The Journal of hygiene (1901) (14576851670)

Identifier: journalofhygiene01nutt (find matches)
Title: The Journal of hygiene
Year: 1901 (1900s)
Authors: Nuttall, George Henry Falkiner, 1862-1937
Subjects: Hygiene
Publisher: Cambridge University Press
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto



Text Appearing Before Image:
me Office Committee on Ventilation of Factoriesand Workshops, and the apparatus, the construction of which is shownin the figure, is a simplified form of a gas-analysis apparatus which Idescribed in 1898*. The practical advantage of the method is thatthe apparatus can easily be carried about, and is always ready for 1 Journ. of Physiol,, Vol. xxu. p. 465, 1898. The more important measurements connected with the present apparatus are asfollows :— Internal measurement of case 8 x 13 x 3 inches. ,, ,, ,, water-jacket 2; X 1^ X 7 inches. Diameter of bulbs about 1^ inches. Length of graduated part of burette about 4 inches or 100 mm.Thickness of wood used throughout = f inch.Weight, including mercury and water, about 6 pounds.The apparatus has been made for me by Messrs C. E. Muller and Co., 148 HighHolborn, London. 110 A Rapid Method of determining Carbonic Acid in Air immediate use: that an accurate result can be obtained within aboutfive minutes; and that no calculations are involved.
Text Appearing After Image:
One-fourth actual size. The gas burette A, which is enclosed in a water-jacket, consists ofa wide uugraduated, and a very narrow graduated portion. It holdsabout 20 c.c. from the tap to the bottom of the scale. The graduatedpart, which is about 4 inches long, is divided into 100 divisions, each of which corresponds to _ 1 _ 1TT0(T0 th part of the capacity of the burette. The lowest division is marked 0, and the highest 100. Anydifference between a reading at or near zero and a second reading isthus shown by the scale in volumes per 10,000. J. Haldane 111 In using the apparatus the air is first expelled from the gas-buretteby opening the three-way tap B to the outside, and raising the mercurybulb C. The tap is then closed, and the mercury bulb replaced in itsstand. On opening the three-way tap again a sample of the air isdrawn in, and the level of the mercury falls to near the zero mark.The tap is now opened towards the absorption pipette D, which is filledup to a mark at E with potash