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Section of photography and microscopy
474
Sections.
[J. F. I.
Mr. U. C. W a n n e r presented a communication on " Some E x p e r i m e n t s in Stand or Tank Development," which was illustrated by the exhibition of a number of negatives and prints made from negatives developed in tanks with dilute developer. Mr. Martin I. Wilbert addressed the meeting on " T h e Use of Lantern Slides as an Aid in Object Teaching." The speaker illustrated the subject by shovcing a number of slides (loaned by Prof. Jos. P. Remington) exhibiting botanic and pharmacologic objects colored by students of the St. Louis College o f Pharmacy. Mr. Howard W. DuBois exhibited a number of artistically colored slides and made some remarks on the method of col.oring. Dr. Leffmann exhibited a number of shdes representing typical desert vegetation. M. I. WILBERT,
Secretary.
SEcTio~cs.--3/Zeeling, Thursday,
April 23d. Mr, Jesse Pawling, Jr., in the chair. Present, :22 members and visitors. A paper entitled, " O n the Design of Direct-Current Dynamo-Electric Machines," by Mr. Cecil P. Poole, of N e w York, was read by title and was ordered to be printed and circulated in advance of the next meeting for discussion. Dr. E. F. Roeber addressed the meeting on " Electrical Dissociation," which was announced as the subject for discussion. The followin~ members participated, viz., Dr. E. Goldsmith, Prof. Amos P. Brown, Messrs. C. J. Reed, Carl Hering and C. H. BedelI. W. PHYSICAl, AND ELECTRICAL
SECTION OF PHOTOGRAPHY AND MICROSCOPY.-- Twenty.third
S!ated W/ced-
ing, held Thursday, May 7, IC~O3. Dr. H e n r y Leffmann in the chair. Present, 49 members and visitors. The first communication of the evening was a description and practical demonstration of the uses of platinum papers, by Mr. John Bradley. In the course of his demonstration the speaker developed a n u m b e r of prints, illustrating the ease with which papers of this kind may be handled. Dr. H e n r y Leffmann followed with a communication on " A Bacterial L a m p , " which was an interesting abstract from a paper of Herr Malisch in a recent impression of the Oeslerreichische Chemiker Zeitung. Mr. J. W. Ridpath exhibited a number of miscellaneous lantern photographs of subjects of local interest. M. I. WILBERT,
Secretary. MINING AND 1V[ETALLURGICALSEcTioN.---Stated IFleeting, Thursday, May I4, 19o3. Mr. J o h n Birkinbine in the chair. Present, 62 members and visitors. t h e paper of the evening was presented by Mr. Charles Kirchhoff, Editor of the h o n Age, New York. Subject: " The Utilization of Blast Furnace Gases for the Generation of Power." The paper was fully illustrated by means of lantern photographs, and will appear in the Journal with discussion. Wx. H. WAHL, •
l
Secretary pro tern.
Sections.
[J. F. I.
Mr. U. C. W a n n e r presented a communication on " Some E x p e r i m e n t s in Stand or Tank Development," which was illustrated by the exhibition of a number of negatives and prints made from negatives developed in tanks with dilute developer. Mr. Martin I. Wilbert addressed the meeting on " T h e Use of Lantern Slides as an Aid in Object Teaching." The speaker illustrated the subject by shovcing a number of slides (loaned by Prof. Jos. P. Remington) exhibiting botanic and pharmacologic objects colored by students of the St. Louis College o f Pharmacy. Mr. Howard W. DuBois exhibited a number of artistically colored slides and made some remarks on the method of col.oring. Dr. Leffmann exhibited a number of shdes representing typical desert vegetation. M. I. WILBERT,
Secretary.
SEcTio~cs.--3/Zeeling, Thursday,
April 23d. Mr, Jesse Pawling, Jr., in the chair. Present, :22 members and visitors. A paper entitled, " O n the Design of Direct-Current Dynamo-Electric Machines," by Mr. Cecil P. Poole, of N e w York, was read by title and was ordered to be printed and circulated in advance of the next meeting for discussion. Dr. E. F. Roeber addressed the meeting on " Electrical Dissociation," which was announced as the subject for discussion. The followin~ members participated, viz., Dr. E. Goldsmith, Prof. Amos P. Brown, Messrs. C. J. Reed, Carl Hering and C. H. BedelI. W. PHYSICAl, AND ELECTRICAL
SECTION OF PHOTOGRAPHY AND MICROSCOPY.-- Twenty.third
S!ated W/ced-
ing, held Thursday, May 7, IC~O3. Dr. H e n r y Leffmann in the chair. Present, 49 members and visitors. The first communication of the evening was a description and practical demonstration of the uses of platinum papers, by Mr. John Bradley. In the course of his demonstration the speaker developed a n u m b e r of prints, illustrating the ease with which papers of this kind may be handled. Dr. H e n r y Leffmann followed with a communication on " A Bacterial L a m p , " which was an interesting abstract from a paper of Herr Malisch in a recent impression of the Oeslerreichische Chemiker Zeitung. Mr. J. W. Ridpath exhibited a number of miscellaneous lantern photographs of subjects of local interest. M. I. WILBERT,
Secretary. MINING AND 1V[ETALLURGICALSEcTioN.---Stated IFleeting, Thursday, May I4, 19o3. Mr. J o h n Birkinbine in the chair. Present, 62 members and visitors. t h e paper of the evening was presented by Mr. Charles Kirchhoff, Editor of the h o n Age, New York. Subject: " The Utilization of Blast Furnace Gases for the Generation of Power." The paper was fully illustrated by means of lantern photographs, and will appear in the Journal with discussion. Wx. H. WAHL, •
l
Secretary pro tern.