[Illustration: U. S. Navy. Officers’ insignia of rank and Corps on collar of blue service coat, showing right side of collar 1. Officer of the Pay Corps with the rank of Rear Admiral 2. Naval Constructor with the rank of Captain 3. Professor of Mathematics with the rank of Lieutenant 4. Civil Engineer with the rank of Commander 5. Chaplain with the rank of Commander 6. Dental Surgeon with the rank of Lieutenant, Junior Grade] [Illustration: U. S. Navy. Warrant officers’ insignia on collars of blue service and dress coats, showing right side of collar 1. Chief Boatswain and Boatswain 2. Chief Sailmaker and Sailmaker 3. Chief Gunner and Gunner 4. Chief Pharmacist and Pharmacist 5. Chief Machinist and Machinist 6. Chief Pay Clerk and Pay Clerk 7. Chief Carpenter and Carpenter 8. Mate] Sailmaker—a diamond embroidered in gold. Pharmacist—a caduceus embroidered in gold. Pay Clerk—an oak sprig of three leaves and three acorns embroidered in gold. Mate—a binocular glass, embroidered in gold for a Mate of less than twenty years’ service and in silver for a Mate of over twenty years’ service. Chief Boatswains, Chief Gunners and Chief Machinists, being Line Officers, wear the gold star above the sleeve stripes; while Chief Carpenters, Chief Sailmakers, Chief Pharmacists and Chief Pay Clerks, being Staff Officers, do not wear the star on the sleeve. Boatswains, Gunners and Machinists, being Warrant Officers of the Line wear the gold star on the sleeve, but no stripes. Carpenters, Sailmakers, Pharmacists and Pay Clerks have the sleeves of the coat without decoration or insignia. Chief Boatswains, Chief Gunners, Chief Machinists, Chief Carpenters, Chief Sailmakers, Chief Pharmacists and Chief Pay Clerks wear on the collars of their blue service coats the same devices showing their corps as those already described to be worn upon the collars of their frock coats; and the same is true of the Warrant Officers, Boatswains, Gunners, Machinists, Carpenters, Sailmakers, Pharmacists, Pay Clerks and Mates. _Shoulder marks for officers_ are worn on the white service coat, mess jacket and overcoat to indicate the corps and rank of the wearer. These marks are of dark blue cloth lined with black silk, stiffened so as to lie flat, 4½ to 5¼ inches long and 2¼ inches wide, finished with a triangular point and a gilt Navy button at the collar end, and they are worn on the top of each shoulder extending from the base of the collar to the shoulder seam. The designs for the different ranks are as shown in the illustrations. For officers of the Line they are as follows: _Admiral of the Navy_—covered with gold lace braid two inches wide, with four silver stars, the two end stars being surcharged upon gold foul anchors. _Admiral_—covered with gold lace braid two inches wide, with four silver stars, the one nearest the collar end being surcharged upon a gold foul anchor.