REPORT OF NATIONAL MUSEUM, 1!>19. 61 



mander's periscope for use in a trench or sliellhole for observation 

 purposes; a sitogoniometer used for rapid approximate measure- 

 ments and especially fitted for rapid preparations of indirect firing; 

 an aiming post used in the field as an auxiliary aiming point when 

 no suitable natural object is visible; a Jacob's staff used as a sup- 

 port for field glasses ; a pair of Wilson goggles with amber glasses 

 used by anti-aircraft gunners to protect their eyes when viewing a 

 target in the direction of the sun; a time interval recorder or stop 

 watch, used to correct the height or burst of shrapnel, to check the 

 time of flight of shells and also in various systems of sound and 

 flash-range finding ; a prismatic compass, clinometer and accessories, 

 used to ascertain the direction or course toward a sighted object, 

 or to measure the included angle between any two given points; a 

 tachyscope used in anti-aircraft fire for obtaining the speed of 

 an airplane and also for determining the wind velocity ; and a col- 

 lection of adapters and boosters, mechanical fuses and shell and 

 shrapnel, many pieces sectionalized. 



From the Chemical Warfare Service were received 12 large panels 

 installed with military gas masks and accessories showing in a very 

 complete and interesting manner the development of these objects by 

 the United States Chemical Warfare Service during the war. 



From the Quartermaster and Ordnance Departments were re- 

 ceived large collections of examples of the individual equipment 

 of the enlisted men of the various branches of the Army, including 

 infantry, cavalry, and artillery, such as clothing, mess outfit, 

 trench tools, haversacks, ammunition belts, and horse equipment. 



Among the battlefield relics and trophies received the following 

 are the most notable : From Gen. John. J. Pershing, United States 

 Ai'my (Chaumont, France), through the War Department, as a 

 transfer, the combined order of battle map and accessories used at 

 his headquarters at Chaumont during the progress of the American 

 military movements in France. This map was developed and kept 

 posted to date daily by members of the third section of the general's 

 staff and used by them and other superior officers during active op- 

 erations for strategical studies and purposes of general information, 

 and shows in a vivid fashion as at present installed the exact situa- 

 tion at the hour of the armistice, November 11, 1918. In general 

 this map gives the following information : Location of all divisions, 

 both enemy and allied, on the western front; correct battle line; 

 commanding generals; location of headquarters and army bound- 

 aries; and various other information concerning divisions, as, for 

 example, whether they were fresh or tired. As an aid to clearness 

 and in order to obviate the need of referring to a legend, national 

 flag designs were used on the map where possible in the make-up of 

 the tags. Those representing the American divisions are, however, 



