MACHINE FOR SAVING PERSONS &c. 143 



N". XV. 



Defcriptionof a Machine for faving T^erfoiis from the upper 

 Stories of a Honfe on fire, by Nicholas Collin, D. D. 

 the Inventor ; 'with a Drawing from the Model, 



ead Nov. 7 

 ♦. 1791- i 



ABCC is a trunk with a focket from top to 

 bottom, and two pulleys ^, a in the fides 

 C, C In this the cylindrical Ihaft Dli moves, Supported 

 on the pulleys by two ropes. Thele are by one end 

 tacked to the foot of the fhaft, and by the other to the 

 axes of the windlafles J, I, which iland below. The 

 cranks, winding the ropes round the axes, lift the foot of 

 the fhaft to the pulleys, and by unwinding let it down 

 to the bottom. t 



FEG is a lever, turning on its fulcrum, Vv^hich is fixed 

 in the top of the fliaft, by the iron tire d. The long arm 

 is preiTed by the frame at its end : the fhort one is held 

 in balance by the rope GH, which is faftened on the 

 bafe of the machine. As the lever defcends with the 

 fliaft, the rope llackens on the fhort arm ; then the other, 

 no longer balanced, defcends round the fulcrum, and by 

 this motion turns the fhort one upwards tight againft the 

 rope. Their angular contrary movements continue thus, 

 until the Ihaft reaches the bottom of the focket j and the 

 bafket at the fame time comes to the ground. 



The bafe is a rectangular plank floor with a corn- 

 pad: frame underneath. The trunk is fixed in it, by 

 feveral bracers r, and other ufual fafiening, both above 

 and below, ftanding fomewhat from the centre towards 

 the rope GH, in order to counterad: its raifing that 

 end. 



The windlafles are firmly fet in the floor, aear the 

 trunk, diredly under the pulleys. 



T 2 The 



