- The"" Pistol Flash meter"" had a tape of the same size as that of Johnson, but the"" Flashmeter"" tape was slightly narrower, perhaps 2.5 mm. - The support is held by hand, a tape was removed and then ignited with a match or lighter. - Only burn exposed tape (with a beautiful blanca'actínica light '), so it was `safe' hold. - Project the tape rotating the disk with the thumb and finger to the desired length. - With the scale you can measure the correct length of the band, which ensures uniformity of exposure when multiple exposures are made to light or gas lantern slides. - For a continuous recording, the tape can be projected slowly rotating disk. - From what I can ascertain, this iwa was done in the early 1900s. - The dimensions of the box are 14 cm long and 6.5 cm wide. - A beautiful piece collection - The pistol is still very nice, considering the age. - Despite the size, I think it is wise to send it as a package [to package it well] and not in an envelope with bubble wrap, but if you want it done otherwise, please let me know and I will refund expenses Shipping.