The movements of consonants were studied first by the Danish scientist Rusk, and then in more detail by the German scientist Jacob Grimm. As it turned out, the sounds characteristic of Indo-European languages have changed in the Germanic languages. The law of movement of consonants by Jacob Grimm had three stages or acts.
The first act consists in the fact that Indo-European deaf occlusive sounds turn into deaf slotted ones: p, t, k → f, h, h. Examples: ped / pod → Lat.- pes →in Gothic- fotus →in old Eng.- fot → English -"foot"; treies → lat.- tres → Goth.- treis→ old English - trie →Englisn -"three"; kuon → lat.- canis → Goth.- hunds → OE - hund→ English – "hound" (dog).
The first act consists in the fact that Indo-European deaf occlusive sounds turn into deaf slotted ones: p, t, k → f, h, h. Examples: ped / pod → Lat.- pes →in Gothic- fotus →in old Eng.- fot → English -"foot"; treies → lat.- tres → Goth.- treis→ old English - trie →Englisn -"three"; kuon → lat.- canis → Goth.- hunds → OE - hund→ English – "hound" (dog).
The 2nd act consists in the fact that the voiced occlusive aspirants turn into simple ones: b, d, g → p, t, k. Examples: dheubos → Gothic - diups, OE - deop, Eng.- deep; dekm→ Lat.- decem, Gothic- taihun, OE - tien, Eng.- ten.
The 3rd act consists in the fact that Indo-European voiced stops turn into voiceless stops: bh→ b - v, dh → d - th (there), gh → g.
