- Email: [email protected]
Artificial graphite
Aug., ~92o.1
CURP,EXT TOPtCS.
293
present lake, according to the United States Geological Survey, l ) e p a r t m e n t of the [nterior. D u r i n g the Xeocene epoch and the earlier p a r t of the Pleistocene epoch its w a t e r stood much higher than now, but in its overflow it has since cut t h r o u g h the lava d a m s that m a i n t a i n e d it at that height. Distinct beaches that m a r k the f o r m e r higher levels of the lake stand a b o u t Ioo feet above its i)resent surface, but the w a t e r doubtless once stood at even g r e a t e r heights. At T a h o e City the m o s t distinct of these old beaches is a terrace that stands 35 to 4o feet above the level of the lake. It is on this ancient beach that Tahoe Tavern is built. Artificial Graphite. (U. S. Geological Survey, Press Bttlletil~, A:o. 45I, July, I 9 2 O . ) - - G r a p h i t e is m a n u f a c t u r e d by the Acheson Graphite C o m p a n y at N i a g a r a Falls, N. Y. T h i s c o m p a n y utilizes the electric p o w e r g e n e r a t e d at the Falls to m a n u f a c t u r e g r a p h i t e from anthracite coal or from p e t r o l e u m coke. T h i s prodnct is used mainly in lubricants, but it is also used in paints, f o u n d r y facing, p r e v e n t i v e s of boiler scale, and fillers for batteries. Artificial graphite m a y be used for any purpose for which natural g r a p h i t e is employed, according to the United States Geological Survey, except in the m a n u f a c t u r e of large crucibles. Patents have been issued recently', however, for m e t h o d s of lnanuf a c t n r i n g crucibles in which artificial graphite m a y be used. Artificial g r a p h i t e is peculiarly adapted to the m a n u f a c t u r e of certain graphite products, a m o n g t h e m graphite electrodes, which are not made from natural graphite and for which the d e m a n d has g r e a t l y increased in recent years. T h e table below, published by permission of the Acheson" Graphite C o m p a n y , r e p r e s e n t s only the m a n u f a c t u r e d graphite that comes into competition with natural graphite. (~R.\PtlITE .~'[ANL'F.',CTURED BY THE .\t'IIESON GR.\PHI'r~: CnMI'.\NY. 1915 I916
................................ ................................
Pounds. 5,084,OOO 8,397,28~
~917 ~918 1919
................................ ................................
IO,474.649 9, t 8 2 , 2 7 2
................................
I 9 I 5 1919.
8,163,I77
A Directional Hot-wire Anemometer of High Sensitivity, Especially Applicable to the Investigation of Low Rates of Flow of Gases. J. S. G. Tno.~1as. (Proc. Physical 5"oc. of 1.oudo~,, April ~5, I 9 2 O - ) - - T w o pieces of p l a t i n u m wire, I nllll, ill diameter, were stretched across the d i a m e t e r of a tube. T h e y were parallel to each o t h e r with an interval of L ram. between them. They were perpendicular to the axis of the tube and the plane containing t h e m was parallel to the direction of flow of the gas. T h e wires formed the two a r m s of a \ ~ ' h e a t s t o n e bridge. T h e y were traversed by a current which raised the t e m p e r a t u r e to about 3oo ° C. VOL. I~)O, N o . I I 3 6 - - 2 I
CURP,EXT TOPtCS.
293
present lake, according to the United States Geological Survey, l ) e p a r t m e n t of the [nterior. D u r i n g the Xeocene epoch and the earlier p a r t of the Pleistocene epoch its w a t e r stood much higher than now, but in its overflow it has since cut t h r o u g h the lava d a m s that m a i n t a i n e d it at that height. Distinct beaches that m a r k the f o r m e r higher levels of the lake stand a b o u t Ioo feet above its i)resent surface, but the w a t e r doubtless once stood at even g r e a t e r heights. At T a h o e City the m o s t distinct of these old beaches is a terrace that stands 35 to 4o feet above the level of the lake. It is on this ancient beach that Tahoe Tavern is built. Artificial Graphite. (U. S. Geological Survey, Press Bttlletil~, A:o. 45I, July, I 9 2 O . ) - - G r a p h i t e is m a n u f a c t u r e d by the Acheson Graphite C o m p a n y at N i a g a r a Falls, N. Y. T h i s c o m p a n y utilizes the electric p o w e r g e n e r a t e d at the Falls to m a n u f a c t u r e g r a p h i t e from anthracite coal or from p e t r o l e u m coke. T h i s prodnct is used mainly in lubricants, but it is also used in paints, f o u n d r y facing, p r e v e n t i v e s of boiler scale, and fillers for batteries. Artificial graphite m a y be used for any purpose for which natural g r a p h i t e is employed, according to the United States Geological Survey, except in the m a n u f a c t u r e of large crucibles. Patents have been issued recently', however, for m e t h o d s of lnanuf a c t n r i n g crucibles in which artificial graphite m a y be used. Artificial g r a p h i t e is peculiarly adapted to the m a n u f a c t u r e of certain graphite products, a m o n g t h e m graphite electrodes, which are not made from natural graphite and for which the d e m a n d has g r e a t l y increased in recent years. T h e table below, published by permission of the Acheson" Graphite C o m p a n y , r e p r e s e n t s only the m a n u f a c t u r e d graphite that comes into competition with natural graphite. (~R.\PtlITE .~'[ANL'F.',CTURED BY THE .\t'IIESON GR.\PHI'r~: CnMI'.\NY. 1915 I916
................................ ................................
Pounds. 5,084,OOO 8,397,28~
~917 ~918 1919
................................ ................................
IO,474.649 9, t 8 2 , 2 7 2
................................
I 9 I 5 1919.
8,163,I77
A Directional Hot-wire Anemometer of High Sensitivity, Especially Applicable to the Investigation of Low Rates of Flow of Gases. J. S. G. Tno.~1as. (Proc. Physical 5"oc. of 1.oudo~,, April ~5, I 9 2 O - ) - - T w o pieces of p l a t i n u m wire, I nllll, ill diameter, were stretched across the d i a m e t e r of a tube. T h e y were parallel to each o t h e r with an interval of L ram. between them. They were perpendicular to the axis of the tube and the plane containing t h e m was parallel to the direction of flow of the gas. T h e wires formed the two a r m s of a \ ~ ' h e a t s t o n e bridge. T h e y were traversed by a current which raised the t e m p e r a t u r e to about 3oo ° C. VOL. I~)O, N o . I I 3 6 - - 2 I