MECHANICS AND USEFUL ARTS. 91 



main principle by which this is effected, is, we understand, by the 

 application of small trucks applied to the external part of the disc, 

 and by which the necessary motion is communicated, and the saw held 

 at the same time in place. 



IMPROVED PLOUGH. 



MEASURES to secure a patent for improvements in ploughs have 

 been taken by J. B. Wilder, of Belfast, Me. The nature of the in- 

 vention consists in employing a revolving mould-board, so arranged 

 and attached to the share and land-side plate, that it may be turned 

 independently of the share, which also revolves. By this improvement 

 both the mould-board and share can be shifted to either side of the 

 land-side plate, so that the dirt or sod may be turned in either direc- 

 tion. The object in making the mould-board in this manner is to 

 allow of its having an independent motion irrespective of the share, 

 which hitherto has not been done. In every improvement of this 

 kind, with revolving share and mould-board, the two have been 

 always connected, so that the efficacy of the latter has been materially 

 sacrificed in order to make it suit in the opposite positions to which it 

 may be required to be altered. Scientific American. 



MACHINE FOR PICKING UP STONES. 



THE New England Farmer describes a machine recently devised 

 for picking up stones, one of the most laborious duties of the farmer. 

 The arrangement consists of a large cylinder on a common axle and 

 cart wheels, containing four rows of teeth or lifters. Gearing on the 

 hubs of the wheels and on the ends of the cylinder, gives the latter a 

 rotary motion, when the teeth pick up the stones and deposit them in 

 a box. When the box is full, the cylinder is raised and the load 

 carried off and upset as from a common cart. 



PLASTERING MACHINE. 



A MACHINE for the purpose of superseding manual labor in the 

 operation of plastering walls, has been invented by Isaac Hussey, of 

 Ohio. It consists of a movable frame upon rollers that can be adjusted 

 to suit an}' height, and of a smaller frame sliding within it. The latter 

 serves to support a mortar box containing the trowel, which is raised 

 and lowered by means of a drum and endless chain. When in opera- 

 tion the trowel is supplied w T ith mortar by a rod and follower, which 

 are worked by a lever, the quantity being regulated or shut off, as 

 required, by a slide that covers the opening in the box. For plaster- 

 ing ceiling it is only requisite to raise the mortar box to the top of the 

 frame, and for side walls it is adjusted accordingly by turning it to a 

 proper position. For this last-named operation the box is shifted by 

 the sliding frame, which is moved back and forth for that purpose by 

 means of the already mentioned lever. There are also various cords 

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