 

 great rapidity. Size, 22 inches long, 13 inches high. 



Price -$30.00. 

 Larger size, $50.00. 



Common School Apparatus, consisting of Juvenile In- 

 structor, Numeral Frame, Geometrical Forms, Arithmeti- 

 cal Solids, Geological Cabinet, Globe, Tellurion, Orrery, 

 Thermometer, &c., with directions for using each article. 



The above have been greatly improved in style, dura- 

 bility, &c., with many important additions. Out of the 

 many school-superintendents who have recommended the 

 above instruments, are a few whose names are subscribed 

 to the following certificate, who are well known in the 

 state of New York as competent judges : 



" This is to certify, that after a careful examination of the Scientific 

 School Apparatus, we can not refrain from expressing our decided 

 opinion, that its general introduction into our schools is of importance, 

 and would cheerfully recommend it to the community. The different 

 departments being well adapted to most of the branches pursued in 

 our common schools, Avill greatly facilitate the teachers, as well as the 

 pupils, in the pursuit of those branches it is so eminently calculated 

 to illustrate." 



