The Alcock collection consists of over 2000 glass slides. The series within the collection, called "Images of early Brisbane", includes images of buildings, landmarks and views of Brisbane, including the 1893 floods. Also images of University of Queensland in its early years.

Kerosene-fuelled magic lantern projector [possibly made by John Browning of The Strand, London circa 1885], 7 wooden mounting frames for use in projector, 24 glass slides [some of Melbourne, circa 1890s?].
Glass slides are mostly colour and 8 x 8 cm, supplied titles in square brackets:

1. [Lantern slide, with drawing of a rooster, undated]. --
2. [Lantern slide, with illustration depicting a cat peeping over table at rats eating a cake, undated]. --
3. [Lantern slide with text of 'Rule, Britannia' by James Thomson, undated]. --
4. [Lantern slide, with illustration of sparrows, undated]. --
5. [Two brown treecreepers perched on a chopped tree trunk fixed to a base, undated]. --
6. [Carnations, undated]. --
7. [Carnations, undated]. --
8. [Carnations, undated]. --
9. [View of the Upper Ward towards the northwest, with George IV gateway at the extreme left, Windsor Castle, Berkshire, England, undated]. --
10. [View of unidentified building, road in foreground, unidentified location, undated]. --
11. [Lantern slide, with illustration of a castle by a river, showing a boat in the foreground and a bridge, trees and bird flying in background, undated]. --
12. [Sculpture, bust of woman, undated]. --
13. St Kilda foreshore, Melbourne, [ca. 1914?]. --
14. [View of unidentified street, unidentified location, c1900 - ?]. --
15. Railway Buildings, Spencer Street, [Melbourne, undated]. --
16. [View of trams on tram track, Melbourne, undated]. --
17. Botanic Gardens [with view of Government House from lake, Melbourne, undated]. --
18. Coburg gardens, [Melbourne, undated]. --
19. Camberwell, TH GDNS [gardens?], [Our Lady of Victories in background, Camberwell, Victoria, Australia, undated]. --
20. [View of Place de la Bastille with Colonne de Juillet at centre, Paris, undated]. --
21. Blank slide. --
22. [Four hand painted scenes].