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Vintage "Queen & Co" Brass Rolling Parallel Rule
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Vintage "Queen & Co" Brass Rolling Parallel Rule
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This is an a piece of vintage drafting (drawing) equipment. This brass rolling parallel rule was manufactured"Queen & Co." Phila. It is 18" long X 2" wide. (Note: T is one brass screw missing that can be seen in one of the photos.) Queen & Co. has a long history: James W. Queen & Co.From the Scientific American , April 28, 1888 Thirty-five years ago, Mr James W. Queen, a gentleman of scientific attainments and great business ability, began in the city of Philadelphia a small business in optical and philosophical apparatus. In 1859 he associated with Mr. Samuel L. Fox, and under their personal supervision and management, the business steadily developed and quickly outstripped similar establishments. In the year 1870 Mr James W. Queen withdrew, and Mr. S.L. Fox continued and still continues the business under the old title of James W. Queen & Co. Different branches were gradually added until the business became the largest and most comprehensive of its kind in the United States or in the world. The progress and development of this business is, without doubt, a fair index of the scientific progress of this country. In time the business became so large that it was found necessary to arrange the different branches under different departments, with a competent man at the head of each department.T are at present six departments, arranged under the following heads: physical and chemical, engineering, ophthalmic, microscopical, the magic lantern department, and the photographic department. The headquarters of these departments are at 924 Chestnut Street, Philadelphia, at the site occupied originally by Mr. Queen. But, the business having enormously outgrown the building, some departments were obliged to seek quarters for apparatus in other buildings in the vicinity of the main offices of the establishment. The factory in which are made a large proportion of the instruments and apparatus sold by Queen & Co. was long ago removed to more commodious quarters, now occupying a floor extending through a city block and fifty-five feet in width. Although the importation of fine instruments for demonstration and for commercial use is a large and important part of the business of the concern, the manufacture of such instruments has reached proportions which can hardly be appreciated without a visit to the shops. One of our illustrations Queen factory , gives a truthful representation of the place win are made scientific instruments in such great variety as to render it impossible for us to even enumerate them. We may, however, mention a few of the leading articles. A great deal of work for the government is done in this place. The apparatus for the Signal Service is largely furnished by Queen & Co. One of the features which first attracts the attention of visitors to the shop is a machine for testing anemometers. A pair of anemometers are attached to a long beam, which is rotated at a known velocity. This is, of course, the equivalent of causing the air to pass the anemometers at the same velocity. By means of the rotating beam the instruments are carried through the air at different velocities, ranging from a fraction of a mile per hour up to the velocity of a cyclone, and the instruments are adjusted to accurately indicate and record the velocity. The thermometers and barometers used by the government are made An order from the government for a large number of microscopes of special design for testing certain adulterations of food has recently been completed. The microscopes of the various "Acme" patterns are made , these being finished up in lots of from 25 to 50 of a kind; many of the parts are made up by hundreds at a time. As the best drawn steel pinions to be found in the market have proved to be of insufficient exactness to make a perfect rack and pinion movement, all the pinions and racks used in the manufacture of microscopes are cut by fine machinery specially adapted to this work. To secure perfect smoothness in motion, each rack and pinion is "ground in". T... 
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