Accession No

6754


Brief Description

six sunshine recorder cards (No. 6730 & 6731), by Casella Ltd., English, pre-2000


Origin

England


Maker

Casella Ltd.


Class

astronomy


Earliest Date

2000


Latest Date

2000


Inscription Date


Material

paper; ink


Dimensions

(No. 6730) length 312mm, width 32mm; (No. 6731) length 265mm, 32mm


Special Collection


Provenance

uncertain


Inscription

[No. 6730]
'To be used between 15th Oct. & 28th or 29th Feb. in SOUTHERN HEMISPHERE.'
'To be used between 12th April & 2nd Sept in NORTHERN HEMISPHERE.'
'Cut off for lat. ≤25°' on both ends.
[No. 6731]
'To be used between 12th April & 2nd Sept in SOUTHERN HEMISPHERE.'
'To be used between 15th Oct. & 28th or 29th Feb. in NORTHERN HEMISPHERE.'
'CUT OFF FOR LAT. ≥40°' on both ends.


Description Notes

Six sunshine recorder cards (No. 6730 & 6731), by Casella Ltd., English, pre-2000.

The cards are intact, without any sign of use. No. 6730 has three copies, longer, with instructions 'To be used between 15th Oct. & 28th or 29th Feb. in SOUTHERN HEMISPHERE.' and 'To be used between 12th April & 2nd Sept in NORTHERN HEMISPHERE.', and also with 'Cut off for lat. ≤25°' on both ends. No. 6731 has three copies, shorter, with instructions 'To be used between 12th April & 2nd Sept in SOUTHERN HEMISPHERE.' and 'To be used between 15th Oct. & 28th or 29th Feb. in NORTHERN HEMISPHERE.', and also with 'CUT OFF FOR LAT. ≥40°' on both ends.


References


Events

Description
Sunshine recorder cards are used with a sunshine recorder to monitor the duration of bright sunlight throughout the summer time. A sunshine recorder is an instrument with a glass ball that receives sunlight. With the recorder card placed underneath, the sunlight focuses and burns marks on the card. By observing the burnt marks, the strength and duration of sunlight can be understood.
19/08/2022
Created by: Guey-Mei Hsu on 19/08/2022


FM:47542

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