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Riehle Brothers' improved vertical testing machine, 50,000 pounds capacity
[Feb., 1881.]
Vertical Testing Machine.
147
RIEHLE BROTHERS' IMPROVED VERTICAL TESTING M A C H I N E , 50,000 P O U N D S C A P A C I T Y . The illustration represents one of I~iehl6 Brothers' improved machines for testing specimens of material, up to 50,000 pounds, by tensile, transverse and crushing strains. It is compact, strong and :accurate, and well adapted for the purpose it is designed for. The shape and style are good, the various parts substantial in construc.tion, and tile workmanship unexcelled throughout the whole machine.
It is composed entirely of iron, brass and steel, and weighs about one ton. The dimensions are as follows : Extreme height, 8 feet; extreme length, 7 feet; extreme width, 2 feet 6 inches; motion of plunger of jack, 8 inches. This apparatus can test a specimen by tensile strain
148
Gold and Sllver in Spanish Pyrites. [Jour. Frank. 'Inst:.
from 4 or 5 inches up to 24 inches iu length ; transverse specimen up to 14 inches, and by the application of a superior beam to still greater lenglh ; crushing specimens, 7 inches in diameter and less, up to about 20 inches. This is a wider range of test than any machine of corresponding capacity that is made. In testing flat specimens o f metal and other material with wedge grips trauble has often been experienced by the specimen slipping on or near one edge, caused by a variation iN the density of the fibres of the material ; this is obviated by a simple device conceived by one of the members of the firm of Riehl~ Bi'os.r namely, making the wedges slightly convex in form on their face, which at once causes the indentations of the surfaces of the wedge grips to fasten on to the test specimen, thus at once rendering the pull direct, however much the tendency may be, during the operation, of the specimen yielding to a tearing break caused by the metal naturally breaking at the weakest place, if such should exist on or near the edge of the specimen. By referring to the engraving it will be observed that the tools which hold each end of the specimen are connected; the lowec one. with the power, viz., the hydraulic jack and pump, and the other with a system of multiplying levers, terminating with the weighing beam. The specimens being placed in position, the power exerted by the hydraulic pump is communicated through the specimen and the system of levers to the beam, which is kept in equipoise by the use of the poises, which are moved out, during the process of applying increased power, and consequent increased strain upon specimen, thus securing the correct registering upon the beam of the strain upon the specimen. After the test the plunger, being balanced by the lever and weight shown in the illustration, returns at once to its position before the test was made and is ready for another test. In a screw machine, the returning of the tools entails a laborious and tedious operation, almost as tiresome as the making of the test; for that reason, the public has cast its vote in favor of. the hydraulic machine, especially in large machines.
Gold and Silver in Spanish Pyrites. The quantity of silver which has been extracted in England, as an accessory product of the pyrites imported from Spain, has been 18,000 ounces, and the quantity of gold about 700 ounces. A new industry has thus arisen from a product which no one suspected a few years ago to have any merchantable value.--La Gaeeta Industrial. C.
Vertical Testing Machine.
147
RIEHLE BROTHERS' IMPROVED VERTICAL TESTING M A C H I N E , 50,000 P O U N D S C A P A C I T Y . The illustration represents one of I~iehl6 Brothers' improved machines for testing specimens of material, up to 50,000 pounds, by tensile, transverse and crushing strains. It is compact, strong and :accurate, and well adapted for the purpose it is designed for. The shape and style are good, the various parts substantial in construc.tion, and tile workmanship unexcelled throughout the whole machine.
It is composed entirely of iron, brass and steel, and weighs about one ton. The dimensions are as follows : Extreme height, 8 feet; extreme length, 7 feet; extreme width, 2 feet 6 inches; motion of plunger of jack, 8 inches. This apparatus can test a specimen by tensile strain
148
Gold and Sllver in Spanish Pyrites. [Jour. Frank. 'Inst:.
from 4 or 5 inches up to 24 inches iu length ; transverse specimen up to 14 inches, and by the application of a superior beam to still greater lenglh ; crushing specimens, 7 inches in diameter and less, up to about 20 inches. This is a wider range of test than any machine of corresponding capacity that is made. In testing flat specimens o f metal and other material with wedge grips trauble has often been experienced by the specimen slipping on or near one edge, caused by a variation iN the density of the fibres of the material ; this is obviated by a simple device conceived by one of the members of the firm of Riehl~ Bi'os.r namely, making the wedges slightly convex in form on their face, which at once causes the indentations of the surfaces of the wedge grips to fasten on to the test specimen, thus at once rendering the pull direct, however much the tendency may be, during the operation, of the specimen yielding to a tearing break caused by the metal naturally breaking at the weakest place, if such should exist on or near the edge of the specimen. By referring to the engraving it will be observed that the tools which hold each end of the specimen are connected; the lowec one. with the power, viz., the hydraulic jack and pump, and the other with a system of multiplying levers, terminating with the weighing beam. The specimens being placed in position, the power exerted by the hydraulic pump is communicated through the specimen and the system of levers to the beam, which is kept in equipoise by the use of the poises, which are moved out, during the process of applying increased power, and consequent increased strain upon specimen, thus securing the correct registering upon the beam of the strain upon the specimen. After the test the plunger, being balanced by the lever and weight shown in the illustration, returns at once to its position before the test was made and is ready for another test. In a screw machine, the returning of the tools entails a laborious and tedious operation, almost as tiresome as the making of the test; for that reason, the public has cast its vote in favor of. the hydraulic machine, especially in large machines.
Gold and Silver in Spanish Pyrites. The quantity of silver which has been extracted in England, as an accessory product of the pyrites imported from Spain, has been 18,000 ounces, and the quantity of gold about 700 ounces. A new industry has thus arisen from a product which no one suspected a few years ago to have any merchantable value.--La Gaeeta Industrial. C.