the top of Hook Mountain literally blown into atoms but for interference by the Federal government. From the evidence found —namely, the depth and size of the tunnel— it was estimated that serious damage would result from the blast to houses for miles around, and that in all probability enough rock would be blown into the river partly to fill the channel and endanger navigation. A peremptory order to discontinue work was served by the government officials upon the quarrymen and the plan was abandoned. —N. Y. Tribune.
Perforating Machine for Quarries.— An illustrated account is given in La Nature of September I of a novel type of electric perforator, manufactured by the Charleroi Company for obtaining cylindrical sections of rocks or minerals. This is somewhat on the principle of the diamond drill, but in lieu of a crown of black diamonds, the drill consists of a steel cutter a
foot in length, mounted on ah iron cylinder 36.21 inches in diameter. The cylinder is driven electrically by a 20-horsepower engine at the rate of 50 to 70 revolutions per minute, and the cutter, aided by a stream of water containing sand and steel dust rapidly penetrates the rock and results in the production of cores of the above diameter.
What Is Meant by Annealing Steel.— If a piece of cast steel be allowed to cool freely from a casting temperature there will be a grain or crystal growth proceeding to a certain point, when the growth ceases. The metal in that condition will not possess its maximum ductility expressed as elongation and contraction of area. It will be more or less brittle, depending upon the carbon content. If that same piece of steel be re-heated to or about the point at which the grain growth stopped and allowed to cool slowly, the coarse grain developed
during the first cooling will be greatly modified, broken up or obliterated and replaced by a finer grain than it had originally. In this new condition the ductility will be greatly improved; the metal will be tougher and better fitted for service conditions in any case than without a re-heating. Such a re-heating is, properly speaking, “annealing.” The object, then, in annealing is to so affect the grains or crystals as to develop the maximum degree of toughness that a casting of a given composition is capable of developing.—Iron Trade Review.
Monte Carlo, the American and the Marine Hotel.—Les Sports, a Parisian paper of a character indicated by its name, gravely announces that next year Monte Carlo will have a unique hotel, namely, a great ocean liner, with 1,500 rooms, which will be anchored off the port of Monaco. Naturally only an American, in the eyes of
Lightning Rods
Protection assured by our continuous copper conductors. Our booklet of valuable information, “ Flashes of Lightning,” illustrated, sent free.
THOMAS W. JONES, 180 Front Street NEW YORK ___________
Butcher s
Boston Polish
Is the best finish made for FLOORS, Interior Woodwork and
Furniture.
Not brittle; wilKnei ther scratch nor deface like shellac or varnish. Is not soft and sticky like beeswax. Perfectly transparent, preserving the natural color and beauty of the wood. Without doubt the most economical and satisfactory Polish known for Hardwood Floors. For Sale by Dealers in. Points, Hardware
and House-Furnishings.
Sendforour FREE BOOKLET telling of the many advantages of BUTCHER’S BOSTON POLISH, The Butcher Polish Co., 356 Atlantic Avenue, Boston, Mass.
o r» • is a superior finish for Our No. O Keviver kitchen and piazza floors
STANLEY’S
BALL
BEARING HINGES
In WROUGHT BRONZE and STEEL
NEVER WEAR DOWN. NEVER CREAK. NEVER REQUIRE OILING.
The improved washer protects the balls against moisture and dust.
For Sale by Leading Hardware Dealers.
Attractive Literature for the asking.
THE STANLEY WORKS
NEW BRITAIN, CONN. NEW YORK CHICAGO
ESTABLISHED 1844 FRENCH’S
Paints and Varnishes
Highest Standard Attainable Write for prices and samples
Samuel H. French and Company
PHILADELPHIA
Mullins
Fireproof
Window
is absolutely fireproof and actually does what no other window can do it stands every test.
AsK for an Estimate or write for our convincing catalogue.
The W. H. Mullins Co 206 Franklin St. Salem, 0.
We also make everything in architectural sheet metal work—statuary, skylights, wrought iron grilles, cornices, etc. 120-page catalogue of stock designs on request.
“THROUGH FRISCO S FURNACE
EDITION
DE LUXE
Illustrations of seven modern steel frame buildings at San Francisco that withstood the earthquakes and fire of April 18th, 1906, with reports on the rust-resisting qualities ot Dixon s bilica- Graphite Paint on the steelwork.
WRITE FOR A FREE COPY OF BOOK No. B-14
JOSEPH DIXON CRUCIBLE CO., Jersey City, U. S. A.
MINERAL WOOL
FIRE, SOUND and VERMIN PROOF SAMPLES AMD CIRCULARS FREE
INSULATOR U. S. MINERAL WOOL CO„
143 Liberty St. NEW YORK
Proved
Best by
Every
Test
Perforating Machine for Quarries.— An illustrated account is given in La Nature of September I of a novel type of electric perforator, manufactured by the Charleroi Company for obtaining cylindrical sections of rocks or minerals. This is somewhat on the principle of the diamond drill, but in lieu of a crown of black diamonds, the drill consists of a steel cutter a
foot in length, mounted on ah iron cylinder 36.21 inches in diameter. The cylinder is driven electrically by a 20-horsepower engine at the rate of 50 to 70 revolutions per minute, and the cutter, aided by a stream of water containing sand and steel dust rapidly penetrates the rock and results in the production of cores of the above diameter.
What Is Meant by Annealing Steel.— If a piece of cast steel be allowed to cool freely from a casting temperature there will be a grain or crystal growth proceeding to a certain point, when the growth ceases. The metal in that condition will not possess its maximum ductility expressed as elongation and contraction of area. It will be more or less brittle, depending upon the carbon content. If that same piece of steel be re-heated to or about the point at which the grain growth stopped and allowed to cool slowly, the coarse grain developed
during the first cooling will be greatly modified, broken up or obliterated and replaced by a finer grain than it had originally. In this new condition the ductility will be greatly improved; the metal will be tougher and better fitted for service conditions in any case than without a re-heating. Such a re-heating is, properly speaking, “annealing.” The object, then, in annealing is to so affect the grains or crystals as to develop the maximum degree of toughness that a casting of a given composition is capable of developing.—Iron Trade Review.
Monte Carlo, the American and the Marine Hotel.—Les Sports, a Parisian paper of a character indicated by its name, gravely announces that next year Monte Carlo will have a unique hotel, namely, a great ocean liner, with 1,500 rooms, which will be anchored off the port of Monaco. Naturally only an American, in the eyes of
Lightning Rods
Protection assured by our continuous copper conductors. Our booklet of valuable information, “ Flashes of Lightning,” illustrated, sent free.
THOMAS W. JONES, 180 Front Street NEW YORK ___________
Butcher s
Boston Polish
Is the best finish made for FLOORS, Interior Woodwork and
Furniture.
Not brittle; wilKnei ther scratch nor deface like shellac or varnish. Is not soft and sticky like beeswax. Perfectly transparent, preserving the natural color and beauty of the wood. Without doubt the most economical and satisfactory Polish known for Hardwood Floors. For Sale by Dealers in. Points, Hardware
and House-Furnishings.
Sendforour FREE BOOKLET telling of the many advantages of BUTCHER’S BOSTON POLISH, The Butcher Polish Co., 356 Atlantic Avenue, Boston, Mass.
o r» • is a superior finish for Our No. O Keviver kitchen and piazza floors
STANLEY’S
BALL
BEARING HINGES
In WROUGHT BRONZE and STEEL
NEVER WEAR DOWN. NEVER CREAK. NEVER REQUIRE OILING.
The improved washer protects the balls against moisture and dust.
For Sale by Leading Hardware Dealers.
Attractive Literature for the asking.
THE STANLEY WORKS
NEW BRITAIN, CONN. NEW YORK CHICAGO
ESTABLISHED 1844 FRENCH’S
Paints and Varnishes
Highest Standard Attainable Write for prices and samples
Samuel H. French and Company
PHILADELPHIA
Mullins
Fireproof
Window
is absolutely fireproof and actually does what no other window can do it stands every test.
AsK for an Estimate or write for our convincing catalogue.
The W. H. Mullins Co 206 Franklin St. Salem, 0.
We also make everything in architectural sheet metal work—statuary, skylights, wrought iron grilles, cornices, etc. 120-page catalogue of stock designs on request.
“THROUGH FRISCO S FURNACE
EDITION
DE LUXE
Illustrations of seven modern steel frame buildings at San Francisco that withstood the earthquakes and fire of April 18th, 1906, with reports on the rust-resisting qualities ot Dixon s bilica- Graphite Paint on the steelwork.
WRITE FOR A FREE COPY OF BOOK No. B-14
JOSEPH DIXON CRUCIBLE CO., Jersey City, U. S. A.
MINERAL WOOL
FIRE, SOUND and VERMIN PROOF SAMPLES AMD CIRCULARS FREE
INSULATOR U. S. MINERAL WOOL CO„
143 Liberty St. NEW YORK
Proved
Best by
Every
Test