The British dealt with range measurement first, when it was realised that range was the key to producing a better fuse setting. This led to the Height/Range Finder (HRF), the first model being the Barr & Stroud UB2, a 2-metre optical coincident rangefinder mounted on a tripod. It measured the distance to the target and the elevation angle, which together gave the height of the aircraft. These were complex instruments and various other methods were also used. The HRF was soon joined by the Height/Fuse Indicator (HFI), this was marked with elevation angles and height lines overlaid with fuse length curves, using the height reported by the HRF operator, the necessary fuse length could be read off.
The fuse length could be set using height reported by whom?
HRF operator

In the last two decades, photovoltaics (PV), also known as solar PV, has evolved from a pure niche market of small scale applications towards becoming a mainstream electricity source. A solar cell is a device that converts light directly into electricity using the photoelectric effect. The first solar cell was constructed by Charles Fritts in the 1880s. In 1931 a German engineer, Dr Bruno Lange, developed a photo cell using silver selenide in place of copper oxide. Although the prototype selenium cells converted less than 1% of incident light into electricity, both Ernst Werner von Siemens and James Clerk Maxwell recognized the importance of this discovery. Following the work of Russell Ohl in the 1940s, researchers Gerald Pearson, Calvin Fuller and Daryl Chapin created the crystalline silicon solar cell in 1954. These early solar cells cost 286 USD/watt and reached efficiencies of 4.5–6%. By 2012 available efficiencies exceed 20% and the maximum efficiency of research photovoltaics is over 40%.
Who created the crystalline silicon solar cell?
Gerald Pearson, Calvin Fuller and Daryl Chapin

Hokkien has one of the most diverse phoneme inventories among Chinese varieties, with more consonants than Standard Mandarin or Cantonese. Vowels are more-or-less similar to that of Standard Mandarin. Hokkien varieties retain many pronunciations that are no longer found in other Chinese varieties. These include the retention of the /t/ initial, which is now /tʂ/ (Pinyin 'zh') in Mandarin (e.g. 'bamboo' 竹 is tik, but zhú in Mandarin), having disappeared before the 6th century in other Chinese varieties.
What Chinese dialect has more consonants than standard Mandarin or Cantonese?
Hokkien