How to measure a dovetail slot and it's mating component?

dovetail slot
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Multi-function dovetail slots for optical telescope and finderscope, solid all metal construction ultra-thin design, ultra-light weight

Dovetail slots are essential structural cut-outs made in compressor disc to assemble blades Under in-service centrifugal loading and Introduced in the 1930's, the Dovetail Anchoring System continues to provide anchorage for masonry walls attached to concrete backup walls with a cast-in-place

gram slot kaffebord V29 28x28mm Stainless Steel Dovetail Slot Cast In Channel - 3m Code: V1380001 - Please login to purchase Product Description Product Features  Cylindrical Scale Vertical Right Angle Dovetail Slot With Rod Screw Carriage Slide Table Pallet L-type Lifting Slide No 1 Material: gray cast iron