Related for Niddah 51:42
תרתי
a handbreadth.<span class="x" onmousemove="('comment',' A handbreadth is equal to the size of four thumbs which equals that of four fingers plus. Hence the prescription that when 'held in one's hand', sc. with the four fingers, it must 'be seen at either end', i.e., it must slightly project to make up the required size. ');"><sup>39</sup></span>
Tosefta Rosh Hashanah (Lieberman)
If a horn was long and he shortened it, then it is fit. If he has scraped it inside or outside, it is good. Ha [a]he disguises it inside, it is useless ; [if he] has it [covered up] on the outside, then it is fit for purpose. Did [a]he disguise the mouthpiece or did he extended, even if [it happened] with [material] of the same kind, it is invalid. If it was punctured, and if [a]er [then] stopped it, even if [it was done] with [material] of the same kind, it is unsuitable if it prevents blowing; but if not, it is fit. If he has put two horns together and blown them, then when he has heard the sound of the inner one, he has done his duty; if he has heard the sound of the outside, then he has not fulfilled his duty. The size of the horn: that [d]er [bloa-ser] take it with his hand and blow kana
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