Originally Posted by VanillaBean
So then, what makes a dogbone french link (Im assuming it is dogbone because of the shape/angle) different from a Dr.Bristol?
A french link snaffle's most noticable differences from a Dr. Bristol are first of all it's curved shape (hence the reference to a dog bone) and second of all the angle at which it links into the rest of the snaffle. The french link is connected in such a way that it lies in the same plane as the cheekpieces.
The Dr. Bristol has a larger, flat shaped link and it is angled 45 degrees from the plane of the cheekpieces. These two features mean that the bit is quite harsh and gives tongue/palette pressure when applied.
Other variations to the linked bit include a bean link, a KK link, and others and are usually legal.