American
Artifacts
Catalog

scientific
instruments

Medical
Instruments

tools and
technology

farm tools

calculators
and slide rules

household
and office

American Artifacts
Site Contentsonline articles online catalog

Dr Draper's Hygrograph

A recording hair hygrometer. Cast in the iron front plate is "Draper's Self-Recording Hygrometer, Pat Appld For, The Draper Mfg Co., NY". The instrument is 20" high, with an 11" chart recording 7 days and 0 to 100 pct humidity. Perforated copper sides are provided for air circulation. The recorder can be either placed on a table or hung on the wall.

The multiple strands of hair need to be replaced. The hair present appears to be horsehair, but human hair may have been used originally. The length of hair required is about 18" to 20". Also, the seven day key wind clock does not run continuously. The flat glass in the copper door is missing, but better replaced after the UPS shipping. One used chart is included.

the cast iron front plate

the mechanism, showing the counterweight, adjustment screws, and method of hair attachment

Price: $100 plus UPS
Items reserved by email will be held 10 days and shipped upon receipt of your check. Please wait to mail your check until you receive email confirmation of your reservation.

Contact: Richard Van Vleck - Email: richard@americanartifacts.com

© 2006, American Artifacts, Taneytown, Maryland.