Answer: these are to help bats orientate themselves, until the trees are larger. Did they recently cut down trees along this road? Bats need to hear reflection of their sound to know where they are going. These things will replace the leaves in that.

Answer: It is a Campbell-Stokes sunshine recorder. You place a strip of card into one set of grooves in the piece that curves behind the sphere, point the opposite side of the sphere towards the equator, and the sphere will focus the sunlight to burn a track on the card. The card has hours marked, and more the card is burnt, the brighter the sunlight was.

Answer: Stingray teeth

Answer: It's a frequency scanner. Often used by car thieves. These can read the codes from that distance and enable thieves to get into your vehicle, disable the security features in the process, and drive away with your car.

Answer: Fire beaters. Used to extinguish small fires

Answer: they’re good luck/prayer charms that are tossed in the water on purpose.

Answer: It is a fish crib. It is a device to give baby fish a place to hide from the big boys. They also make for some good fishing as the lunckers will hang around hoping for a few little ones to come out

Answer: Artillery expert here

What you have there is a projectile from the 35x228mm Oerlikon Flab Kan 63/90 (Same gun that is on the Flugabwehrkanonenpanzer Gepard).

From the fact it has an aluminium dummy fuze (the large cutouts make it obvious there is not enough space for the fuze mechanism) and it looked like it was painted bluish-grey, that makes it an "Übungsgranate" - a Target Practice shot. Be advised that doesn't mean it's inert, because even a TP shot can have active pyrotechnic devices like tracers and I can't see the bottom of it.

My advice, is, as always, call EOD (Explosive Ordnance Disposal, AKA the "bomb squad") and they'll sort it for you, because you don't do demining over the internet.

Answer: They have these in violins. They call them the mouse. It’s just years and years of fluff and detritus. If they get repaired the repairer will put ‘the mouse’ back into the violin for good luck. It could be something like that.

Answer: Pit mine, the spiral you see is the actual road trucks drive on to transport the materials mined from the bottom to the top.

Answer: This is for horse mounting.

Answer: It says "International Correspondence Schools" which still exists.

Probably a course on chemicals?

Now, be careful. Chemical regulations in the 20's were not the same as now. Based on your pictures, you could have nasty toxic chemicals that can go through a glove and kill you (the mercury vial), explosive degradation products (ammonium) and other surprises like that. Earth near from them could be contaminated too.

I suggest you do not linger near from them. Perhaps you can arrange a meeting with a university chemical lab and know more about the set, including safe disposal options.

Answer: It's for bees, particularly Mason bees

Answer: it's a clockwork spit turner for turning a roast or other meat automatically.

Answer: these are nets for catching the fruit from the tree - currently rolled up because there is no fruit. They were spread out to cover the area beneath the trees when I was there in late summer.

Answer: This is 100% frayed edges of the conveyors that take the crackers through the sheeting process before being transferred to the oven band.

Answer: This is very common in Germany, we call it "Wechselbad". You're supposed to keep your feet in the warm water first and then quickly put them in the cold water (repeat a few times). This is supposed to help with circulation although I'm not sure if there's actually scientific evidence for that.

We usually have these in spas and other wellness or health related facilities.

Answer: it's a byproduct of burning rubbish with a high iodine content

Answer: Its a promotional key ring for a company that makes glass eyes for taxidermy

Answer: They are cooling vests

Answer: Bat house

Answer: a hip bath

Answer: Home made horse fly trap

Answer: Previous tenant smoked w a fan in the window. I’ve seen this so many times turning over apartments for work.

Answer: this is likely to be a prehistoric or Roman quernstone

Answer: a Lebanese loop used in atm fraud

Answer: Looks like a bed warmer. You put hot coals/embers in it and move it over your sheets (like an iron) to warm the bed up.

Answer: the things attached to a garter belt to hold up stockings

Answer: a water reserve for fire fighting

Answer: Cling filmed ice packs

Answer: It's a butter pick.

Answer: It is for punching holes in leather or similar things. Like, for a belt

Answer: Nested set of seven plated medical cervical dilators

Answer: It's a capped off gas line from when they used gas lighting.

Answer: Funnel for making a portugese sweet called "Fios de Ovos" or egg threads.

Answer: That’s a taco holder.

Answer: rat/rodent poison.

Answer: The three prong ones were for TV and FM antennas, and the center one was for an antenna rotator, to get better reception.

Answer: Large Ship bumper/fender. The are Used to keep huge ships from smashing in the pier.

Answer: Styrofoam, but if you cut it in half, you should be able to determine if it's a spider egg or Styrofoam pretty easily

Answer: grain mites

Answer: It is a laryngoscope

Answer: New age "healing" stuff, like the magnetic bracelets and such.

Answer: It's to slice bread

Answer: These are blinders, typically used so the sign can old be read from a narrow angle. They're also called directional shields. You'll see them on traffic lights a lot more often.

Answer: It is a slate dish for grinding flux.
Back in the day, you put a little water in it and rubbed a borax cone in it to make up the day’s flux.