Boyd’s Bible Dictionary:

(pipe). A wind instrument with a flaring mouth, made of horn or metal and differing but little in form and use from the cornet (Ex. 19:16). [CORNET.]

Concise Bible Dictionary:

These were made of rams’ horns and perhaps of the horns of other animals. They were used on joyful occasions, and at the wars. There were two trumpets made of silver which the priests used, and instructions were given as to blowing different sounds for calling the princes together, or for summoning all the congregation, or as an alarm for war (Num. 10:1-10: Compare 1 Cor. 14:8). At the dedication of the temple Solomon had a hundred and twenty priests sounding with trumpets (2 Chron. 5:12).
The use of trumpets set forth the public proclamation of God’s rights in His people, whether in their direction or in their relationship with Him.
At the giving of the law there was a loud voice of the trumpet proceeding from the mount, exceeding loud; so that all the people trembled (Ex. 19:16,19; Heb. 12:19).
When the Lord Jesus comes to fetch His saints it will be with the voice of the archangel and with the trump of God (1 Thess. 4:16). The “last trump” will sound at the resurrection of the saints (1 Cor. 15:52). In the Roman army, when it was about to start, the trumpet sounded three times: at the first trumpet they pulled down their tents: at the second they put themselves in order; and when the last sounded they started.
In the judgments that are to fall upon the earth, as foretold in the Revelation, the Seven Seals introduce the Seven Trumpets: the first four fall upon the Roman earth, and refer to the state and circumstances of men; the latter three trumpets refer to the East, and fall upon the persons themselves. The Trumpets come in between the Seals and the Vials (Rev. 8:2—Rev. 9:14).

From Manners and Customs of the Bible:

Psalm 98:6. With trumpets and sound of cornet make a joyful noise before the Lord, the King.
1. Chatsotserah, “trumpet,” was a long, straight, and slender wind instrument, such as Moses was commanded to furnish for the service of the Israelites (Num. 10:2). Josephus gives this description of it: “In length it was little less than a cubit. It was composed of a narrow tube, somewhat thicker than a flute, but with so much breadth as was sufficient for admission of the breath of a man’s mouth; it ended in the form of a bell, like common trumpets” (Antiquities, book 3, chap. 12, ยง 6).
The chatsotserah was used for notifying the people of the different feasts, for signaling the change of camp, and for sounding alarms in time of war. See Numbers 10:1-10; Hosea 5:8. It was at first used in sacrificial rites only on special occasions, but in the time of David and Solomon its use for such purposes was very much extended.
It is impossible to give an accurate description of the shophar, here and in other passages rendered “cornet,” but often translated “trumPeter” Our translators render it “trumpet,” except when, as in the text, they are compelled to make a distinction between it and chatsotserah, which they invariably render “trumPeter” See 1 Chronicles 15:28; 2 Chronicles 15:14; Hosea 5:8. It is translated “trumpet” in Exodus 19:16; Leviticus 25:9; Job 39:25; Joel 2:1; Amos 2:2.
Authorities differ as to its shape, some supposing it to have been straight, while others contend that it was more or less bent like a horn. The latter opinion would seem the more probable from the fact that the “horn,” (keren,) in Joshua 6:5, is elsewhere throughout that chapter spoken of as a shophar, or “trumPeter” From its name, which means “bright,” or “clear,” the shophar is thought to have had a clear, shrill sound. It was used for announcing the beginning of the year of jubilee, and for other ceremonial purposes; for calling the attention of the people to important proclamations; for declaration of war; and for demonstrations of joy. See Leviticus 25:9; Judges 3:27; 1 Samuel 13:3; 2 Chronicles 15:14; Isaiah 12:3.

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