Page:Popular Science Monthly Volume 91.djvu/345

 Popular Science Monthly

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���Above: The two hundred sound-proof rooms were finished in five days by using a quickly- appl'ed, ready-to-put-up composition board

At right: Putting up the sound-proof board material. Standard lengths were used and practically unskilled workmen employed

��Two Hundred Sound-Proof Rooms and How They Were Built in Record Time

WITH only five working days in which to erect two hundred sound-proof rooms in the large Coliseum in Chicago, the management of the National Music Show was confronted with an extraordinary problem. The difficulty was made all the greater by the impossibility of getting a sufficient force of workmen on account of the unusual war demands. The problem was solved by the use of a composition board material which proved highly efficient in deadening sound. In fact, although the walls were very thin, as is shown in the photographs, no sound of the numerous musical instru- ments or of voices penetrated from one room to the next. The rooms also made a very handsome appearance. The auditorium built for concerts

���had much the appearance of a real audi- torium built to stay.

The rapid construction work was made possible by the lightness of the material, and the fact that comparatively unskilled workers could put it in place.

A Paper-Disk Flipper for the Youthful "Cut-Up/'

GI RLS and boys alike derive endless amusement from a new device which throws a paper disk larger than a "\ silver dollar from a hundred, to a hundred and fifty feet into the air. The device is very simple in its opera- tion, but flips the disks to a surprising height. You simply hold it in your right hand, with the thumb on the trigger member in the position shown in the illustration, then remove the thumb suddenly, and up or out the disk shoots.

��By removing the thumb suddenly from the trigger the disk is shot up into the air or out, as desired

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