SOME RECENT IMPROVEMENTS IN THE MECHANIC ARTS. 121 



Still persevere, ye toiling throng ! 



But know, the strength for which you long, 



Is safe in Wisdom's power ! 

 You glean but fragments, while the pure 4 



Discern this truth, eternal ! sure ! 



With Justice dwelleth Power ! 



Into this central truth doth fate 

 Make every purpose gravitate. 



And work for good alone ; 

 Far, far beyond man's feeble will 

 Abides a Power that guideth still — 



Unmeasurable, unknown ! 



Each selfish thought, by law, must tend 

 Unto the universal end, 



And for the common weal ; 

 Dependencies with power increase, 

 And thus all tyranny must cease 



When other's ills we feel. 



Hope on ! for Time will lift Death's veil, 

 And solve life's problem, though men fail ; 



And might and right unite; 

 We're building higher than we know. 

 And safe are we, where'er we go. 



Throughout the infinite. 



Kansas City, March 27th, 1882. 



SOME RECENT IMPROVEMENTS IN THE MECHANIC ARTS. 



BY F. B. BROCK, WASHINGTON, D. C. 



Telephone Mouth-Piece — This improved telephone is provided with the 

 usual diaphragm, A magnet in the shape of a split ring is bolted to the casing, 

 the ends of the split ring constituting the poles of the magnet. Upon one end 

 of this magnet is wound a helix looped into the main telephone wire in the usual 

 way. The other pole carries an arm resting in contact with the diaphragm. It 

 is asserted that the most delicate shades of articulate speech can be received and 

 transmitted by this instrument. 



Novel Belt-Tightener — In this improved device the tightening pulley is 

 carried by a hinged frame. Pivoted to the frame, so as to lie about at right 

 angles thereto, is a rack passing through a standard provided with a pinion en- 



