US$ 24.95
3' Not signed
Clere Parsons standing and Charles Algernon Parsons seated on the platform rail near two male observers
Disraeli (now elevated to the Lords as Lord Beaconsfield)
yellow and blue spectra with curves of maximum intensity (figures 1-3) and their combination into a solar spectrum (figures 4-5)
16th May 1989
Groundhog in Hollow Log NTS_BTN_5_97_2B.tif 3' Not signed