Description of a glass apparatus, for making mineral waters ... together with the description of some new eudiometers, or instruments for ascertaining the wholesomeness of respirable air ... in a letter to Dr. Priestley / [João Jacinto de Magalhães].

  • Magalhães, João Jacinto de, 1722-1790
Date:
1779
Catalogue details

Licence: Public Domain Mark

Credit: Description of a glass apparatus, for making mineral waters ... together with the description of some new eudiometers, or instruments for ascertaining the wholesomeness of respirable air ... in a letter to Dr. Priestley / [João Jacinto de Magalhães]. Source: Wellcome Collection.

    18/68 (page 6)
    ( 6 ) Description of the Simple Glass- Machine. 5. ABC (fig. 1,) reprefents one of the im¬ proved machines of Mr. Parker, {landing upon a wooden difh d e, in order to avoid any water, if fpilled, from falling on the table. The middle veffel B has a neck, which is in- ferted into the mouth of the veffel A, being nicely ground air-tight to it. This lower neck of the middle veffel B, has a flopple V of glafs, compofed of two parts, both having holes, fufHcient to let a good quantity of air pafs through them: between thefe two parts is left a fmall fpace, containing a plano-convex lens, which adrs like a valve, in letting the air pafs from below upwards, and hindering the fall of the water into the veffel A. 6. The upper veffel C terminates below in a tube, marked 2, 1, (fig. 1,) which being- crooked, hinders the immediate paffage of the bubbles of fixed air into the upper veffel C, before they reach the furface of the water in the veffel B. The veffel C is alfo ground air-tight to the upper neck of the middle vef¬ fel B; and has a flopple w, fitted to its upper mouth, which either is perforated through the middle, as w and i (fig. 1 and 2); or is of a conical