| Description | Brief listing of exhibits and exhibitors at the Royal Society's annual displays at Burlington House, London, with descriptive text. Arranged by rooms. Rooms 1-4 and Ground Floor. The programme commences with a note on demonstrations taking place during the evening.
Room 1 (Officers' Room):
1. Demonstrations of fluorescence in lepidoptera by ultra violet radiation, exhibited by Dr. J. C. Mottram and Edward Alfred Cockayne.
2. Instrument for determining the pressure developed by detonators by Hopkinson's principle, exhibited by Sir Robert Robertson.
3. Four transparencies of total eclipse of the Sun, 29th May 1919, five photographs of Sun and sun-spots, photograph of records magnetic disturbance 22nd-25th March 1920, diagram showing variation of latitude from 1912 to 1919, exhibited by the Royal Observatory, Greenwich.
4. Three photographs of portions of the Moon taken with the 100-inch telescope of the Mount Wilson Observatory, exhibited by the Royal Astronomical Society.
5. Portrait in oil of J. T. Desaguliers F.R.S. This portrait hitherto unknown has been recently discovered and is possibly the work of Richardson, Microscope made for Joseph Priestly by Benjamin Martin 'at the new invented visual glasses, Fleet Steet' with its receipted bill dated 1767, original letter of Priestley written at Calne 1779, exhibited by George Hugh Gabb.
6. Microscope and accessories made by Powell and Lealand in 1843, exhibited by the Royal Society.
Room 2 (Council Room):
7. Noon reflector, azimuth declination time chart, exhibited by Chares Vernon Boys.
8. Experiments in rotational dynamics, exhibited by Mr. C. R. Gibson for Joseph Goold.
9. A new apparatus for drawing conic curves, exhibited by Mr. A. F. Dufton.
10. The Douglas Fir flag staff and its erection in the Royal Botanic Gardens, exhibited by Sir David Prain, the Director, Royal Botanic Gardens, Kew.
11. Some recent applications of the x-rays, exhibited by Major George William Clarkson Kaye.
Room 3 (Old Council Room):
12. Apparatus used in the determination of the variation of rigidity with temperature, exhibited by Henry Reginald Arnulph Mallock.
13. Apparatus for showing the existence of a true North and South directive force in the electricity of the atmosphere, exhibited by Mr. E. A. Reeves.
14. Clays treated by electro-osmosis: photomicrographs and specimens of articles made with osmosed clay, exhibited by the Osmosis Company Limited.
15. Wireless telegraph apparatus, exhibited by Marconi's Wireless Telegraph Company Limited.
16. Diagram of algebraic gyroscopic motion, portrait of the Rev. F. [Francis] Bashforth aged 92, pioneer of the modern ballistic theory, exhibited by Sir George Greenhill and Sir George Hadcock.
17. Method of mounting panoramic views of wide angle, exhibited by the Royal Geographical Society.
18. Palaeozoic starfish and their habits, exhibited by William Kingdon Spencer.
19. Model to illustrate an hypothesis of the origin of mountains, exhibited by Richard Dixon Oldham.
20. Prehistoric rock engravings from North Russia, a series of Palaeolithic stone implements from North Africa, exhibited by Miles Crawford Burkitt.
Room 4 (Principal Library):
21. Drawings of Hydracarina (water mites), exhibited by Charles David Soar.
22. Apparatus for air navigation, exhibited by the Air Ministry Laboratory.
23. Spherometer with interference ring method of detecting contact between end of screw and surface under test, empirical magnification spherometer for very large curvatures, spectroscope, critical angle method of determining refractive indices near 1.52 without use of a divided circle (Mr, J. Guild and Dr. J. S. Anderson), orientated lustre of etched crystalline surfaces (Dr W. [Walter] Rosenhain and Mr. J. H. Haughton), wind pressure records from Tower Bridge (Dr. T. E. [Thomas Edward] Stanton), exhibited by the National Physical Laboratory.
24. Vacuum grating spectrograph for the extreme ultra-violet, exhibited by Messrs. Adam Hilger Limited.
25. Synthetic products for perfumery, exhibited by Messrs. J. Crosfield & Son Limited.
26. New instruments and diagrams, exhibited by the Meteorological Office.
27. Optic indicator for internal combustion engines, exhibited by Frederick William Burstall.
28. Magnetic compasses - recent developments, exhibited by the Admiralty Compass Department.
29. Phenomena of viscosity in a rotating bowl of liquid, exhibited by Geoffrey Thomas Bennett.
30. A method of demonstrating flagellae on micro-organisms, photo-micrographs obtained by means of ultra-violet light, exhibited by Joseph Edward Barnard and Dr. W. Topley.
31. A new microtome, exhibited by the Cambridge and Paul Instrument Company Limited.
32. Enlarged photographs of fossil insects from the British coal measures, exhibited by Herbert Bolton.
33. Samples of mite-infested flour, exhibited by Robert Newstead.
34. Hermaphroditism in Pediculus humanus, exhibited by George Henry Falkiner Nuttall and David Keilin.
35. The effect of an accessory food factor (vitamine) on (1) the production of rickets in puppies, (2) the development of the teeth in puppies, exhibited by Edward Mellanby.
36. Aspidodrilus a remarkable Oligochaete of uncertain affinities and modified structure living as an external 'parasite' on an earthworm in West Africa, exhibited by Harry Arnold Baylis.
37. The relation of thyroid to metamorphosis, exhibited by Julian Huxley and Lancelot Thomas Hogben.
38. Thermopiles for investigating the thermal or the thermo-elastic properties of muscles, exhibited by Archibald Vivian Hill.
39. Living specimens of Simocephalus, exhibited by Herbert Graham Cannon.
40. Nerve end-cells in the pulp of the human tooth, exhibited by John Howard Mummery.
41. Recording porometer, exhibited by the Botany Department, Imperial College of Science and Technology.
42. Specimens from a factory of Neolithic stone axes at Graig-lwyd, Penmaenmawr, exhibited by Samuel Hazzledine Warren.
43. A large Palaeolithic implement from the gravel at Furze Platt, near Maidenhead, exhibited by Llewellyn Treacher.
44. Stalked echinoderms with a horizontal habit of growth, squeezes from Ordovician fossils, exhibited by Francis Arthur Bather.
45. Plaster casts of the atlas and another cervical vertebra of a gigantic aberrant Rhinoceros Baluchitherium osbornii from Miocene deposits in Baluchistan, exhibited by Clive Forster Cooper.
Ground Floor: Committee Room (Corridor):
46. Water hammer cone demonstrating the destructive effect of collapsing vortex cavities, exhibited by Sir Charles Algernon Parsons.
47. The concentration of minerals and coal by froth flotation, exhibited by Edwin Edser.
Meeting Room:
The following demonstrations will take place.
At 9.45 o'clock and again at 10.30 o'clock.
A short exposition (illustrated by lantern slides) of wireless telegraphy, exhibited by Alan Archibald Campbell Swinton, in connection with an experimental demonstration by the Marconi Wireless telegraphy Company Limited, from their works at Chelmsford.
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