Rare and authentic Lambrecht's Polymeter / hygrometer. 24cm long and 8cm face diameter. Dated around 1900 - 1910 and as seen in the 1910 Lambrecht catalogue. Good used and original condition, with some superficial tarnishing, discolouration and marks. Appears in a working condition, but the hair needs some attention and re-threading / attaching.A hygrometer measures the amount of humidity in the air. The atmosphere always carries a certain amount of water vapour, the proportion of which varies with temperature. The warmer the air the more moisture it will contain. As air becomes colder the water vapour in it condenses into moisture to produce dew or frost. In a mist or fog the air is completely saturated and this is called 100% humidity.
Hair element runs the length of instrument. Dial with bevelled glass, displays dew point calculations.A Combination of Hair Hygrometer and Mercury Thermometer. This hygrometer-thermometer instrument combination allows the reading of relative and absolute humidity, temperature, dew point temperature, saturation pressure and partial pressure of the water vapor. Made by Wilhelm Lambrecht of Germany. Wilhelm Lambrecht started making measuring instruments in Einbeck in 1859. In 1864 he opened a factory in Goettingen.
He developed a hair hygrometer sometime around 1867. In 1873 he started building meteorological instruments such as psychrometers and polymeters. Lambrecht KG' after 1923 and'Wilh Lambrecht GmbH' after 1980. This item is in the category "Antiques\Science/Medicine\Scientific Instruments". The seller is "andrew_frost7r3b" and is located in this country: GB.This item can be shipped to United Kingdom, Antigua and Barbuda, Austria, Belgium, Bulgaria, Croatia, Republic of, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, United States, Bahrain, Canada, Brazil, Japan, New Zealand, China, Israel, Hong Kong, Norway, Indonesia, Malaysia, Mexico, Singapore, Korea, South, Switzerland, Taiwan, Thailand, Bangladesh, Belize, Bermuda, Bolivia, Barbados, Brunei Darussalam, Cayman Islands, Dominica, Ecuador, Egypt, Guernsey, Gibraltar, Guadeloupe, Grenada, French Guiana, Iceland, Jersey, Jordan, Cambodia, Saint Kitts-Nevis, Saint Lucia, Liechtenstein, Sri Lanka, Macau, Monaco, Maldives, Montserrat, Martinique, Nicaragua, Oman, Pakistan, Peru, Paraguay, Reunion, Turks and Caicos Islands, Aruba, Saudi Arabia, South Africa, United Arab Emirates, Chile, Bahamas, Colombia, Costa Rica, Guatemala, Honduras, Jamaica, Kuwait, Panama, Philippines, Qatar, Trinidad and Tobago, Uruguay, Vietnam.