218 OF EQUALIZING THE MOTION OF A STEAM ENGINE. 



Improvement in Allow me. Sir, to take advantage of this opportunity to 

 the lyphcm, communicate what I believe to be an improvement of the 

 fyphon. It was made at the time I had an idea of applying 

 the principles of a fyphon to the worm tub; AUbough it may 

 not be applicable to this purpofe, it will be found exceedingly 

 ufeful in cafes where it would be dlfagreeable, dangerous, or 

 irapoffible, to exhaufi the fyphon by the coa)mon mode of 

 fucking out the air, if I may be allowed fuch an exprefCon, 

 I think it even probable that fyphons of confiderable dimen- 

 iions may be introduced for emptying ponds, or for lowering 

 |he water in mill-dams or canals; for it is without doubt de- 

 jGrable to avoid cutting through an emhankinent, and a very 

 large inftrument of the new conftruction would be thus put in 

 action with great eafe. The improvement. Sir, I have thus 

 ventured to fpeak of confifls merely in enlarging the exhauft- 

 ir>g pipe to the fame calibre as the reft of the fyphon j in ele- 

 vating it a little, and in opening its moathlike a funnel. See 

 Fig. 3. Plate XI. 



It is fcarcely neceffary to point out that, to ufe fuch a fy- 

 phon, the ftiort arm is, asufual, to be immerfed in the liquor 

 intended to be operated upon, and the aperture of the long 

 arm to be clofed whilft the whole inftrument is to be filled 

 through the funnel with forcie of the fame licpor. 

 I am, 

 SIR, 



Your obedient humble fervant, 

 EDWARD HOWARD. 



XIII. 



A Method of equalizing the Motion of a Stetuu Engine zvithoiit tlis 

 Jljfiftunce of a Fly Wheel. By Mr. Ar'i'huu Woolf, £»- 

 gineer. Communicated by the Jnvenim: 



Equalizing me. JL HE mechanifm here prefented as a fubfiitute for the f?y, 

 aiw's'^die'lngine po^effes the advantage of equalizing the motion, with the 

 to fet off or flop power of being flopped and fet to work at any part of the 

 '" 7/ k*" °^ firoke, the utility of which, in mines, collieries, and other 



works, will be immediately fe?n by thofe converfant in fuch 



undertakings, 



Fkta 



