![]() ![]() o the rest of the neck, and it must be prepared after a two-fold manner for first of all, the long neck of it being put perpendicularly into the small vessell, being full of water, so that it do touch the bottom of the vessell, we ought to mea∣sure from the superficies, or top of the water, and begin our division into degrees, still ascending upwards, till we come unto the very ball, be it round or ovall.Touching the Matras or Bolts-head, it is a round or ovall glasse, with a long and narrow neck, whose orifice, or mouth and nose, ought to bee propor∣tionable un Where also, their opinions are confuted, which deem and affirm, that the water is sucked up into the neck of the Matras by heat.įIrst, we must observe, that this our experimentall Instrument is composed of three parts, where of two of them are more essentiall, and proper unto the na∣ture of the Engin or Machin namely, the Matras, or Bolts-head, and the small vessell of water, into the which the nose or orifice of the Matras, after it is prepa∣red, ought to enter: and the other is more accidentall, as being onely ordained to sustain the glasse firmly, in his perpendicular position, and to adorn and set forth the Machin. Here the fabrick of this Organ or Instrument, properly termed the Weather-glasse, with the preparation of the Matras or Glasse, commonly called a Bolts-head, and the adaption of the Orifiace or Nose thereof, into a small vessell of water, is expressed. ![]()
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