Translations for pair of compasses in French

Here are paragraphs from public domain books translated:

A strong smell of tobacco and tar arose from the interior, but nothing was to be seen on the top except a suit of very good clothes, carefully brushed and folded. They had never been worn, my mother said. Under that the miscellany began—a quadrant, a tin canikin, several sticks of tobacco, two brace of very handsome pistols, a piece of bar silver, an old Spanish watch, and some other trinkets of little value and mostly of foreign make, a pair of compasses mounted with brass, and five or six curious West Indian shells. It has often set me thinking since that he should have carried about these shells with him in his wandering, guilty, haunted life.

Un fort relent de tabac et de goudron s’échappa du coffre, mais on n’y voyait rien, au premier abord, qu’un très bon habit complet, soigneusement brossé et plié. Il n’avait jamais servi, au dire de ma mère. Dessous, le pêle-mêle commençait : un quart de cercle, un gobelet de fer-blanc, plusieurs rouleaux de tabac, deux paires de très beaux pistolets, un lingot d’argent, une vieille montre espagnole et quelques autres bibelots de peu de valeur, presque tous d’origine étrangère, un compas de mathématiques à branches de cuivre et cinq ou six curieux coquillages des Indes occidentales. Je me suis demandé souvent, par la suite, pourquoi il transportait avec lui ces coquillages, dans sa vie errante de criminel pourchassé.

Treasure Island, by Robert Louis Stevenson

L’Île au trésor, de Robert Louis Stevenson