Rare 1902 , Antique Tycos Lloyd’s hygrodeik Thermometer barometer Hygrometer. Very Rare & Hard To Find! Great Condition & Working!! 7.8″ x 3.25″ (base), 10.1 height. The thermometer on the left measures the wet bulb temperature while the one on the right measures the dry bulb temperature. To read the instrument, you enter the psychrometric chart in the middle at the mercury levels in the two thermometers and move the stylus to be above the point of intersection of the two curves. The relative humidity is then read on the bottom scale under the stylus. The dew point temperature can also be read. Though primarily a laboratory instrument, the 1933 Welch catalog indicates that this model was used by the US Weather Bureau for rapid relative humidity determination. The item is guaranteed as working at time of dispatch and as shown in the pictures unless specified otherwise. I try to take the best photos that I can. Please feel free to view my other items I have listed!! The item “Rare 1902, Antique Tycos Lloyd’s hygrodeik Thermometer barometer Hygrometer” is in sale since Monday, August 07, 2017. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “tritonofthesea” and is located in Lancaster, Pennsylvania. This item can be shipped to United States.
