- Email: [email protected]
A sixth satellite of jupiter
June, 19o5.]
Notes a~ld Comments.
437
pletion of the w o r k s b e f o r e it will ensue. N o ! E v e r y laver of a crib will p r o v o k e i m p r o v e m e n t , if t h e a b o v e s k e t c h e d p r o g r a m is followed. I n the a b o v e I have r e f r a i n e d f r o m c o n s i d e r i n g t h e financial q u e s t i o n , a n d for cause. I h a v e not, a n d c a n n o t have, the least idea of the c o s t of w o r k s , w h e n n o t even a g e n e r a l s c h e m e can be fixed for w a n t of plans, &c. T h e only plans at m y disposal relate to the r e a c h b e l o w Q u a r a n t i n e point, a n d t h a t was sufficient m e r e l y t o illustrate in a s k e t c h m y p r o p o s i t i o n s . But a l t h o u g h the p r o p o s e d s y s t e m is simplicity itself, I h a v e n o t a s h a d o w of a d o u b t t h a t it will involve g r e a t cost, and t h a t even with g r e a t activity a c e n t u r y will b a r e l y be sufficient for c a r r y i n g t h e m out. B u t a g r e a t river like t h e Mississippi is w o r t h its n u r s i n g , a n d a g r e a t n a t i o n like the U n i t e d S t a t e s of A m e r i c a is w o r t h y the t a s k of n u r s i n g a g r e a t river in its bosom. B u i t e n z o r g , Java, J u l y 8th, 19o4.
A SIXTH SATELLITE OF JUPITER. A telegram has been received at the Harvard College Observatory from Prof. W. W. Campbell, at Lick Observatory, stating that a sixth satellite of Jupiter, suspected by Perrine in December, was discovered by him January 4th, 19o5. The position with respect to Jupiter from previous plates taken in January, is as follows: Position angle 269 deg., distance 45. The distance is decreasing 45 sec. daily. The apparent'motion is retrograde and the magnitude 14. Derived from observations with the Crossly reflecto7 on December 3, 8, 9, IO, and January 2, 3, 4-
CLQCK ACTUATED BY RADIUM. A clock which will run for two thousand years has been invented by Richard Strutt, son of Lord Rayleigh. The motive power is a small piece of gold-leaf which is electrified by means of a very small quantity of radium salt. It bends away from the metal substance and keeps moving under this influence until it touches the side of the containing vessel. At the moment of contact it loses its electrical charge and then springs back and is again electrified, and the process repeated. Sir William Ramsay considers that this may be made into a very reliable time-piece at an expense Df about $IOOO.--Scientitic American. VOL. CLIX. No. 954. 29
Notes a~ld Comments.
437
pletion of the w o r k s b e f o r e it will ensue. N o ! E v e r y laver of a crib will p r o v o k e i m p r o v e m e n t , if t h e a b o v e s k e t c h e d p r o g r a m is followed. I n the a b o v e I have r e f r a i n e d f r o m c o n s i d e r i n g t h e financial q u e s t i o n , a n d for cause. I h a v e not, a n d c a n n o t have, the least idea of the c o s t of w o r k s , w h e n n o t even a g e n e r a l s c h e m e can be fixed for w a n t of plans, &c. T h e only plans at m y disposal relate to the r e a c h b e l o w Q u a r a n t i n e point, a n d t h a t was sufficient m e r e l y t o illustrate in a s k e t c h m y p r o p o s i t i o n s . But a l t h o u g h the p r o p o s e d s y s t e m is simplicity itself, I h a v e n o t a s h a d o w of a d o u b t t h a t it will involve g r e a t cost, and t h a t even with g r e a t activity a c e n t u r y will b a r e l y be sufficient for c a r r y i n g t h e m out. B u t a g r e a t river like t h e Mississippi is w o r t h its n u r s i n g , a n d a g r e a t n a t i o n like the U n i t e d S t a t e s of A m e r i c a is w o r t h y the t a s k of n u r s i n g a g r e a t river in its bosom. B u i t e n z o r g , Java, J u l y 8th, 19o4.
A SIXTH SATELLITE OF JUPITER. A telegram has been received at the Harvard College Observatory from Prof. W. W. Campbell, at Lick Observatory, stating that a sixth satellite of Jupiter, suspected by Perrine in December, was discovered by him January 4th, 19o5. The position with respect to Jupiter from previous plates taken in January, is as follows: Position angle 269 deg., distance 45. The distance is decreasing 45 sec. daily. The apparent'motion is retrograde and the magnitude 14. Derived from observations with the Crossly reflecto7 on December 3, 8, 9, IO, and January 2, 3, 4-
CLQCK ACTUATED BY RADIUM. A clock which will run for two thousand years has been invented by Richard Strutt, son of Lord Rayleigh. The motive power is a small piece of gold-leaf which is electrified by means of a very small quantity of radium salt. It bends away from the metal substance and keeps moving under this influence until it touches the side of the containing vessel. At the moment of contact it loses its electrical charge and then springs back and is again electrified, and the process repeated. Sir William Ramsay considers that this may be made into a very reliable time-piece at an expense Df about $IOOO.--Scientitic American. VOL. CLIX. No. 954. 29