Pic15. What the?

This is a comparative Brinel hardness tester. A square bar of calibrated known harness is inserted in the square hole between the ball and the punch body. The ball is positioned on the component to be hardness tested and the tool is struck with a hammer the square test bar is removed and the hemispherical mark left on the test bar and the component are measured for diameter and the values are cross matched on a table to give the HBN number. These tools are still very common.

Thanks to Michael Slattery and Ian Speer for identifying this one.

Pic14. What the?

Pic 13.

The item is a “Ring Cutter” Generally used in hospital emergency departments for safe removal of rings. Especially when there is swelling due to trauma. Hook piece slips between ring and finger, light pressure applied by thumb on plate. Rotate wheel until ring cut. Metal blade cannot cut finger. (Trevor Jones)

Pic12. The part that holds the cranked piece telescopes in on a spring

Pic 11 - Another whatsit - marked BONUM 2001. The pointed end looks like a short piece of star picket.

Feedback #1: The Bonum 2001 is a general purpose scraper, the blade (star picket) should be located centrally in the head of the handle. It should be sharpened on a grinding wheel with final finishing on a flat stone to give a micro bevel. It works a treat with three cutting surfaces to be dulled before resharpening. I obtained mine from the deceased estate of a timber boat builder.(Gordon Lewins)

Pic 10- Another whatsit - marked BONUM 2001. The pointed end looks like a short piece of star picket.

Pic 9- Cast iron Ox-bow pin.

"Feedback - this is an Ox-bow pin in the open position. It was used on the old wooden ox-bows to retain the 'U' shaped bow in the yoke - Tom Partington USA." (see also below two pics)

Pic 8 - Cast iron Ox-bow pin.

Pic 8b - Diagram of an Ox-bow

Part of an Ox-bow picture from the website shown below:

http://prairieoxdrovers.com/yokes.html

Pic 7 - Some sort of gauge, from the electrical / electronics industry, going by the name EMF. See also below.

The item pictured on your whatsits page is a welders Fillet gauge. It is a unit still in use today to measure the fillet size of what you would call a Tee weld. Fillet weld size determines cost pricing on welded work of large proportions as well as distortion control.
The would have been imperial dimension units but later models would of course been in metric. The EMF brand was a British company manufacturing welders and electrodes and ancillary equipment.

Grahame Collins

Interesting Gadget - Pic 3- but what exactly is it? Feedback from Graham Clegg, Powerhouse Museum, Sydney, Australia:
The item is a tool used to fit wire hook type belt fasteners to flat transmission belting. The hooks come on a paper card --in use the hooks fit into the brass divisions and are secured there by the loose pin. The belting is placed between the sharp pointed ends of the hooks and the hooks are squeezed shut in the jaws of a vyce, embedding the fastener hooks in the belt."