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Photos of Engine Hall:

• Typewriter (Oliver): Made in Chicago, USA.



• Sewing machine: Development of Sewing machines: The first patent for a sewing machine was taken out in 1790 by Thomas Saint of London. In 1830 Barthelemy Thimonnier of France developed a chain stitch machine. Elias Howe (1819-1867) of USA patented the first working lock-stitch machine in 1846. The first machine to have a general form of a modern one was developed in 1851 by Isaac M. Singer (1811-1876) a German-American. The foot operated treadle was incorporated during this time.



• Mechanical Calculator: Development of Mechanical Calculators: The earliest form of calculating device known to man is the Abacus. It was probably invented in Babylonia about 5000 years ago and is still used in different parts of the world. In 1967, John Napier, a Scottish mathematician invented Napier’s rods- a calculating device. It was the French mathematician and philosopher, Blaise Pascal, who in 1642 built the first adding and subtracting machine. The next stage that of a machine which would also multiply and divide was developed in 1694 by the German mathematician Gottfried Wilhelm Von Leibnitz. Charles Babbage (1792-1871) of Britain invented the calculating machine which was based on differences. Babbage is mainly notable for introducing the ideas of programming and taping and his ideas were later used in conceiving the computer.



• Music Box of 1816: Musical instruments: Musical instruments produce their sounds by creating vibration sin the air around them. With stringed instruments, for example, the vibrations in the air are created by the vibration of the string as they are plucked, struck, or played with a bow. The pitch of a note is determined by the frequency of these vibrations. Musical instruments themselves can be divided in to several main groups according to their construction.



• Ladders: Once ladders were nothing more than crude notches carved into an upright log but today ladders are available in many different sizes, styles and materials used in making them. The major materials used in making ladders include wood, bamboo, aluminium and fiber glass. Wooden ladders as well as ladders made by using bamboo are sturdy and bend little under their specific loads. Metal ladders last longer as they are not subject to the deteoration of the wood and also these ladders are comparatively tight. Fiber glass is often used to make the side rails of high grade metal step ladders and straight extension ladders. The result is a nonconductive ladder that is light, corrosion resistant, serviceable and practically maintenance free. Use of such ladders is generally restricted to the industry as these are expensive. Ladders are generally available in 2 different categories:
  1. Step ladder (mainly for indoor use) and
  2. Straight ladder or extension ladder (mainly for outdoor use)

The step ladder is a self supporting portable ladder and not adjusting in length and with flat steps. The extension ladder is simply a straight ladder which is adjustable in height. It consists of two or more straight sections traveling in guides or brackets so as to permit length adjustment. This is a self supporting adjustable telescope as well as portable Aluminum ladder used mainly for various works at Engine hall.



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