ROLLED GLASS BY MISSISSIPPI

foreign [Music] foreign [Music] from the first natural glass found millions of years ago to the varied output of the glassmaker's Furnace today is The Saga of glass [Music] of the three members of the flat blast family plate glass window glass and roll glass we are concerned with roll glass sometimes rough sometimes smooth mostly translucent rather than transparent glass with a job to do the primary function of low glass diffusion decoration protection and heat absorption to fulfill these many needs a wide variety of glass has been designed and engineered [Music] foreign [Music] [Music] foreign [Music] thank you [Music] foreign [Music] glass to admit light to the interior of the room as well as offering privacy has led to its use in many modern offices and homes with the many patterns now available the decorative possibilities are Unlimited as glass emerges from the spout of this furnace it is molten enough to flow but in a matter of inches it's pulled through embossing rollers that make their mark on this glass to add specific functions to all its other characteristics it is non-combustible it cannot burn since it was born in a furnace after slow cooling it emerges from the layer permanently rigid hard and unaffected by time or by exposure to the elements foreign is further treated to add even more functions to its design and shape glare reduction and additional obscurity can be accomplished by acid etching if transparency is desired along with protection as in the case of some fire retardant panels the glass is Polished in these polishing Mills and the glass emerges with all the luster of fine plate glass foreign [Music] Mississippi glass is manufactured in the modern factories such as this one in St Louis other factories are located at floreth Pennsylvania and Fullerton California [Music] in this experimental School building built by Mississippi glass continuing research on daylighting is carried out the building is oriented to the four cardinal points of the compass with movable partitions inside thus a great variety of field conditions can be set up and by changing the fenestration precise investigations can be accomplished here in miniature but scientifically accurate we can duplicate lighting conditions in a typical room with clear glass and our standardized amount of light in a given elevation we can show the effect of various figured patterns [Music] this particular sample has been glare reduced on the pattern side this glass has a light transmittance of some 15 percent less than the untreated sample or a total of about 74 percent [Music] we normally recommend glazing the glare reduced surface toward the interior of the building so that it will be less susceptible to dirt and even more accessible for cleaning [Music] [Music] hmm [Music] foreign here in life-size scale we'd like to show the results of glazing this experimental School room with different glasses with time lapse photography we're about to see a comparison between pedicore glare reduced on the bottom half of the screen and clear glass on the top these pictures were taken one frame every 20 seconds from sunrise to sunset with full sunlight all day you will notice that a vision strip has been retained in the room glazed with pedicore to avoid any possible feeling of claustrophobia as is recommended in this type of installation [Music] foreign [Music] foreign [Music] [Music] foreign [Music] [Music] experiment repeated only luxide coolite has been placed in the frames instead of pentacore [Music] foreign [Music] foreign [Music] to give a better understanding of what we have just seen we will show the spectral energy curve of sunlight it extends from wavelengths as short as 219 millimicrons to 2100 millimicrons from about 290 millimicrons to about 380 is the ultraviolet band visible light extends up to 760 millimicrons and in the rest of the band is infrared or heat producing waves to reproduce this in the laboratory exactly is almost impossible by taking an incandescent lamp we get a curve like this by adding a filter between the light bulb and our measuring device we get a fairly accurate resultant as seen here this instrument is a radiometer the speed at which it revolves is a visual indication of the amount of heat that is being transmitted to it you will notice that the speed of the meter to unfiltered light is considerably slowed when the filter is added this is caused by the removal of the high energy emission of the light bulb that is greater than is found in normal sunlight Now 1 8 inch Flint clear glass is added to the path of the light and there will be noticeable slowing down due to the transmission loss however slight now we replace the clear glass with cool light and the meter slows almost to a standstill showing the effect of the cool light heat absorbing glass now let's translate this information into terms of heat transmission into a building with clear glass in the fenestration we see one hundred percent arriving at the window of this nine and six tenths percent is reflected as the glass absorbs some of the Heat and comes up to temperature it re-radiates some of this heat two and eight tenths percent goes back outside and a like amount goes into the building 84 and eight tenths percent is transmitted directly thus 12 and four tenths percent is excluded from the building and 87 and six tenths percent enters through this 1 8 inch Flint class by substituting 1 8 inch coolite we again see 100 arriving at the window with the same nine and six tenths percent reflected from the surface of the glass the cool light absorbs and re-radiates a much larger amount of the Heat and 29 and two tenths percent is re-radiated both inside and out but only 32 percent is transmitted thus 38 and 8 10 percent is excluded from the building and 61 and two tenths percent enters by increasing the thickness of the cool light 35 and two tenths percent is re-radiated and only 20 percent transmitted so that 44 and a tenths percent is excluded and the 55 and two tenths percent enters the building the use of cool light in an air-conditioned building will reduce the load on the air conditioning equipment due to the fenestration by approximately one-half technical information on all the glasses currently manufactured is available from Mississippi glass Representatives schools have changed considerably over the past few years and glass is playing a big important role in these changes whether it's a small rural school or a big city high school you'll find glass playing a big role in the average classroom as well as in the specialized teaching rooms such as the sewing and home economics room and the shops [Music] when this boy graduates and goes out into industry he will find that the leading industrialists realize that good daylighting pays off in the design of their new buildings or the remodeling of older buildings the properties of light diffusion and glare reduction from the popper glasses can result in rooms being properly daylighted far from Windows with small Skylight areas covering large floor areas with shadowless illumination eliminating eye strain on the part of the workers this results in Greater productive effort and less cost here are some typical glass patterns available for industrial and school use [Music] [Music] foreign [Music] foreign [Music] foreign [Music] [Music] no matter where it occurs fire is a serious thing since wired glass was introduced over 60 years ago it has saved countless millions of dollars worth of property and many many lives wired glass has probably done more to prevent the spread of fire than any other single material over the years wired glass has proved itself as a fire retardant to such an extent that the Underwriters Laboratory no longer find it necessary to test it however it is mandatory that wired glass be used in fire doors and windows by means of this graph we see that in order to complete the test the Sash and glass are tested in an oven that gradually raises the temperature until at 45 minutes the internal temperature is 1640 degrees well above the melting point of aluminum this is the underwriter's official film of the fire test of a unit designed and constructed by the overly manufacturing company the test assembly consists of a pair of hollow metal doors a steel frame a four foot high transom and side lights six inches wide on the left and 30 inches wide on the right the overall size of the test model was determined by the size limitations of the Furnace in order to obtain the widest possible side lights only four units were used which also permitted the testing of unequal stresses of the frame the unusual arrangement of both horizontal and vertical mullion bars is to determine the difference in deflection in regards to a position the assembly has been mounted in a masonry wall and placed in a controlled temperature furnace which will duplicate the conditions of a burning building at this point in the test the doors have been burned considerably and the paint is charred as is the mullion of the transom in spite of the cracked glass and the obvious deflection in the doors and Frames the unit is very efficiently doing the job it was designed to do at the end of the successful 60-minute test the entire unit still intact in the masonry wall is taken from the furnace for the hose stream test under the test requirements a stream of water with pressure of 30 pounds per square inch will be applied for 71 seconds a figure based on an underwriter Labs formula which relates the area of the unit to the length of the test the partial dislodging of the glass in the lower left light of the glass door and the two Lower Lights of the sidelight is from the tremendous hose stream pressure this breakage is allowable and expected and as long as the entire glass unit is not knocked out it in no way detracts from the success of the test nor the use of the assembly as protection against fire and smoke measurements made at the completion of the test showed no difference in the degree of deflection of the horizontal and vertical deflection of the mullion bars it is apparent that their length is the determining Factor rather than the position in which they are placed the assembly used in this test was designed to pass hundreds of students through in normal schools use as well as to ensure passage of a hospital bed with an attendant on either side wired glass is made in two patterns of wire and in a wide variety of surface textures the wire is inserted into the molten glass the resulting glass is completely fused around the wire the introduction of diamond-shaped welded wire netting has removed the objection to the chicken wire appearance of wire glass Mississippi glass developed this new and modern design at the request of the architectural and Engineering professions and it meets the same standards as the woven wire mesh [Music] foreign [Music] glass can be used for decoration as well as for utility and it is being used more and more in the modern homes and buildings of today if you would like to have more detailed technical information on the use of glass in homes schools or factories contact the Mississippi glass company or your local supplier [Music]