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Jason Clarke Antiques
Tel07815 046645Please quote Antiques Atlas.
Art Nouveau Barometer Inlaid Hearts
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Large Aneroid Wheel Barometer
Antique Victorian Black Forest aneroid barometer
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Humidity Reader or Hygrometer by Negretti & Zambra
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Early twentieth century humidity reader by Negretti & Zambra
Properly named in their 1950 catalogue as a hair hygrometer or hygroscope, this instrument was used to measure relative humidity in the air with a range of 10-100% humidity.
To quote the Negretti & Zambra catalogue, “The hair hygrometer or hygroscope range 0/100% relative humidity consists of a bundle of hairs or other organic tissue which changes in length when it absorbs moisture.
There are no springs, gears or cords in the mechanism, and errors due to backlash, friction etc, are thus reduced to a minimum.
The hygroscope can be readily checked from time to time, either by wetting the element with a camel hair brush, in which case it should be read approximately 95%: or better still, by means of the wet and dry bulb whirling hygrometer.”
Negretti & Zambra retailed two version of this instrument. This particular version was dubbed the “PH/1 4 inch dial Pocket Hair Hygrometer (Hygroscope) range 0/100% relative humidity metal case, 4.5 inch diameter overall, finished eggshell black dial enamelled white with black divisions and figures.” How convenient it was as a pocket instrument could be debated but it remains in complete working order and has great design qualities. Manufactured along the same principals as the hygrometers encountered on antique wheel barometers where a reed of barley was used to create a similar outcome, this updated and more accurate version shows the development of the instrument into the twentieth century.
Negretti & Zambra were a leading name in the production of meteorological and scientific instruments and have a company history dating back to 1850. Throughout their long and esteemed history they exhibited at British industrial fairs throughout and became makers to both Queen Victoria and Edward VII. Owing to changes in the business, the firm ceased the public retailing of scientific instruments sometime around the late 1960’s and continued with a focus on the aviation industry in numerous guises until its eventual liquidation in the year 2000. A sad end to a hundred and fifty years of quality manufacturing.
SellerJason Clarke Antiques
View all stock from
Jason Clarke Antiques
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Private dealer
By appointment only
Newbury
Berkshire
Tel : 07815 046645
Non UK callers : +44 7815 046645
Properly named in their 1950 catalogue as a hair hygrometer or hygroscope, this instrument was used to measure relative humidity in the air with a range of 10-100% humidity.
To quote the Negretti & Zambra catalogue, “The hair hygrometer or hygroscope range 0/100% relative humidity consists of a bundle of hairs or other organic tissue which changes in length when it absorbs moisture.
There are no springs, gears or cords in the mechanism, and errors due to backlash, friction etc, are thus reduced to a minimum.
The hygroscope can be readily checked from time to time, either by wetting the element with a camel hair brush, in which case it should be read approximately 95%: or better still, by means of the wet and dry bulb whirling hygrometer.”
Negretti & Zambra retailed two version of this instrument. This particular version was dubbed the “PH/1 4 inch dial Pocket Hair Hygrometer (Hygroscope) range 0/100% relative humidity metal case, 4.5 inch diameter overall, finished eggshell black dial enamelled white with black divisions and figures.” How convenient it was as a pocket instrument could be debated but it remains in complete working order and has great design qualities. Manufactured along the same principals as the hygrometers encountered on antique wheel barometers where a reed of barley was used to create a similar outcome, this updated and more accurate version shows the development of the instrument into the twentieth century.
Negretti & Zambra were a leading name in the production of meteorological and scientific instruments and have a company history dating back to 1850. Throughout their long and esteemed history they exhibited at British industrial fairs throughout and became makers to both Queen Victoria and Edward VII. Owing to changes in the business, the firm ceased the public retailing of scientific instruments sometime around the late 1960’s and continued with a focus on the aviation industry in numerous guises until its eventual liquidation in the year 2000. A sad end to a hundred and fifty years of quality manufacturing.
Price The price has been listed in British Pounds.
Conversion rates as of 27/JUN/2024. Euro & Dollar prices will vary and should only be used as a guide.
Always confirm final price with dealer. Sold
Antique Barometers and Barographs
Period 1950s Antiques
Material Enamel
Origin English
Maker Negretti & Zambra
Item code as542a215 / 401
Status Sold
£0 ![UK](//staticaz.antiquesatlas.com/images/flag_uk.gif)
$0.00 ![USA](//staticaz.antiquesatlas.com/images/flag_us.gif)
€0.00 ![EU](//staticaz.antiquesatlas.com/images/flag_eu.gif)
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$
![USA](http://staticaz.antiquesatlas.com/images/flag_us.gif)
€
![EU](http://staticaz.antiquesatlas.com/images/flag_eu.gif)
Conversion rates as of 27/JUN/2024. Euro & Dollar prices will vary and should only be used as a guide.
Always confirm final price with dealer. Sold
View all stock from
Jason Clarke Antiques
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By appointment only
Newbury
Berkshire
Tel : 07815 046645
Non UK callers : +44 7815 046645
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