INDEX 



Air, Pressure of 230 



" Mode of weighing 239 



" Pump ..240 



" Hand listened by 241 



" Motion of. 245 



" Eesistance of. 247 



Alden's Cultivator 146 



Allen's Farm Mill 193 



Altitudes measured by the Barome- 

 ter ^43 



American Hay-tedding Machine. . . .165 



Apparatus for Experiments 281 



Aqueducts of the Romans 199 



Archimedean Root Washer 193 



Screw 217 



Archimedes, would move the earth 



with a lever 55 



Artesian Springs and wells 201 



Atmosphere, Height and Weight 



of 2.39,241 



Bags, How to cany 41 



Balance, a lever 47 



Balls, Why they roll easily 38 



Barometer 241 



Bars of w^ood. Strength of. 79 



Beardsley's Hay Elevator 177 



Bellows, Hydrostatic 204 



Bevel Wheels or Bevel Gear 60 



Billings' Corn Planter 155 



Binders for Reaping Machines 163 



Boat, Compound motion of. 20 



Broadcast Sower, Seymour's 154 



Brown's Wind-mill 251 



Brnsh Harrow 142 



Buckeye Mower 159 



Biillard's Hay-tedding Machine 165 



Bulk of a ton of different 6ubstances.210 

 Burrall's Corn-shellcr 191 



297 13* 



c 



Capillary attraction 3t 



" ' its great import- 

 ance . . 32 



Cayuga Chief Mower 160 



" " Dropper 162 



Cements, Effects of. 28 



Centre of Gravity 34 



" " curious examples 



of 35 



" how determined 35 



Centrifugal Force 21 



Chain Pump 221 



Cheese Press 72 



" ' Dick's 74 



" Kendall's 73 



Chimney Currents .253 



" Caps 254 



Chimneys, Construction of 254 



" To prevent smoking 256 



Churn with fly-wheel 17 



" worked by dog-power 191 



Cistern Pumps 219 



Cisterns, To calculate contents of. .237 



" Proper sizes for 238 



Clod Crusher 149 



" " CroskiU's and Ameri- 

 can 150, 151 



Cog, Hunting 60 



Cogs, Form of 58 



" and Cog-wheels 58 



Cohesion, Attraction of 27 



" between lead balls 27 



" weak in liquids 31 



Complex Machines, objectionable.. 116 



Compound motion 19 



" " How to calculate. 20 



Comstock's Rotary Spader. . . .148, 117 



Conducting power of bodies 260 



" liquids 261 



Corn Planter, Billings' 155 



" Sheller, Burrall's 191 



