| RefNo | EC/1895/12 |
| Previous numbers | Cert XI, 281 |
| Level | Item |
| Title | Holden, Sir Henry Capel Lofft: certificate of election to the Royal Society |
| Citation | In India from 1877-1884, he carried out a number of experiments in telephony and telegraphy for the Indian Government. Since 1885 he has been in charge of the Department for the proofs of Naval and Land Service Ordnance, and Gunpowders, and for experimental work connected therewith, and has invented and constructed many pieces of apparatus connected with the science of artillery, as well as with electrical and scientific research. Amongst those which have been publicly exhibited are his devices in connection with the chronograph, for measuring the velocity of projectiles; an extremely accurate and sensitive hydrometer for measuring the variations of the density of the acids in the electrolyte accumulator cells (exhibited Royal Society, 1887; see also paper before Iron and Steel Inst, 1891); a high-speed chronographic pen for recording minute intervals of time by electromagnetic means; various instruments for making accurate and rapid tests of the pressure and current in direct current circuits, and in alternating current circuits of both high and low frequency (some exhibited Royal Society, 1892); an instrument for rapidly ascertaining the EMF and resistance of a galvanic cell (exhibited Royal Society, 1893); a compact moving coil galvanometer adapted to universal purposes, which was employed by Profs Dewar and Fleming in their researches on the resistance of metals, and is used in the recording pyrometer of Prof Roberts-austen. He was deputed by the Commander-in-Chief to write the electrical sections of the Paris Exhibition of 1889, the Frankfort Exhibition of 1891, and the Chicago Exhibition of 1893, and furnished the Government with most valuable reports. |
| Proposers | From Personal Knowledge: P A MacMahon; A G Greenhill; W Anderson; Frederick Bramwell; F A Abel; B Baker; Frederick J Smith; C V Boys; W de W Abney; James Dewar; W H Preece; W E Ayrton |
| Extent | 1 sheet |
| AccessStatus | Open |
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Fellows associated with this archive
| Code | PersonName | Dates |
| NA7006 | Holden; Sir; Henry Capel Lofft (1856 - 1937) | 1856 - 1937 |