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Earth thermometer with bent stem, c. 1925.

1925

Earth thermometer

1985

Earth thermometer

1985

Symons earth thermometer

1880-1889

Symons earth thermometer

1952

Symons earth thermometer

1964

Symons earth thermometer

1966

Alcohol earth thermometer

1986

Temperature tube for Symons pattern soil thermometer

1997

Earth thermometer

1985

Earth thermometer

1985

Earth thermometer

1985

Earth, alcohol thermometer, 1985

1985

Earth thermometer

1985

Mercury earth thermometer, by G H Zeal Ltd, 1985

1985

Earth thermometer, by Max Bossecker, 1943

1943

Bent-stem earth thermometer by C.F. Casella and Co. Ltd, c. 1925.

Bent-stem earth thermometer by C.F. Casella and Co. Ltd

1925

Earth thermometer, centigrade, sheathed, with paper scale, by Max Bossecker, Schmiedefeld a[m] R[heim]. Bulb and short stem bent at slight angle to main tube. Marked B 762/43, 5 Ctm, Jenaer Normalglas 16III, dated 1943. Scale -25 to 45

Earth thermometer

1943

Earth thermometer, maximum and minimum, mercury and alcohol-in-glass, fahrenheit, tube bent 8 inches above bulb. Made by C.F. Casella and Co. Ltd, London. Marked MO 18203, 8974 and NPL25 certified in 1925. Min scale 20 to 125, max scale 15 to 100

Earth thermometer

Earth thermometer, mercury-in-glass, fahrenheit, made by G. H. Zeal Ltd., London. Marked Ref no Met 21417 Mk1C MO 23232/64. Tube through 90 degrees. Dated 1964. Scale 20 to 100

Earth thermometer

1964

Soil thermometers, 10cm - Met Ref 21411, and 20cm - Met Ref 21412, 1997 in two boxes.

Soil thermometers

1997

Earth thermometer, centigrade, sheathed, mercury-in-glass, with paper scale. By Max Bossecker, Schmiedefeld a[M] R[hein]. Bulb and part of stem bent at slight angle from main tube. Marked centigrade.B 1103/44, 10 Ctm., Jena Normalglas 16III. Dated 1944. Scale -21 to 41

Earth thermometer

1944

Earth thermometer, Six's, maximum and minimum, fahrenheit, alcohol and mercury-in-glass, made by G. H. Zeal Ltd., London. Tube bent to form angle less than right angle with Six's thermometr. Marked D.D.B. 9842. Scale 20 to 120. [Date 1950s]

Earth thermometer

Earth thermometer, alcohol and mercury-in-glass, fahrenheit, maximum & minium, Six's type, unsigned but initialled G. H. Zeal Ltd.. Tube bent to less than right angle, with horizontal Six's thermometer. Marked 2148. [Date 1950s]. Scale 20 to 120

Earth thermometer

1950-1959

Earth thermometer, alcohol and mercury-in-glass, fahrenheit, maximum & minimum, Six's type, unsigned but initialled G. H. Zeal Ltd.. Tube bent to less than right angle, with horizontal Six's thermometer. Marked 2147. [Date 1950s]. Scale 20 to 120

Earth thermometer

1950-1959

George James Symons type earth thermometer, with iron tube, by Louis Paschal Casella, 1874

George James Symons type earth thermometer, by Casella, 1874

1874

Modified Symons earth thermometer, by Hicks, with iron tube.

George James Symons type thermometer,

1917

Earth thermometer, maximum and minium, mercury and alcohol-in-glass fahrenheit, by Negretti & Zambra, London. Marked MO 18202, N & Z, NPL25-26. Certified in 1925-26. Scale 20 to 100

Earth thermometer

1925

Earth thermometer, mercury-in-glass, fahrenheit, made by Zeal, England. Marked Met 21416 Mk1B MO 26232/71. Dated 1971. Scale 20-100

Earth thermometer

1971

Earth thermometer, mercury-in-glass, fahrenheit, by Short & Mason Ltd.,, London, England. Tube bent at right angles. Marked 8" immersion, 6249/66. Dated 1966. Scale 20 to 100

Earth thermometer

1966

Earth thermometer, unsheathed, centigrade, made by J. Hicks, 8,9 and 10 Hatton Garden, London, serial no.1335428. Scale 12 to 30. Tube at nearly 90 degrees

Earth thermometer

Earth thermometer, Six's, maximum and minium, mercury and alcohol-in-glass, fahrenheit, made by G. H. Zeal Ltd., England. Tube bent at right angles, with Six's thermometer horizontal. Marked Ref No Met 1614, MO24875/68. Dated 1968. Scale 20 to 120

Earth thermometer

1968

Earth thermometer, mercury-in-glass, fahrenheit, made by Brannan, London. Marked Mk1A MO 21415, MO 24903/68. Dated 1968 earlier, scale 20 to 100

Earth thermometer

Earth thermometer, mercury-in-glass, centigrade. Unsigned. Tube bent at right angles. [ Date 1960s]. Scale 0 to 100

Earth thermometer

1960-1969

Earth thermometer, Six's, maximum and minimum, alcohol and mercury-in-glass, fahrenheit, made by G. H. Zeal Ltd., England. Tube bent at right angles to Six's thermometer. Marked Ref No MET 1607, MO 24833/68. Dated 1968. Scale 20 to 120

Earth thermometer

1968

Earth thermometer, Six's, maximum and minimum, spirit and mercury-in-glass, centigrade, by G. H. Zeal Ltd., England. Marked Ref No 21430, MO 26440/72. Tube bent at near right angle, fixed to horizontal Six's thermometer. Dated 1972. Scale -7 to 38

Earth thermometer

1972