45, COBNHILL, E.G., AND 122, REGENT STREET, W., LONDON. 59 



The Charts are printed upon sensitized paper, ruled with vertical lines, 

 representing the hours and minutes of the day; they are supplied, ready 

 for use, in boxes containing 100 each. The records obtained are rendered 

 permanent by simply washing the papers for a few minutes in cold water and 

 afterwards drying them between blotting-paper. 



INSTRUCTIONS FOR FIXING- JORDAN'S SUNSHINE RECORDER. 



77. Select a suitable position which has the full range of the sun at all 

 seasons of the year. Provide affirm support with a perfectly level top, place the 

 Instrument upon it (the lid of the cylinder facing north), and when the sun is 

 on the meridian (12 o'clock) turn the instrument on its base until the shadow 

 of the pin on the lid of the cylinder coincides with the vertical line on the 

 white glass behind it. When this adjustment has been correctly made, the 

 instrument may be permanently screwed down to its support, then incline the 

 cylinder on its horizontal axis, by means of the milled head at the side, until 

 the point of the shadow of the aforesaid pin falls on the point of intersection 

 of the two lines, and clamp securely by means of the opposite milled head, the 

 ray of sunlight passing through the central aperture will then fall on the 

 twelve o'clock division of the chart. This adjustment will require to be altered 

 occasionally as the seasons vary, the necessity for alteration being shown by 

 the position of the trace above or below the central line of hour divisions on the 

 hart. 



The charts should be inserted in the cylinder each day after sunset, ready 

 for the following day, the ends being placed against the stops provided for the 

 purpose. On removing the charts from the instrument after the day's observa- 

 tion the number of hours recorded should at once* be tafadated, the trace may 

 then be rendered permanent by immersing the chart for a few minutes in cold 

 water, until the surface becomes white and the trace a bright blue colour ; it 

 should then be removed and dried between blotting paper. Care must be taken 

 not to expose the sensitized charts to the daylight longer than is necessary for 

 removing and inserting them in the cylinder. The cylinder being held in 

 position on the frame by a clamping screw can be easily removed for the purpose 

 of changing the chart, which may be done either at the place of observation or 

 indoors 



* This precaution is necessary that any very faint traces on the chart may not be lost 

 before registering, by too long immersion in water, or it may be advisable to mark with a 

 pencil the limits of the trace before placing in water. 



