
SOURCE: Mishkan Ministeries.
Provides the following explanation on the site:-
“The two silver trumpets were used to announce removal of the camp, special festivals, the Year of Jubilee, war, or any other notable event (Numbers 10:2-10), which were to be a single piece (probably manufactured like the pipes of the candelabrum). They were straight as represented on the Arch of Titus where they are exhibited as about equal to each other in average diameter.”