Mrfcellmeci Curio fa. 197 



half above it. The perpendicular End of 

 the Cylinder DC was clos'd with an Object 

 Glafs of a feventy lixth Foot Telefcope 00 ; s 

 and the other end AB, with a well poll Of d 

 flat Glafs ff, which was carefully chofen to 

 tranfmit the Object diftinft enough notwith- 

 ftanding its Obliquity to the Vifual Rays. 

 The Ferules were well filfd with Cement 

 round about the Edges of the Glafs, and they 

 laid flat and every where touched the fmooth 

 Ends of the Cylinder, that they might firm- 

 ly refill: the prefTure of the excluded Air. 



Inftead of a Cittern (as in the Torricellian 

 Experiment) we made ufe of the Inverted 

 Siphon of Brafs (ftg. 34O MNO, foder'd to 

 the Plate ggg. One of the fides MN Hood 

 perpendicular to the Plate, arid the other 

 fide 2SJO enclinM to it, and was fupported- 

 near the upper end O with a little prop Kk* 



We then plac'd the Cylinder (as in 5.) 

 upon a Table which was well faiten'd to a 

 firm Floor \ the Pipe GH was let through a 

 hole, and the Axis laid almoft parallel to the 

 fides of the Table, and the Plate ddd was 

 naiPd down to it. The Tube of the Tele- 

 fcope //, with the Eye-glafs, was apply'd to 

 the Object Glafs, and a Hair fix'd withia 

 it at the common Focus of both Glaffes in the 

 Axis of the Cylinder continu'd, x. Upon the 

 Floor (under the Cylinder) we naiFd the 

 Plate ggg with the Inverted Siphon upon it, 

 and join'd M to H by the Infection of the 

 Glafs Tube T. The Joints were very care- 

 fully clos'd witlr Cement: And then they 

 ,wej*e cover'd over with pieces of a Bladder 

 and wrapt hard with ftrong Thread. There 

 O 3 was 



