Xll CONTENTS. 



diameter of piston in the forcing pump, art. 127, equation (92), page 121. Practical 

 rule for ditto, art. 127, page 121. Safety valve introduced, art. 128, pages 121 and 

 122. General expressions established, art. 128, equations (93 and 94), page 122. 

 Example for illustrating the weight upon the safety valve, art. 129, page 122. 

 General expression for the weight upon the safety valve, art. 129, equation (95), 

 page 122. Practical rule for ditto, art. 129, page 123. Example for illustrating 

 ditto, art. 130, page 123. General expression for the pressure on the piston of the 

 cylinder, art. 130, equation (96), page 123. Practical rule for ditto, art. 130, 

 page 123. Example for illustrating ditto, art. 131, page 123. General expression 

 for the diameter of the safety valve, art. 131, equation (97), page 124. Practical 

 rule for ditto, art. 131, page 124. Example for illustrating ditto, art. 132, page 124. 

 General expression for the diameter of the cylinder, art. 132, equation (98), page 

 124. Practical rule for ditto, ib. Example for illustrating ditto, art. 133, page 124. 

 General expression for the weight upon the safety valve, art. 133, equation (99), 

 page 125. Practical rule for ditto, ib. Example for illustrating ditto, art. 134, 

 page 125. General expression for the pressure on the piston of the forcing pump, 

 art. 134, equation (100), page 125. Practical rule for ditto, ib. Example for 

 illustrating ditto, art. 135, pages 125 and 126. General expression for the diameter 

 of the safety valve, art. 135, equation (101), page 126. Practical rule fpr ditto, ib. 

 Example for illustrating ditto, art. 136, page 126. General expression for the 

 diameter of the forcing pump, art. 136, equation (102), page 126. Practical rule 

 for ditto, art. 136, page 127. Concluding remarks, ib. The thickness of the metal 

 in the cylinder determined, art. 137, pages 127, 128, 129, 130, and 131. Example 

 for illustrating ditto, art. 138, page 131. Appropriate remarks, art. 139, pages 131 

 and 132. A determinate and uniform value assigned to the pressure on a square 

 inch of surface, art. 140, page 132. Rules for the pressure in tons, and for the 

 diameter of the cylinder in inches, art. 141, page 133. Remarks on the theory, 

 art. 142, page 133. Examples for illustrating ditto, ib. and page 134. Remarks, 

 art. 143, page 134. Observations on presses previously constructed, with rules 

 and examples for examining them, art. 144 and 145, pages 134 and 135. The 

 description of the Hydrostatic Press, with its several parts and appendages, both 

 in its complete and disjointed state, arts. 146, 147, and 148, pages 136 142. 



The Hydrostatic Bellows and its uses introduced, art. 149, page 142. Descrip- 

 tion and principles of ditto, art. 150, pages 142 and 143. Practical rule for 

 calculating the weight of fluid in the tube, art. 151, page 144. Example for 

 illustrating ditto, ib. The solidity or capacity of the fluid in the tube determined, 

 art. 152, page 144. Altitude of the tube determined, art. 152, page 145. The 

 solution given generally, art. 153, page 145. Practical rule for determining the 

 height of the tube, art. 154, page 146. Illustrative example and remark, i&. 

 Weight on the moveable board determined in the case of an equilibrium, art. 155, 

 page 146. Practical rule and illustrative example for ditto, ib. Concluding- 

 remark, art. 155, page 147. The diameter of the equilibrating tube determined, 

 art. 156, page 147. Practical rule for ditto, ib.- Example for illustrating ditto, 

 art. 156, page 148. The diameter of the Bellows Board determined, art. 157, page 

 148. Practical rule and illustrative example for ditto, ib. When the equilibrium 

 obtains, if more fluid be poured into the tube, it will rise equally in the tube and in 

 the bellows, art. 158, page 149. 



The ascent of the weight on the moving board determined, art. 159, page 150. 

 Practical rule and example for ditto, art. 159, page 151. 



