CONTENTS. IX 



Page 



7. On an Instrument for Determining the Sensible Warmth of Air. By 

 Professor G. Foebes, F.R.S.E 277 



8. On Synchronism of Mean Temperature and Rainfall in the Climate of 

 London. By H. Courtenat Fox, M.R.O.S 277 



9. Experiments on the Influence of the Angle of the Lip of Rain Gauges on 

 the Quantity of Water Collected. By Baldwin Latham, C.E., M. Inst. 

 C.E., F.G.S., F.M.S., &c 278 



10. An Anemometer for Measuring the speed of Smoke or Corrosive Vapour. 



By Alfred E. Fletcher, F.C.S 279 



11. On an improved Rain Gauge. By N. Lowenthal Lonsdale 280 



12. On a Galvanometer for demonstrating the Internal Current transmitted 

 through the Liquid within a Voltaic Cell. By Conrad W. Cooke, C.E., 

 M.S.T.E 280 



TUESDAY, AUGUST 26, 1879. 



1. Report of the Committee on Astronomical Clocks 282 



2. Report of the Committee on Rock-conductivities 282 



3. Report of the Committee on Instruments for detecting Fire-damp in 

 Mines 282 



4. Suite des Recherches sur la Photographic Solaire. Par Dr. J. Janssen, 



de rinstitut de France 282 



5. Sur l'Application du Revolver Photographique a, l'Etude des Eclipses Par- 

 tielles et a celle des Mouvements des Animaux. Par Dr. J. Janssen, de 

 l'lnstitut 283 



6. Further Results of Experiments on Friction at High Velocities. By 



Captain Galton 283 



7. On the Bursting of Firearms when the Muzzle is closed with Snow, Earth, 



&c. By Professor George Forbes, F.R.S.E 283 



8. Note on the Constancy of Capacity of certain Accumulators. By Dr. 

 Alexander Muirhead, F.C.S 283 



9. Note on the Capacity of a certain Condenser, and on the value of V. By 



C. Hockin, M.A 285 



10. On an Electrical Gyrostat. By Professor G. Forbes, F.R.S.E 290 



11. On the Condition which must he fulfilled by any number of Forces 

 directed towards Fixed, or Movable, Centres, in order that any given 

 curve should be described freely by a particle acted on by these Forces 

 simultaneously ; and an analogous Problem. By Arthur Hill Curtis, 

 LL.D 290 



12. On a Theorem relating to the Transformation of Series. By the Rev. S. 

 Earnshaw, M.A 291 



13. Improved Photographic Screens. By J. H. Starling, F.C.S., A.I.C. ... 291 



14. On a Binocular Spectroscope. By G. Johnstone Stonet, M.A., F.R.S. . 292 



15. On a Simple two-prism Automatic Motion. By G. Johnstone Stonet, 

 M.A., F.R.S 292 



16. On Scales of Variable Length for the eye-pieces of Spectroscopes. By G. 

 Johnstone Stonet, M.A., F.R.S 292 



17. On Flight and its Imitations, By F. W. Breart „. 292 



