704 



RIVETING MACHINE 



Bwe imported in 1873. 



RICE CLEANING. Various machines have been contrived for effecting this 

 purpose, of which that invented by Mr. Melvil Wilson may be regarded as a good 

 example. It consists of an oblong hollow cylinder, laid in an inclined position, 

 having a great many teeth stuck in its internal surface, and a central shaft also 

 furnished with teeth. By the rapid revolution of the shaft, its teeth are carried 

 across the intervals of those of the cylinder with the effect of parting the grains of 

 rice, and detaching whatever husks or impurities may adhere to them. A hopper is 

 set above to receive the rice, and conduct it down into the cleansing cylinder. 



About 80 teeth are supposed to be set in the cylinder, projecting so as to reach very 

 nearly the central shaft, in which there is a corresponding number of teeth, that pass 

 freely between the former. 



RICE-PAPER. A name given to the material on which the Hindoos and 

 Chinese paint flowers, &c. It is the pith of the Aralia papyrifera. See PAPER. 



RICE-STARCH. See STAI.TH. 



RIDDING. In mining, a term used in the Newcastle coal-field for the operation 

 of separating the iron ore from the coal-shale. 



RIDER. In mining, a projecting piece of rock crossing a fissure or mineral vein, 

 and thus dividing it. 



RIFIiES. Bifled Ordnance and Fire-arms are described under ABTILI-EEY and 

 FIRE-ARMS. 



RINIVIANN'S GREEN. Oxide of cobalt and oxide of zinc. 



RIVETING MACHINE of Fairbairn. The invention of the riveting machine 

 originated in a turn-out of the boiler-makers in the employ of that engineer about 

 thirty -years ago. On that occasion the attempt was made to rivet two plates 

 together by compressing the red-hot rivet in the ordinary punching-press. Tho 

 success of this experiment immediately led to the construction of the original machine, 

 in which the moveable die was forced upon the rivet by a powerful lever acted upon 

 by a cam. A short experience proved the original machine inadequate to the numer- 

 ous requirements of the boiler-maker's trade, and the present form was therefore 

 adopted some years afterwards. 



The large stem A (fig. 1711) is made of malleable iron, and having an iron strap, B B, 

 screwed round the base, it renders the whole perfectly safe in case of the dies coming 

 in contact with a cold rivet, or any other hard substance during the process. Its con- 

 struction also allows the workmen to rivet angle-iron along the edges, and to finish 

 the corners of boilers, tanks, and cisterns ; and the stem being now made 4 feet 6 

 inches high, it renders the machine more extensive in its application, and allows of 

 its riveting the fire-box of a locomotive boiler or any other work within the given 

 depth. 



In addition to these parts, it has a broad moving slide, c, in which are three dies 

 corresponding with others in the wrought-iron stem. By using the centre die, every 



