MECHANICS AND USEFUL ARTS. 55 



without the addition of levers, and the weights are securely locked in 

 the pillar to prevent alteration. 



MAMMOTH LOCOMOTIVE. 



A MAMMOTH locomotive has recently been built for the Camden 

 and Amboy Railroad, weighing 30 tons, and of 350 horse power. The 

 Railway Times gives an account of the mechanical peculiarities of 

 this engine, as follows : This engine differs from other locomotives in 

 several particulars. The first is, the manner in which the motive 

 power is communicated to the wheels, namely, by connecting the cross- 

 head by a rod, with a pendulum, or long lever suspended from a shaft, 

 supported by pedestals fixed on top of the boiler. This lever, vibra- 

 ting, gives a very slight angle to the first connection rod, and conse- 

 quently occasions very little friction, between the cross-head and 

 guide. The main connection takes hold with a fork, at the lower 

 extremity of the first connection, and passes back to a wrist in the 

 third pair of wheels ; from this passes another connection rod to the 

 fourth or rear wheels - - then to complete the arrangement forward, 

 the third pair of wheels has fixed on the centre of the axle, a spur 

 gear, communicating through an intermediate wheel to another fixed 

 on the axle of the second pair or rear truck wheels ; these wheels are 

 connected by side rods to the front truck wheels, making the whole 

 eight wheels, or four pairs, driving wheels. Another striking pecu- 

 liarity of this engine is the manner of heating the water before it 

 enters the boiler. In the first place, the tank is connected by hose to 

 the ash pan, which is made with a double bottom, so as to form a space 

 of three inches between the sheets, to contain water ; from this the 

 water passes through an internal pipe, enclosed by the exhaust pipe ; 

 thence to the smoke-box, where it passes out to the pumps, which are 

 vertical, and fixed on the outside of the smoke-box, and worked from 

 an arm fixed on the pendulum shaft ; by this arrangement the water 

 is heated to nearly the boiling point before it enters the boiler. 



The engine is calculated for freight trains, having wheels only four 

 feet in diameter. The boiler is 24 feet in length, and 50 inches in 

 diameter, tapering each way, forming a line on the bottom. The fur- 

 nace is 47 inches wide and 7 feet long, having a bridge 12 inches 

 from the tube sheet. 



/ 



IMPROVEMENTS IX LOCOMOTIVES. 



MESSES. REMSEX, and HUTTOX, of Troy, N. Y., have taken 

 measures to secure a patent for improvements in Locomotives. The 

 steam is admitted to the cylinders on one side of the pistons only, so 

 that the cylinders are single-acting the piston rod only acts upon 

 the crank and driving-wheel during one half of the revolution, and 

 that while the crank pin is above the axis. To insure a constant 

 application of power, three cylinders are employed, with their pistons 

 acting upon cranks placed at an angle of 120, to each other. Each 

 6 



