Tilting Bucket Rain Gauge
"Tilting Bucket" Recording Rain Gauge has a glass case with a copper frame on a brass base. Records rain fall in increments of 1/100 inches. The rain is led to a bucket with open ends, divided into two compartments, and pivoted about its central point; it tilts over when .01 inches of rainfall has been collected. An escapement advances a toothed wheel to which is attached a profile cam; resting on this cam is a brass roller attached to the pen arm, which is thus raised step by step for each .01 inch of rainfall up to 1 inch; the roller then trips of the cam and the pen returns to the zero of the chart; an oil filled dashpot dumps the fall. Attached to the escapement wheel is a dial graduated to 2 inches in sub divisions of .01 inches.
Negretti and Zambra (active 1850 – c. 1985) was a company that produced scientific and optical instruments and also operated a photographic studio based in London.
Negretti and Zambra was formed when Henry Negretti (1818–1879) and Joseph Zambra (1822–1897) formed a partnership in 1850. Negretti and Zambra were subsequently appointed opticians and scientific instrument makers to Her Majesty Queen Victoria, Prince Albert and King Edward VII, the Royal Observatory and the British Admiralty. They were pioneers in the world of photography and were credited with the first ever aeriel photographs of London which were taken from a hot air balloon.
In 1985 Negretti and Zambra was purchased by the avionics company Meggitt.
Details
Details
NEGRETTI & ZAMBRA
TRADE MARK
NO. M/1124
LONDON
United Kingdom
