SCHOOL APPARATUS. 



283 



Also, Pike's elegant Lever Air-Pumps, 4 feet high, price $63, or with 

 gauge, $70 ; larger Double-Barrel and Lever Air-Pumps, and more 

 extended apparatus constantly on hand. 



SET OF APPARATUS FOR HYDROSTATICS. PRICE $45. 



1. Hydrometer ...--- 



2. Tube for Relative Weight of Fluids 



3. Level and Plumb-Level - 



4. Syphon with Drawing-Tube - 



5. Wirtemberg Syphon 



6. Tantalus Cup ..... 



7. Hydrostatic Equilibrium - 



8. Lifting-Pump 



9. Forcing-Pump ------ 



Frame for Pumps - - - - - 



10. Hydrostatic Bellows 



11. Spouting Fluids 



12. Barker's Mill 



13. Archimedes Screw 



14. Upward and Downward Pressure of Fluids 



$050 



- 1 50 



1 25 



- 075 

 75 



- 2 00 



2 50 



- 3 50 

 5 00 



- 1 50 

 5 00 



- 500 

 500 



- 900 

 200 



$4525 



