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Title Telescope, Keuffel & Esser Co. 5010 made for experimental surface-to-air missile system, n.d, ca. 1947-1951.
Object Name Telescope
Catalog Number 2009.006.0165
Collection Keuffel & Esser Company Collection
Credit Museum Collections. Gift of a friend of the Museum.
Description Telescope, Keuffel & Esser Co. 5010 made for System X SAM-A-7, for Ordnance Corps, U.S. Army, no date, circa 1947-1951. Metal with white painted finish except on eyepiece and at mounting rings; black lettering both sides. 18-1/2" long x 3-1/4" high including level.

This telescope was made under contract for Western Electric Co. (a part of Bell Labs), the prime contractor for the Army on a defensive missile system, the XSAM or X SAM-A-7. X-SAM was the designation for Experimental Surface-to-Air-Missile and was the first successful one of its kind, ultimately being renamed and operationally deployed as the Nike Ajax. It was changed from X SAM to SAM in 1951. The telescope was apparently part of the systems for tracking/targeting. Exact use has not been determined. See notes.

Marked on left side: System. X SAM-A-7 | TELESCOPE | Part No. 8513258 | Serial No. 143717 | Ord. Corps., U.S.A.

Marked on right side: Keuffel & Esser Co. 5010 | GA-10372 | Western Electric.

Keuffel & Esser Co. main office and factories were in Hoboken in the period when this item was made.
Date 1947-1951
Year Range from 1947
Year Range to 1951
Search Terms K & E
Keuffel & Esser Co.
U.S. Army
Caption left side
Imagefile 070\20090060165.JPG
Notes The Western Electric SAM-A-7/M1/MIM-3 Nike Ajax

The Nike Ajax was the world's first operational surface-to-air guided missile system. Its origins lay in the immediate post-war time, when the U.S. Army realized that guided missiles were the only way to provide air-defense against future fast high-flying bombers. Western Electric became the prime contractor for the XSAM-G-7 Nike missile system and Douglas as the primary subcontractor was responsible for the missile airframe.

The first unguided Nike missiles were fired in 1946, but problems with the original multi-rocket booster (eight solid-fuel rockets wrapped around the missile tail) soon led to delays in the program. In 1948, it was decided to replace this booster pack with a single rocket booster, attached to the back of the missile. The main propulsion of the missile was a Bell liquid-fueled rocket motor, and the flight path was controlled by the four small fins around the nose. In November 1951, the first successful interception of a QB-17 target drone succeeded. The first production Nike (which had been redesignated SAM-A-7 in 1951) flew in 1952, and the first operational Nike site was activated in 1954. By this time, the missile had been designated by the Army as Guided Missile, Anti-Aircraft M1. The name had changed to Nike I, to distinguish it from the Nike-B (later MIM-14 Nike Hercules) and Nike II (later LIM-49 Nike Zeus). On 15 November 1956, the name was finally changed to Nike Ajax.

The Nike Ajax missile used a command guidance system. An acquisition radar called LOPAR (Low-Power Acquisition Radar) picked up potential targets at long range, and the information on hostile targets was then transferred to the Target Tracking Radar (TTR). An adjacent Missile Tracking Radar (MTR) tracked the flight path of the Nike Ajax missile. Using tracking data of the TTR and MTR, a computer calculated the interception trajectory, and sent appropriate course correction commands to the missile. The three high-explosive fragmentation warheads of the missile (in nose, center, and aft section) were detonated by ground command, when the paths of target and missile met.

One of the major disadvantages of the Nike Ajax system was that the guidance system could handle only one target at a time. Additionally, there was originally no data link between different Nike Ajax sites, which could lead to several sites engaging the same target. The latter problem was eventually solved by the introduction of the Martin AN/FSG-1 Missile Master command-and-control system, with automatic data communication and processing. Other problematic features of the Nike Ajax system were the liquid-fuel rocket motor with its highly toxic propellants, and the large size of a complete site with all components, which made Nike Ajax to all intents and purposes a fixed-site air defense system.

By 1958, nearly 200 Nike Ajax sites had been activated in the United States. However, the far more advanced MIM-14 Nike Hercules soon replaced the Nike Ajax, and by late 1963, the last Nike Ajax on U.S. soil had been retired. In 1963, the Nike Ajax had received the new designation MIM-3A. Despite the use of an MIM (Mobile Intercept Missile) designator, the mobility of the Nike Ajax system was more theoretical than actually feasible in a combat situation.

Classification Business & Commerce
U.S. Army