diametral spines crossed loosely in the centre of the spherical or irregular roundish central capsule.
Diam′etrally, in a diametral manner; Diamet′rically, exactly.
Of course every diametral spine pierces the capsule twice, at two points diametrically opposed.
On the other diametral side of the coupling the strain due to the key is exerted on the top face of the key.
Supposing you wanted to know the number of teeth in a gear where the pitch diameter and the diametral pitch are given.
The circumferential pitch is of course got by dividing the diametral pitch by π.