152 
JOURNAL OF THE PLYMOUTH INSTITUTION. 
From an early period he devoted much attention to medical 
electricity, and introduced a very admirable modification of the 
induction coil machine, which has obtained considerable celebrity. 
He experimented largely on the production of power by elec- 
tricity, and on the utilization of the electric light, and was an 
early, if not the earliest, proposer of its use for military and naval 
purposes. In concert with the local authorities he showed the 
possibility of exploring the country around at night by the use of 
the light from the top of the Devonport Column. In 1846 he ex- 
hibited at the Royal Cornwall Polytechnic Society an arrangement 
of primary and secondary coils, with which sparks were obtained 
in air, and discharges several inches long through rarefied air, and 
with which Leyden jars were charged. In 1853-4 he brought out 
an induction coil, which was a great improvement on the Ruhm- 
korff. He was one of the earliest advocates of the use of sub- 
marine telegraphs, and invented a form of cable which with some 
modification was used as a sea-cable. The subjoined list of papers 
published by him will give some faint idea of his industry. His 
lamented decease leaves a vacancy in the ranks of the members of 
our Society which will prove very difficult to fill. 
"On Arnott's Stoves." Read at the Plymouth Meeting of the British 
Association, 1841. 
" On a New Magnetometer, a New Rotating Electro-motive Engine, and 
a New Thermo-Electrometer." Eoyal Cornwall Polytechnic Society's 
Report, 1844. 
*' On a New Form of Medical Galvanic Machine, with Double Index Gradua- 
tion." Royal Cornwall Polytechnic Society's Report, 1846. 
" Some New Effects of Induction Apparatus for Medical Purposes." Ibid, 1848. 
" A New and Powerful Cast Iron Magnet." Ibid, 1848. 
" A New and Powerful Form of Static Induction Coil." Ibid, 1856. 
" A New Arrangement of the Induction Coil." Philosophical Magazine, 1856. 
"Some New Statical and Thermal Effects of a Powerful Induction Appa- 
ratus." Royal Cornwall Polytechnic Society's Report, 1856. 
" New Form of Telegraph Cable intended to reduce the effects of Inductive 
Action." Royal Cornwall Polytechnic Society's Report ; " Philosophical 
Magazine," 1859. 
a Electrical Conductivity of Metals." "Philosophical Magazine," 1860. 
" The Inductometer." Royal Cornwall Polytechnic Society's Report, 1860. 
" On the Imperfection in the Present Mode of Fitting Lightning Con- 
ductors." Devonshire Association Transactions, 1863. 
"New Deep-Sea Pressure Gauge." Ibid, 1862. 
" Some Experiments with the Electric Light." Devonshire Association 
Transactions, 1865. 
