I hope a request like this is allowed.
All of these items belonged to an ANZAC soldier who was in the Australia Artillery, WWI. They have been donated to a small private museum I work at. I don't normally deal with these types of items so I don't know terminology and am looking for assistance with that. Thank you.
From first glance number 7 is an epaulette, and 2 and 12 are shoulder pips, which would be worn on the epaulette (one can even be seen on it)
4 is a rising sun badge, but It looks a little small for the slouch hat. so perhaps it was used on the tunic? It does look like the third pattern, used from 1904 to 1949.
8 seems to be the Retired Member Insignia, but I'm not sure sorry.
I will have a closer look at some of the other stuff and try to get back to you soon.
Regarding 18: All I can tell you is that it from a ~35mm weapon of some sort, which means it is more likely an autocannon like the 37mm COW Gun or a Breech loader like the Vickers Q.F Mk II
15 is a badge and would usually be worn on a tunic or coat. The placement shouldn't really matter, but would most likely have been near the breast.
17 is similar to 15, and should have a date of issue in the red of the crown, however I cannot see one which would make me guess it was a very early one.
I'm not sure what the chains are, they could have been attached to the base of a revolver, but once again I am not sure.
5 is unusual, it seems to be a Gloucestershire Regiment rear cap badge- definitely not Australian Artillery. The Sphinx and Egypt represent the regiments actions in 1801 where they faced the French at the Battle of Alexandria, where on 21st March 1801 they defeated a major French push which like many other British regiments, won them the honour of having the sphinx and Egypt included.
That's about it from me I'm afraid, I hope this helps.