41. Generally, the older Hammond drawbar organs had only preamplifiers and were connected to an external, amplified speaker. 42. Collets are compressed by a drawbar from behind, they are self releasing and tool changes can be automated. 43. Receiver-type hitches use removable ball mounts, whereas the fixed drawbar type hitches have integrated ball mounts. 44. The 9N weighed 2340 pounds and had 13 drawbar horsepower, which could pull a two-bottom plow. 45. A strong chassis is required to both support the extra ballast weight and pulling forces transmitted by the drawbar . 46. Typical ballast tractor configurations employ an independent drawbar trailer, modular wheel-trailer units, or dolly trailer. 47. The collets have a precision bore with axial compression slots for holding cutting tools and are threaded for the drawbar . 48. This design required that the drawbar passed beneath the firebox, and it typically heated to a cherry red color. 49. The vehicle is reversed slowly until the drawbar eye enters the bell, tripping the bolt and closing the coupling. 50. A "'drawbar "'is a solid coupling between a hauling vehicle and its hauled load.
