348 Intelligence and Miscellaneous Articles. 



inch, and at the rate of about 12^ cubic feet per hour (with a pressure 

 of 20 tenths maintained), although the tube is stopped up, and is 

 partially filled with water. 



Though deficient in illuminating quality, the gas burns well 

 when mixed with air and gives a good bunsen-flame. The author 

 considers that it is probably derived from the lower beds pierced, 

 that is, the Purbeck strata, or by percolation from the still lower 

 Kimeridge beds, which were not reached by the borings. The 

 borings pierce the southern slope of the great anticline which runs 

 from Fairlight into Mid Sussex and is joined at Heathfield by 

 another considerable anticline running through Burwash. 



2. « Note on Natural Gas at Heathfield Station (Sussex).' By J. 

 T. Hewitt, M.A., D.Sc, Ph.D. 



A sample of natural gas from a boring at Heathfield was taken 

 in December 1897, and analysed with the following result : — 



Methane 919 



Hydrogen 7*2 



Nitrogen 0*9 



Oxygen, carbon dioxide, carbon monoxide, olefines, and hydrocarbon 



vapours were altogether absent. 



A specimen of a bed of lignite (dried at 110° Centigr.) was also 



analysed : — Total Percentage of 



analysis. organic materials. 



Carbon 943 5187 



Hydrogen 183 1007 



Nitrogen 0"68 3-74 



Sulphur 1-27 6-99 



Oxygen ;... 497 27*33 



Ash 8182 



10000 10000 



An analysis of the ash is also given in the paper. 



XXXV. Intelligence and Miscellaneous Articles. 

 To the Editors of the Philosophical Magazine. 

 Gentlemen, 



IN answer to Prof. Lanza's letter in August number of the 

 Phil. Mag. p. 260, respecting my method of measuring the 

 torsional angle of a rotating shaft, I beg to state that I knew 

 nothing whatever of Prof. Lanza's work when I devised the method 

 to which he alludes. On referring to the note on his work in 

 ' Engineering,' Jan. 14, 1887, I find an illustration of the Pro- 

 fessor's apparatus, but of the method of electrically measuring the 

 torsion no mention whatever is made ; and it certainly could not 

 be discovered from the diagram, which is rather too heavily shaded 

 to be definite in detail. The method I use (Phil. Mag. Feb. 1898) 

 was suggested to me by my own form of dynamornetric speed- 

 indicator, described on p. 12 of a small book on 'Work-Measuring 

 Machines ' written by me, and published by Spon & Co., London 

 & New York, 1884. The speed-indicator was used in the Paris 

 Electrical Exhibition, 1881, for determining the relative velocities 

 of two rotating shafts by means of a telephone included in an 

 electrical circuit controlled by contact-disks attached to the shafts. 

 Oxford, August 19th, 1898. F. J. Jekvis-Smith. 



