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The photographers stamp on the photograph reads Exchange Studios 49 Pitt St. Sydney WARD & FARREN Proprietors.
The machine drive, as with the previous machine shop images is via belts driven by pulleys in the ceiling. The system of providing drive power via shafts and pulleys in the ceiling is probably a leftover from the steam engine era. After the steam era the ceiling system continued with electric motors driving the shafts. There is an interesting item near the most prominent machine in the room, to the right and rearward of the man in the foreground with the light coloured shirt, being operated by the second most prominent person in the room in a dark shirt. To the left of the upper part of the vertical cylindrical section of the prominent machine, is a lever dangling down from the ceiling with a hand-grip at the bottom end of it. This lever is pivoted about two thirds of the way up it, at a bracket attached to a lower roof beam and extends further up to a higher beam, where it is connected to a set of linked levers. This set of levers controls the machinery in the roof that contains the drive pulley and belt that comes down to a drive pulley on the prominent cylindrical machine originally mentioned. Presumably this lever either totally disengages the drive power from this machine or is a means of speed control for the machine or both.
The ladders mentioned previously, appear here yet again, probably related to the need to attend to the drive pulleys on the ceiling.
This is the last of the photographs that are annotated with "N.B". Presumably this does not refer to Nota Bene, possibly someone's initials or a place. Whoever, wherever or whatever N.B. is, it seems to group these photos together, probably chronologically. As previously speculated, it might stand for New Building if this photo was taken shortly after the move from Alice Street Newtown to Chalmers Street in the Sydney CBD in 1933/34. The images in this and the previous three images in the photo gallery including the images of the carpenter's shop and the blacksmith's shop are probably in the same building.
Neville Mitchell, a long serving Automatic Totalisators manager, made the following observation of the belt drive system: The noise level was high with so much equipment rotating. The 100 mm wide leather drive belts flapped about making their contribution to the general noise level, they were all flat leather with overlapping joints that added to the shop noise.
Image Source: Powerhouse Museum Sydney
Above is a WWII Gun-sight, an example of the munitions produced at this factory during the war which was mentioned above the image at the top of this page, however this is not an example of heavy engineering which would require the heavyweight machines in the machine shop in the image at the top of this page.