RECORDS OF MEETINGS OF 1909 
285 
SECTION OF ASTRONOMY, PHYSICS AND CHEMISTRY. 
January 18, 1909. 
Section met at 8:15 P. M., Vice-President D. W. Hering presiding. 
The minutes of the last meeting of the Section were read and approved. 
The following programme was then offered: 
0. W. Willcox, Cylindrogenite, a Possible Representative of a 
Cylindrical (Non-Hauyan) Order of Crystals. 
D. W. Hering, Orthopedic Photography; Notes on the Rectifi¬ 
cation of Distorted Pictures. 
William Campbell, Some Notes on Western Smelters. 
Summary of Papers. 
Dr. Willcox described a remarkable new form of limonite which occurs 
in the Red Bank sand of the Upper Cretaceous of New Jersey. It occurs 
normally as perfect cylinders which may be either hollow or solid, terminated 
at either end by a cone or a hemisphere. It is suggested that they are 
representatives of a non-Hauyan order of crystals — the cylindrical system 
as distinguished from the cubical and other systems of the Hauyan order. 
Professor Hering discussed the defects common in kodak pictures, which 
arise from badly timed exposures in various conditions of light, resulting in 
excessive inequalities of light and shade. In printing from such a negative, 
if the source of light is small, these faults can be corrected to a great extent 
by holding the printing frame in such a position that the distance to different 
parts of the negative gives different intensity of illumination. He also 
considered the distortion of pictures arising from using a short focus lens and 
holding the camera at an awkward angle. By rephotographing the distorted 
picture, placing it before the camera at an angle to the axis of the lens, a 
counter distortion is effected which may rectify the picture. He illustrated 
the various stages by lantern slides. 
Professor Campbell spoke on the evolution of the western lead smelters 
through changes of conditions and improvements in practice. A photo¬ 
graph of the Globe smelter, Denver, showed the location of the main build¬ 
ings. A plan of the plant showed the location of receiving-tracks, bins for 
fuel, fluxes and ores, beds, the long-hand-reverberatory, Brown-O’Harra, 
Bruckner and H. and H. roasters, blast furnaces, matte settling reverber- 
