You might have wanted to talk to Bill Lull about circular charts before youn committed. According to MOH Library: > > At 08:25 AM 2/14/96 EST, you wrote: > >I am trying to purchase a recording hygrothermograph for monitoring > >in a newly restored 1904 building. Does anyone have any strong > >recommendations for brands and/or suppliers. Is Belfort in Baltimore > >still in favor? Any tips or things to watch out for? > > > > > At the new Museum of History in Raleigh, we use Hygrothermographs by Omega > Engineering.They are a very slim unit with circular charts that are easier > to change than the old drum type.The unit measures 13.5" high x 10.5" wide > x2.5" deep. > Colour is beige and they blend into exhibit decor very nicely.These have > digital motors instead of analogue and draw less volts for economy of > operation.They operate best on two Duracell batteries for several months and > are shipped with a/c adapters. > There are two lights to the right of the dial face,(operate only on DC)very > handy when changing charts in a dimly lighted gallery full of visitors.To > the lower right hand corner is a digital display to check gallery climate at > any instance. > An audible alarm is incorporated in the design,it's use optional should the > batteries weaken. > The charts are round and two sided and so there is a cost saving in flipping > charts and it reduces filing space required.They are packed with a small > quantity of charts in C and F degrees,daily,weekly and monthly.I found > weekly to suit my purpose and so I suggest if you order a unit to ask on the > order for all charts packed to be what you require.The others will just > gather shelf dust. > The customer service by Omega is excellent.Cost is appx $535.00ea.I have 17 > units in operation. > > Omega Engineering > One Omega Drive,Box4047 > Stamford,CT 06907-0047 > Telephone (203)359-1660 (800-826-6342 Sales and Service) > FAX (203)359-7700 > > I have also had experience with the old German made, key wind-up drum > units.These are workhorses and sometimes may be found for resale at > instrument repair shops or talk to a horologist.They seem to last forever > and aren't subject to power failure. > Be sure to have it recalibrated if it hasn't a tag indicating so. > Cole- Palmer sells a miniature drum type that operates for months on one AA > size battery. > If you have visitors in the gallery you may ask your mount makers to > fabricate lexan shelves to keep them out of reach of curious children. > Our security staff found a child lying on the floor in a galley speaking > into the relative humidity sensor thinking it was a tape recorder.The father > was quite irate when the guard asked that he replace it on the shelf.Such > are the joys of museum life! > Regards > Len Hambleton-Chief Conservator > The North Carolina Museum of History > Raleigh,NC [log in to unmask] >