Manchester Memoirs, Vol. lix. (1915), No. \%. 23 



Part II. 

 John Dalton's Natural Philosophy Diagrams. 



Mechanics. 

 Sheet 1. 



(17" broad x 21" high.) Three diagrams illustrating 

 the principle of the lever. 



Sheet 2. 



(32 // X2i // .) Four diagrams illustrating the pressure 

 on fulcrums and supports. 



Sheet 3. 



(22" x 31".) Three diagrams relating to the pressures 

 produced when beams are suspended horizontally. 



Sheet 4. 



(13" X 19".) Three diagrams illustrating the inclined 

 plane. A weight of 12 units is shown balanced by 3, 4 or 

 6 units according to the inclination of the plane. 



Sheet 5. 



(21" x 17".) Two diagrams illustrating statical prin- 

 ciples. 



(1) Three equal forces act at an angle of 120° on a body. 



(2) Forces of 14, 8 and 15 act on a body. 



Sheet 6. 



A large diagram (34 // X4i // ) illustrating the principle 

 of moments. Weights are suspended at three points on 

 the circumference of a disc which is pivotted about a 

 central horizontal axis. 



Sheet 7. 



(20" X 16".) Relates to the parabolic path of projectiles. 



