Image from page 121 of "Practical methods of organic chemistry" (1901) (14791513623)

Identifier: practicalmethods00gatt
Title: Practical methods of organic chemistry
Year: 1901 (1900s)
Authors: Gattemann, Ludwig. [from old catalog]
Subjects:
Publisher: [n.p.]
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

Text Appearing Before Image:
l at its upper end. Intothe tube lying in a horizontal positionthe copper oxide spiral is pushed sofar that its loop is 5 cm. from themouth of the tube (Fig. 60).Igniting the Copper Oxide. —The charged tube is placed in thefurnace, the end nearest the copper oxide spiral is closed by arubber stopper bearing the glass stop-cock tube, and the latter isconnected with the drying apparatus by means of rubber tubingprovided with a screw pinch-cock. The other end of the tubeis allowed to remain open at first; while a current of oxygen ispassed through the tube, slow enough to enable one to count thebubbles (the glass stop-cock is opened wide and the current regu-lated with the pinch-cock), the entire length of the tube is heated,at first with flames as small as possible ; these are gradually in-creased until finally, the tiles being in position, the copper oxidebegins to appear dark red. The water deposited at the beginningof the heating, in the forward cool end of the tube, is now removed
Text Appearing After Image:
Fig. 59. 103 5 cm. free) Short copper spiral 45 cm. coarse oxide Short copper spiralio cm. free 15 cm. copper oxide spiral 5 cm. freeFIG. 60.