MECHANICS AND USEFUL ARTS. 85 



cry consists essentially of two distinct parts, one lettering the type or blocks 

 with which the impressions are made, and the other doing the printing. 



The lettering machine consists of a disk, or wheel, about eight inches in 

 diameter, on the periphery of which are lirmly-attached dies, representing 

 the letters of the alphabet. By revolving this wheel or disk on its axis a die 

 representing any desired letter is brought in position, and stamps its impress 

 on a small block, when another letter is brought in position, and so on until 

 the entire address is stamped, which is accomplished in about the same time 

 required by a compositor to set the same number of types in a stick. A 

 large number of these blocks, having been impressed with the addresses, 

 are readily attached to a band, thus forming an endless belt of blocks. 

 These belts are systematically arranged in boxes, so that any address may 

 be referred to in a moment, for change or other purpose. When used, a 

 belt is taken from the box and placed on the printing-machine ready for 

 operation in a few seconds, when the impressions are made by a slight pres- 

 sure with the foot, as rapidly as the papers or wrappers can be removed from 

 the press. The entire apparatus is operated by hand, is simple, compact, 

 cheap, requires no skill to work it, and is not liable to get out of repair, 

 which renders it well adapted to papers of small as well as large circulation. 



MEASURING FAUCET. 



Whitman's measuring and registering faucet is simply a force-pump with 

 a solid piston operated by a lever or crank. The cylinder is of the capacity 

 of the unit of measure (pint, quart, etc.), and at each discharge an index on 

 a dial-plate moves forward one degree. Mr. Whitman thinks this invention 

 will supersede the use of funnels in grocery stores, abate the nuisance of flies 

 about molasses casks, and detect frauds in the capacity of barrels. The 

 faucet, made of cast iron, and capable of measuring quarts, is sold for four 

 dollars. 



NEW GRINDING AND POLISHING APPARATUS. 



The Xew York Belting Company are now introducing a new form of 

 emery wheel, which bids fair to supersede entirely the ordinary mode of 

 covering a wheel with glue and sprinkling emery upon it. The emery is 

 incorporated with India-rubber and sulphur, and while in a plastic state is 

 put into moulds, and submitted, under great pressure, to a high degree of 

 heat, according to Goodyear's patent for vulcanizing; this converts it into 

 a solid granular mass, resembling granite or iron. It can be made of any 

 desired grade of emery, and used either dry or with oil or water. The 

 Avhcels can be turned off in a lathe, running very slow, in the same manner 

 as iron is turned, which will enable parties using them to turn the face of 

 the wheel to conform to work of any irregular shape, or to " true" them if 

 necessary. 



NEW MODE OF JOINING PIPES. 



Mr. Siemens has exhibited at the London Institution of Civil Engineers a 

 machine of his invention, manufactured by Messrs. Guest and Chrimes, for 

 joining lead and other pipes by pressure only. The machine consisted of 

 a strap of wrought iron, in the shape of the letter V, and of three dies, two 

 of which were free to slide upon the inclined planes, while the third was 



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