Illustrated Catalogue Of Magic Lanterns (after November 1889, probably 1890)

70 MCINTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL., U. S. A. ^ ’ he gr ® ater the Pressure. As the gas in the bag dimin- hes, the pressure lessens, so that to maintain the light in its original brilliancy, additional weight should be added from time to time, or an adjustment of valves be made at first, so that they can be opened more wi e y as t re pressure diminishes. Never remove any of the weight from the bag while the light is burning. S To Start the Light when a Gas-bag is Employed. —See that all valves are closed; that the bag is properly weighted; that all con- nections are made as previously described, and that there is no leakage ot gas Draw the jet away from the condenser by rod C, adjust the lime, then open the key By, and next the stop-cock of the gas-bag • wait a second or two for the air to be driven out of the tubes, then gnite the mixture of gas and vapor which issues from the jet; let it burn two or three minutes to heat the lime, then open the oxygen key %°f C^wly); when this key is wide open, partly close the ether key ^ (very slowly) until the lime gives out the most steady and brilliant luminatior If there is a hissing sound heard, partially close the oxygen key Ox (very slowly) just sufficient to stop the hissing. If the light grows dimmer after two or three minutes, the ether key should be adjusted again. It will need no further attention except in a very cold room after evaporation of ether has considerably reduced the tern- p rature of the Saturator, when it may be necessary to open the By key almost wide toward the close of the exhibition. The light is best when the ether vapor is slightly in excess, which may be known by the orange tinge at the top of the flame. * Y flrS f Step i n extinguishing all forms of the Lime-light is to draw the jet away from the condensers. To Turn Out the Light when a Gas-bag is Used.— Close the Son c7 W^ S V hen ^ ether k£ y ff y ( ver y slowl y)J lastly, close the stoj>cock at the bag. Disconnect the Saturator immediately, and screw the metal caps over V, V, to avoid waste of ether. o Start the Light when Oyxgen is Supplied from a Cylin- der.— Open the ether key Afy first; then turn on the oxygen at the cylinder and ignite the mixture at the jet. When the lime is sufficiently warmed, turn the flame high, then open wide the oxygen key Ox, and turn on a little more pressure of the oxygen at the cylinder; adjust by very slowly closing the ether key By, until the best light is obtained When adjusted, the light may be increased or diminished within cer- tain limits, simply by turning the cylinder key. If there is a whistling or hissing of the flame, it may be caused bv oo great pressure on the gas, by a roughness in the platina tip of the ’ N cracks or holes in the lime, or the proportion of the gases in the flame may not be properly adjusted. To Turn Out the Light when Oxygen is Supplied by a Cylin- DER.—Open the ether key By wide, close oxygen key Ox, then the cylinder key (very slowly). y ’ Avold Snapping Out the Light Observe the Following -Rules : See that there is no leak in the burner, tubes or Saturator Always fill the Saturator before using, and use only a good quality of Wht n a fu f 11 fl flow . of . ox ygen gas, sufficient to produce a bright light. Dry out the cloth tubes at least once in two weeks, if the