photoheliographs

Under his direction, Mr Dallmeyer has advanced far in the preparation of five photoheliographs ....

Autobiography Airy, George Biddell, Sir 1896

There will thus be available for observation of the Transit of Venus 23 telescopes, nine of which will be provided with double-image-micrometers; and five photoheliographs; and for determination of local time, and latitude and longitude, there will be nine transits and six altazimuths ....

Autobiography Airy, George Biddell, Sir 1896

Originally five stations were selected and fully equipped with equatoreals, transits, altazimuths, photoheliographs, and clocks; but I have since thought it desirable to supplement these by two branch stations in the Sandwich Islands and one in Kerguelen's Island; and the additional instruments thus required have been borrowed from various sources, so that there is now an abundant supply of instrumental means ....

Autobiography Airy, George Biddell, Sir 1896

With regard to the photoheliographs it is proposed to make trial of a plan proposed by M. Janssen, for numerous photographs of Venus when very near to the Sun's limb.

Autobiography Airy, George Biddell, Sir 1896

Historical records from days when the observatory kept time for the city and glass-encased photoheliographs, used to photograph the sun, are glimpses into the past, when what was written in the stars affected everyday life.

unknown title 2009

A Janssen slide, capable of taking 50 photographs of Venus and the neighbouring part of the Sun's limb at intervals of one second, has been made by Mr Dallmeyer for each of the five photoheliographs.” ”

Autobiography Airy, George Biddell, Sir 1896