UK, 1900: Battery Platinum

Mid-1899/1900: 1 Troy Ounce platina (Ore, at 83%) = £ 3.11 (USD$ 15.11)
Mid-1899/1900: 1 Ozt. Pt (Ore, @ .999) = £ 3.747 (USD$ 18.235)
  
1900: 1 Ozt. Platinum (Ore, at 83%) = £ 3.1563 (USD$ 15.36)
1900: 1 Ozt. Pt (Ore, @ .999) = £ 3.8028 (USD$ 18.506)

1900: 1 Ozt. Platinun (Sheet, .999) = £ 3.75 (USD$ 18.25)
 1900: 1 Ozt. Platinum (Mfg) = £ 3.85 (USD$ 18.74)

Citation: The Platinum Metals, Arthur Douglas Lumb (1920) p.13

Citation: The Mineral Industry, Vol. 9 1900 (1901) p.519

1899/1900:

Smee's & Grove's Batteries:

 

1900: "an excellent and superior instrument is Daniell's pyrometer, for indicating high temperatures, price £5 5s."

1900: 1 Ozt. Gold (Bid: 18k) ~ £ 2.88 - 2.959 (USD$ 14.40)
1900: 1 Ozt. Dental Gold (Trade: 18ct Plate) = £ 3.60 (USD$ 17.52)

c.December 1900: 
Citation: British Journal of Dental Science, Vol. 44 Feb. 1901 p.174





Tasmanian Iridosmine, c. June 1900:





October 1900:


December 1900: 
December 1900: 1 Ozt. Platinum (London Mkt: Sheet, .999) = £ 3.75 (USD$ ) 
 
Citation: Engineering and Mining Journal, p.152 (Vol. 71 (1/5/1901)